A Review of Countermovement and Squat Jump Testing Methods in the Context of Public Health Examination in Adolescence: Reliability and Feasibility of Current Testing Procedures
- 1Ph.D. Program in Health Promotion and Cognitive Sciences, Department of Psychology, Educational Science and Human Movement, University of Palermo, Palermo, Italy
- 2Department of Exercise and Sport Science, LUNEX International University of Health, Exercise and Sports, Differdange, Luxembourg
- 3Department of Biomedical Sciences, University of Padova, Padua, Italy
- 4CRIAMS-Sport Medicine Centre, University of Pavia, Pavia, Italy
- 5Department of Psychology, Educational Science and Human Movement, University of Palermo, Palermo, Italy
- 6Regional Sport School of CONI Sicilia, Italian National Olympic Committee, Sicilia, Italy
Background: In the context of a public health physical fitness (PF) examination in adolescence, a countermovement jump (CMJ) and a squat jump (SJ) are two vertical jump (VJ) tests widely used to evaluate lower limb muscle strength and power, respectively. The main criticism of both the CMJ and SJ test is the lack of test standardization. Therefore, the objectives of this review are: (a) to gather information about both jumps; (b) to investigate whether it is possible to identify common procedures referred to in the CMJ and SJ technical execution, and (c) to design standard operating procedures (SOPs) to promote CMJ and SJ standardization in an adolescent population aged 12–18 years.
Methods: The review partially adopted the Preferred Reporting Items for Systematic Reviews and Meta-Analyses Statement (PRISMA). Due to growing attention in monitoring physical health through field tests in recent years, articles were collected using the PubMed, Web of Science, and Scopus databases from January 2009 to July 2019. Original articles in which CMJ or SJ were used to assess the muscular strength in adolescents were eligible for further analysis. Articles written in English was imposed as a limit.
Results: A total of 117 studies met the inclusion criteria. The description of the CMJ and SJ test procedures was different within the literature, with discrepancies in the jump technique, number of jumps, and measurement devices used.
Conclusions: A lack of method standardization for both the CMJ and the SJ test was identified. Based on the literature, SOPs for both VJs were proposed. These are useful in the context of public health PF examination in adolescents, as they facilitate an unbiased comparison of jump performance data between published studies.
Muscular strength and power, cardiorespiratory endurance, body composition, and flexibility are health-related attributes of physical fitness (PF) (Caspersen et al., 1985) and consequently are considered key health status markers in humans (Catley and Tomkinson, 2013). To prevent pathologies and diseases that occur during adulthood, monitoring PF during adolescence is, therefore, important (Ortega et al., 2008b). In this context, the identification of children who are not developing healthy fitness habits using valid, reliable but also feasible measurement tools is essential (Davis et al., 2008; Faigenbaum et al., 2011; Garber et al., 2011). In the last decade, several research groups have focused their work on assessing the health status of children and adolescents, developing test batteries such as the ALPHA health-related fitness test battery (Ruiz et al., 2011), the ASSO project (Bianco et al., 2015), and the PREFIT battery (Ortega et al., 2015).
Physical fitness can be objectively and accurately measured through laboratory and field tests (Cooper, 1968; Astrand, 1976; Boone et al., 1978; Leger and Lambert, 1982; Inbar et al., 1996; Mayorga-Vega et al., 2014). Laboratory tests are generally more reliable, while field tests are commonly less expensive and more comfortable to administer (Heyward, 1991), and importantly they are characterized by a high level of ecological validity. Therefore, field tests are more suitable in population-based studies, especially in a school or college setting (Artero et al., 2011). Some field tests are subject to a standardized testing procedure, for example, the Cooper test (Cooper, 1968); the 20-m Shuttle Run Test (Leger and Lambert, 1982), or the sit-and-reach test (Wells and Evelyn, 1952). Conversely, to date the vertical jump (VJ) test does not consist of such standardized testing procedures.
Vertical jumping is a multi-joint movement that requires complex motor coordination, and it has been identified as one of the fundamental movement skills (Gallahue, 2002). VJ tests are widely used to evaluate simple and complex tasks (Suchomel et al., 2016), such as sprint acceleration, sprint deceleration, throwing (Manno, 2008; Comfort et al., 2012a, b; Seitz et al., 2014), and change of direction (Nimphius et al., 2010; Spiteri et al., 2014; Suchomel et al., 2016). Furthermore, to evaluate lower limb muscular strength and due to the simplicity and richness in outcome information, VJ tests are widely used by strength and conditioning professionals, coaches, and health care professionals (Liebermann and Katz, 2003; Duthie, 2006).
The countermovement jump and squat jump (CMJ and SJ, respectively) are two examples of VJs which are both derived from the Sargent jump (Sargent, 1921, 1924). Both CMJ and SJ are considered reliable and valid (Markovic et al., 2004) in children (Fernandez-Santos et al., 2015). The CMJ is characterized by an initial countermovement (CM) before the toe-off phase (Bobbert et al., 1996), and the CMJ provides information about the reactive strength of the lower limbs (Young, 1995). In contrast, the SJ starts from a stationary, semi-squatting position and it provides information about leg power performance (Anderson and Pandy, 1993; Young, 1995). In sedentary individuals, as well as in elite athletes, the resultant jump height is correlated with explosive muscle strength (Sargent, 1921, 1924; Bosco and Komi, 1979, 1980; Bosco and Viitasalo, 1982) and with performance components, such as speed (Wisloff et al., 2004), agility (Barnes et al., 2007), and power (Liebermann and Katz, 2003; Markovic et al., 2004; Patterson and Peterson, 2004; Tricoli et al., 2005). The SJ performance is also considered a measure of coordinated activities (Tomioka et al., 2001; Eloranta, 2003; Myer et al., 2005). In this context, Van Hooren and Zolotarjova (2017) in a recent review highlighted the differences between CMJ and SJ performances, emphasizing the need for future research to investigate the exact interaction of the mechanisms that explain the difference between the two jumps.
The lack of robust and consistent testing methods for CMJ and SJ evident in the literature compromises the quality of the research in this area (Eagles et al., 2015). Eagles et al. (2015) in their meta-analysis on VJ tests stated a lack of standardization in jump phase identification (i.e., starting, push-off, toe-off, and apex of the jump phase) which results in notable differences in the duration of the jump phases, the time to reach peak force, and in the rate of force development. Fitzgerald et al. (2018) suggested the use of the SJ to bypass the problem of the identification of the related phases, as this jump comprises of less variables than other kinds of jumps. Van Praagh and Dore (2002) stated that there is a distinct need to create a standardized jump protocol. Furthermore, some researchers advocate the use of standard operating procedures (SOPs) as being superior to the teaching of “laboratory manuals,” in that SOPs provide a step-by-step guide to the details related to a process which allows for the exact replication of all steps involved when repeating the process (Angiuoli et al., 2008; Tuck et al., 2009). It is important to note that SOPs are widely adopted in many other areas (Angiuoli et al., 2008), such as biology (Roseti et al., 2015) or medicine, for example in stroke prevention and treatment (Ntaios et al., 2015), critical illness (Sherren et al., 2014), or pre-hospital critical care interventions (Rognas et al., 2013).
To the best of our knowledge, no research to-date has stipulated clear guidelines for the CMJ and SJ tests. In fact, published works used different testing procedures, without specifying some essential parts for the replicability of the work.
The first objective of this review was to gather information about testing methods used in research related to the assessment of PF, specifically muscular strength, using CMJ and SJ performance tests in adolescence. The second objective was to investigate if there are standard aspects between these CMJ and SJ testing methods and to identify the most common ones used. If these were not evident, the third objective was to develop SOPs considering: the jump phases; the devices used, and the number of jumps performed. As described by Bobbert et al. (1996), for a better understanding of the differences between the CMJ and the SJ, it is useful to divide both VJs into phases (e.g., starting position, the start of the push-off, the toe-off, and the apex of the jump phase).
With a particular view of the adolescent population, the research question addressed whether there are clearly defined SOPs for the CMJ and the SJ test evident in the literature and then, in parallel, to gather information about both VJs.
Materials and Methods
This review of literature partially adopted the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement (Moher et al., 2009). The following key points were not used: protocol and registration (5), data items (11), risk of bias in individual studies (12), summary measures (13), synthesis of results (14), risk of bias across studies (15, 22), additional analyses (16, 23), risk of bias within studies (19), results of individual studies (20), and synthesis of results (21).
Participants, Interventions, Comparators
Population, Intervention, Comparison, Outcomes, Study design criteria (PICO-S criteria) described in PRISMA (Moher et al., 2009) were considered, to include and exclude research publications. The population under examination were adolescents. According to Radnor et al. (2018), adolescent females include an age range between 12 and 18 years, and for males this age range is between 14 and 18 years. A population between 12 and 18 years old, of both genders with no particular conditions (i.e., mental disease or physical problems), was considered in the present work, to avoid misunderstandings between the different gender age ranges. Children, adults, the elderly, and elite athletes (due to the possible adaptation of the VJs for the sport characteristic) were excluded. As the authors wanted to examine the jump testing method used, interventions, comparisons, and outcomes of the studies were not considered as inclusion or exclusion criteria. Regarding the study design, original articles were eligible for further analysis in which CMJ or SJ performance tests were used to assess lower limb muscular strength as part of PF evaluations in adolescents and not as training interventions. Due to the risk of involving other populations that were not adolescents, longitudinal studies were excluded.
No restriction criteria were applied for the country of origin, but only works written in English were considered. Reviews, meta-analyses, abstracts, citations from scientific conferences, statements, opinion pieces, commentaries, editorials, letters, book reviews, books, and non-peer reviewed journal articles were excluded.
The databases consulted for relevant original articles were PubMed (NLM), Web of Science (TS), and Scopus. The search strategy included the use of the terms in the search field “title” and “topic” of each database. The terms used were divided into three groups. Group A used the following keywords: “countermovement jump∗,” “squat jump∗,” and “vertical jump∗.” Group B used the following keywords: “maximal dynamic strength,” “field-based physical fitness test∗,” “fitness-test battery∗,” “field test∗,” “physical fitness,” “muscle strength,” “strength,” “resistance training,” “physical education,” “reliability,” and “validity.” Finally, group C used the keywords: “youth,” “preadolescence∗,” “adolescent∗,” “public health,” and “health promotion.” For each database, term by term of Group A was matched with each term of Group B and Group C using a Boolean operator (AND).
Data Sources, Studies Sections, and Data Extraction
Due to the growing interest in monitoring PF in young people in the last 10 years (Ruiz et al., 2011; Bianco et al., 2015; Ortega et al., 2015), databases were searched for studies published between the 1 January 2009 up to the 8 July 2019. All original articles selected from databases were transferred to the EndNote X8 software to check the presence of duplicates. In a second screening phase, two investigators, working independently, selected the articles against the inclusion and exclusion criteria described in the section “Participants, Interventions, Comparators,” with a three steps process: (i) selection based on the titles; (ii) selection based on the abstract; and (iii) selection based on the full text. If there was disagreement between the two investigators, a third investigator took the final decision. A flow diagram that summarizes the selection process is reported in Figure 1.
The following information was extracted: first author, year of publication, sample size, participants’ age (range, mean, and standard deviation), gender, aim of the study, active or sedentary, physical or sport activities practiced, jump method used, device employed, and main results. The information extracted from any section of the manuscript was consequently recorded in table format and descriptively summarized.
Following this stage, a descriptive analysis of the CMJ and SJ test technique was performed, and all common aspects between the VJs were considered.
Study Selection and Characteristics
After duplicate removal, title, abstract, and full-text comparison against inclusion and exclusion criteria, the number of publications was reduced from 18,903 to 1,860 with a final total of 119 articles being included. More details are provided in the diagram flow presented in Figure 1.
The 119 original studies were divided into subgroups as follows:
Sixty-nine studies solely using the CMJ test to evaluate muscular strength in adolescents (Table 1);
Five studies solely using the SJ test to evaluate muscular strength in adolescents (Table 2);
Forty-five studies where both the CMJ and the SJ test were employed to evaluate muscular strength in adolescents (Table 3).
A total of 9,940 individuals were considered. Of this 34% (3,373) were females, 57% (5,630) males, and for the remaining 9% (937) gender was not specified. The mean age was 15.2 years.
Synthesized Findings About Both Jumps
Study Characteristics for CMJ
There was no consistency in the description of the CMJ test method in the literature (Tables 1, 3). The protocol developed by Bosco et al. (1983) was the one most commonly adopted (Coelho et al., 2010; Boccolini et al., 2013; Takai et al., 2013; Alberti et al., 2014; Padulo et al., 2016a; Gallo-Salazar et al., 2017; Perroni et al., 2017; Sanchez-Urena et al., 2017; Borges et al., 2018). According to the instructions of this protocol, participants have to stay in an upright position before the execution of the VJ, which starts with a CM until the legs are bent down to 90°. A more precise description, with information of the knee angle during the standing position, the landing (180°), and the CM (reach approximately 90°) phases, is given by Fernandez-Santos et al. (2015), cited one time (Nikolaidis and Knechtle, 2016). Yanci et al. (2016) and Ramirez-Campillo et al. (2018) cited the protocol of Maulder and Cronin (2005), giving general information on the take-off and the landing phases, which both had to be executed with extended knees and ankle joints. Regarding the CM phase, the protocols of Cormack et al. (2008) allowed participants to self-select the CM depth. Information regarding the speed of the CM phases are given by Ortega et al. (2008a) and Chaouachi et al. (2014). In the protocol proposed by Maulder and Cronin (2005) participants were asked to “sink as quickly as possible” reaching a knee angle of approximately 120°, which was similar to Ortega et al. (2008a) who instructed participants to perform a fast CM. The protocol of McGuigan et al. (2006) cited by Secomb et al. (2015) standardized the position of the hands by requiring the participants to perform the jump while holding a light weight (1.0 kg) over the shoulders. The protocol of Castro-Pinero et al. (2009) was employed twice (Moraes et al., 2013; Tishukaj et al., 2017). Because of the use of the arms, it is different from the protocols previously described, as participants had to touch and mark a wall with their fingertips at a highest possible point. Finally, the protocol by Aragon-Vargas (2000) was the only report requesting that the CMJ be executed barefoot.
Study Characteristics for SJ
Likewise, no standardized jump method was detected for the SJ (Tables 2, 3). The protocol of Bosco et al. (1983) was used five times and required participants to perform the SJ from a half squat position with knees bent at 90°, torso straight, and both hands on their waist (Coelho et al., 2010; Alberti et al., 2014; Padulo et al., 2015c, 2016a; Borges et al., 2018). Additionally, three studies (Santos and Janeira, 2011, 2012; Hespanhol et al., 2013) used the 1983 protocol of Bosco (1994), but cited his work of 1994. The protocol of Lloyd et al. (2009) required the participants to take-off and land on the same spot. Furthermore, before the SJ test, some protocols instructed the participants to wait 4 (Maulder and Cronin, 2005), 3 (McGuigan et al., 2006), or 2 s (Lloyd et al., 2009) before executing the jump in order to control the assumed position. More information regarding the landing can be retrieved in the protocol of Fernandez-Santos et al. (2015). According to these researchers, the knees had to be kept extended at an angle of 180° and the ground contact during the landing had to be initiated with the toes. Straight legs in both take-off and landing was also used in the protocol of Maulder and Cronin (2005). Furthermore, according to Lloyd et al. (2009), the landing phase had to be performed with both legs fully extended while looking forward and, to maintain balance, to gaze at a specific point. Arms crossed against the chest was an instruction given by Secomb et al. (2015) citing the protocol of Hasson et al. (2004), while McGuigan et al. (2006) asked participants to hold a light weight (1.0 kg) over their shoulders.
Arm and Feet Information
Most of the CMJ and SJ tests were performed either with both hands positioned on the hips (number of articles = 41) or the waist (number of articles = 2). The arms placed in an akimbo position was also used in some works (number of articles = 4). Eight articles did not describe the hands/arms position and only stated that swinging of the arms was not permitted. However, an arm swinging movement was permitted in some CMJ-related research (number of articles = 16). A summary of information regarding the position of the upper limb for the CMJ and SJ is provided in Table 4.
Number of Jumps Performance Trials and Result Analysis
The number of trials proposed (Table 4) and the results taken for statistical analysis were either two (number of articles = 7), three (number of articles = 47), or more than three (number of articles = 8). Some studies (number of articles = 1) used the mathematical average of the individual jump trials. Alternatively, out of five trials, the lowest and highest values were excluded averaging only the middle measurements (number of articles = 4). Most studies (number of articles = 46) only considered the highest jump.
Several measurement devices were employed for the jump assessment, both to measure and estimate the jump performance. Between the devices that measure the VJ performance based on the center of mass, there are the force plates (number of articles = 25). Between the devices that estimate the performance through the flight time there are: the motion caption system (number of articles = 5), photoelectric cell systems (number of articles = 36), contact mats (number of articles = 19), vanes (number of articles = 10), jump mats (number of articles = 7), contact platforms (number of articles = 7), accelerometer-based systems (number of articles = 6), and linear position transducers (number of articles = 1). More details are given in Tables 1–3.
Jump Phases Identification
The present review based the jump description and analysis according to the jump phases definition proposed by Bobbert et al. (1996): the starting position; the start of push-off; the toe-off; and the apex of the jump. Additionally, we identified the landing phase.
For the CMJ, the majority of studies (number of articles = 30) agreed in defining the starting position as a standing posture. Some authors provided more details about the position of the lower limbs, suggesting that participants maintain straight legs (Lago-Penas et al., 2014) or position their feet shoulder-width apart (Holden et al., 2015).
The SJ starting position was described by 17 authors as a squat position with knees flexed at 90° and by four authors as a semi-squatting position with knees bent at 90° using a ruler as measurement (Maciejewski et al., 2018). Some researchers required participants to remain in the squat position for either 3 (Comfort et al., 2014; Dowse et al., 2017; Pino-Ortega et al., 2018) or 2 s (Maciejewski et al., 2018) before executing the second phase, on command, i.e., the jump phase.
The CMJ push-off is described as a downward movement without an indication of the depth (number of articles = 26). Some authors indicated that the knee angle had to reach 90° (number of articles = 18) before starting the jump. A limited number of authors provided information regarding the speed of the downward movement, i.e., that it had to perform with a rapid descend (Alvarez-San Emeterio and Gonzalez-Badillo, 2010; Alvarez-San Emeterio et al., 2011; Negra et al., 2016, 2017; Dowse et al., 2017). Regarding the push-off phase for the SJ, most studies performed the jump without a CM (number of articles = 14).
The toe-off phase was described as a maximal effort, i.e., as high as possible (29 works related to the CMJ and 11 works related to the SJ).
For the apex of the jump phase, a requirement of both the CMJ and the SJ was that the participants maintain extended legs (number of articles = 11).
Likewise, to provide reliable results during the execution of the jump landing, standardization is required (Borras et al., 2011). Descriptions of the landing phase were similar for the CMJ and the SJ, with most works reporting a fully extended knee landing (number of articles = 8). Similarly, six works required participants to land without legs flexed. Landing with the toes on the same spot as the take-off (number of articles = 4) and in an upright position (number of articles = 1) were other variants of the instructions given to the participants.
A summary of information regarding each CMJ and SJ phase is provided in Table 5.
The main finding of this review is that results and recommendations for both the CMJ and the SJ published in the literature are derived using a vast variety of testing methods and devices to evaluate lower body muscular strength in adolescents. It is questionable, therefore, whether results and, where applicable, normative jump height values, recommended for adolescents and used to assess PF are comparable. Therefore, it is necessary to create SOPs for CMJ and SJ tests that can be used in the context of health promotion and health investigations.
With this in mind, we recommend participants start the CMJ from an erect standing position with a straight torso, knees fully extended, with hands-on-hips and feet shoulder-width apart. We also recommend maintaining this position for at least 2 s before the descending phase. The CMJ push-off phase should be characterized by a downward movement until the knee angle reaches 90° and this should be visually inspected by the examiner and where possible, the use of accelerometer that emits audio feedback when the angle is reached (Cular et al., 2018). Instructions for the toe-off phase should explicitly state that it has to be performed with a maximal effort. Furthermore, during the apex of the jump, participants have to keep their legs fully extended. Finally, the landing phase has to occur with both feet together and with knees fully extended.
The SJ starting position is recommended with a knee flexion angle of 90°, torso straight, hands-on-hips, and feet shoulder-width apart. This position should be maintained for 2 s before jumping. The push-off phase has to be executed avoiding any kind of counter-movement. As with the CMJ test, instructions for the toe-off phase should explicitly state that it has to be executed with maximal effort. During the apex of the jump phase, participants should keep their legs fully extended. The landing phase has to occur with both feet together in an upright position with knees fully extended.
Finally, even though different kinds of shoe material can result in artificially deflated jump power and height measurement (LaPorta et al., 2013), to avoid injuries for both CMJ and SJ tests, these should not be performed barefoot (in case of test/retest participants are required to wear the same shoes).
Regarding the measurement device, a photoelectric system is the most commonly employed technology, is less costly, and is very user-friendly. We, therefore, recommend it a part of the SOPs. Furthermore, the equation H = g∗t2/8 [H: VJ height (m); t: flight time (s); g is 9.81 m/s2] presents high coefficients of determination in the prediction of the VJ height (Attia et al., 2017), and is consequently suggested. Five jumps should be performed during the testing session for both CMJ and SJ, with a 1-min passive rest between jumps to ensure muscular recovery. Due to possible learning effects and consequently higher jump performances, only the best jump should be used for further analysis. Furthermore, we recommend starting the CMJ, and SJ testing session with a standardized warm-up as this can influence jump performance (i.e., a short warm-up can improve the jump height, while a high-intensity plyometric protocol deteriorates the performance) (Romero-Franco and Jimenez-Reyes, 2017). Stretching also seems to potentially cause injury rather than prevent it (Shrier, 1999). Our advice is to perform the same standardized warm-up protocol before any VJ. An example of a suitable warm-up protocol has been suggested by Pinfold et al. (2018). This comprises of two sets of the following exercise: (a) standing on one leg and nod head gently for 30 s; (b) single leg airplane squat with hip thrust (20 repetitions); (c) single leg airplane squat with trunk rotation (20 repetitions); (d) single leg airplane squat with a black theraband resistance applied to the knee that includes trunk rotation with a dumbbell held in hand (10 repetitions); (e) monster walk with a black theraband resistance positioned around the forefoot, forward, and backward (3 m each way); (f) monster walk with a black theraband positioned around the forefoot, side-to-side, i.e., left and right (3 m each way). A summary of the first part of the section “Discussion” can be seen in Table 6.
Table 6. Standard operating procedures proposed for the countermovement jump (CMJ) and the squat jump (SJ).
Concerning the proposed SOPs testing method, the upright position of the torso during the starting position phase for both jumps emphasizes the use of the leg extensors (Moliner-Urdiales et al., 2010; Tounsi et al., 2015). Importantly, this upright position prevents the inclination of the torso segment, a common mistake during the jump performance. In the case of a reduction of forwarding torso inclination by 50%, this can result in a 13% increase of the maximal power (Vanrenterghem et al., 2008). In contrast, hip extensors, upper body, and thigh muscles reduce their contribution on the jump performance when the torso is in a vertical position during the push-off phase, and the plantar flexors contribute mainly to the positive work while knee and hip joint muscles cannot contribute to this positive work (Kopper et al., 2012). In a simulation model, Blache and Monteil (2014) demonstrated that a non-consideration of the erector spinae muscle contribution resulted in a ∼15% reduced SJ height and, if a torso inclination was restricted, the anticipated movement and higher knee joint torque development was possible which resulted in a higher maximal power (Vanrenterghem et al., 2008). A standardized position of the knee angle in the SOPs for the CMJ and the SJ is required during the push-off phase, due to the impact it can have on either increasing or decreasing jump height (Krahenbuhl and Pangrazi, 1983; Gheller et al., 2015) caused by the hip and ankle working differently (Hara et al., 2006, 2008). The execution of the VJ with a lower knee angle compromises the jump performance as a deeper squat starting position results in a higher jump, maximum force, and power output (Gheller et al., 2015). For this precise reason, the SJ has to be carefully monitored. In addition, participants tend to perform a small-amplitude CM (Bobbert et al., 1996; Hasson et al., 2004) and jumps with a CM should be discarded. As the SJ is a purely explosive VJ, some researchers (Hasson et al., 2004; Fitzgerald et al., 2018) argued that the SJ could not be influenced, and consequently performing the SJ with a standardized knee angle or a self-selected jump, apparently present no meaningful difference (Fitzgerald et al., 2018). Based on the discussion above, we strongly advocate the need for the standardized starting position of a 90o knee flexion, feet shoulder-width apart, hands-on-hips, and with a straight torso.
Furthermore, this standardized arm position avoids the contribution of the upper limbs as well as coordinative issues as a confounding variable which, as a result of the shoulder, elbow, hip, and ankle muscles working together, can impact on jump performances between 8 and 11% (Harman et al., 1990; Lees et al., 2004; Hara et al., 2006, 2008). Also, the instruction to maintain both legs fully extended starting from the toe-off to the landing phase (i.e., for the entire duration of the apex of the jump phase) is of crucial importance as this can affect the accuracy of the flight time (Borras et al., 2011). Likewise, the landing phase also has to be standardized to obtain equal results during the execution of the jumps (Borras et al., 2011). According to Bui et al. (2015), there are different factors such as the landing with the feet nearly flat or with the legs bent that can alter the flight time, altering the calculated jump height.
Therefore, it is important to land with straight legs, on the forefoot (Bui et al., 2015) and at the same time to amortize the movement because a stiffer technique increases the risk of injuries (Aerts et al., 2013).
Regarding the devices used, a video analysis technique that measures the displacement of the center of body mass from the standing position to the highest vertical point has been proposed as a gold standard (Aragon-Vargas, 2000). However, this specialized equipment is costly, difficult to calibrate, and transport but also requires a complex procedure to obtain data (Aragon-Vargas, 2000). Less expensive, easy to use devices are contact mats which detect the flight time. These have been reported to produce highly reliable and valid results (Markovic et al., 2004). Force plates derive jump height from the flight time, and they can measure the velocity at take-off (Mcgown et al., 1990; Kibele, 1998; Lara et al., 2006). Furthermore, force plates accurately assess ground reaction forces, and can thus provide a preferred solution in pediatric populations (Fricke et al., 2006). Compared to force plates, photoelectric cell systems present a similar level of validity and they provide excellent test–retest reliability for the estimation of the jump height (Glatthorn et al., 2011). Vertec devices (Sports Imports, Hilliard, OH, United States) are also valid (Leard et al., 2007) and reliable (Young et al., 1997) even though not recommended to use for different reasons. Firstly, the measurement device consists of a metal stand and a height scale composed of color-coded vanes that are displaced by the participant when jumping (Klarova, 2000) which requires the use of the arms. Secondly, and in contrast to force plates, the Vertec device (Sports Imports, Hilliard, OH, United States) does not demonstrate an accurate representation of jump height (Buckthorpe et al., 2012).
Claudino et al. (2017) analyzed the average of five CMJs, but, as opposed to the researchers that use jumps to investigate fatigue or super-compensation effects, we recommend to perform the same number of jumps and to use only the best performance.
The proposal of creating SOPs is supported in the literature by researchers who attempted to develop normative gender or country-related VJ test data (Taylor et al., 2010; Holden et al., 2015; Ramirez-Velez et al., 2017). However, considering the different factors that influence maximal jump height performance (e.g., different test methods or assessment criteria), it is unclear whether results are generally comparable with other populations. Furthermore, Claudino et al. (2017) proposed the CMJ to monitor the neuromuscular status using the average of five jump heights but different jumping methods thus compromising the possibility of comparing the VJ. The above further highlights the need for the development of SOPs, which offers researchers a more rigorous and robust test approach. Indeed, it has to be considered that the developed CMJ test protocol by Bosco et al. (1983) was used in only 5 out of the reviewed 102 original works (Table 4). A similar situation applies to the SJ test whereby the two developed protocols by Bosco et al. (1983) and Bosco (1994) were fully replicated in only 3 of the considered 46 works (Table 5).
Strengths and Limitations
The strength of this review is the stipulation of SOPs for both the CMJ and the SJ test to facilitate the evaluation of the lower limb muscular strength, in a public health context, for adolescents. If these are followed, future communications, sharing of data, result comparisons, and the development of normative data could be made easier and, importantly, these procedures should be more effective in assessing adolescents’ PF. With such a vast variety of testing methods and measurement devices used, results, in fact, are not comparable which present a significant limitation of this review as it was not possible to perform a meta-analysis. The argument above is the rationale for the choice of a quantitative analysis approach of this review. Future works are recommended to review normative data using the stipulated SOPs. A second limitation of the present work is that, due to the mixed samples within the studies analyzed, gender was not considered. Future works should therefore extend their investigation to males, females, and other age groups.
The present review considered the variety of CMJ and SJ testing method procedures published in the literature, making it impossible to identify standard procedures. Consequently, SOPs for both CMJ and SJ tests have been provided in Table 6 and these are strongly recommended to researchers and health practitioners alike. It is, however, always preferred to study the context first before proposing one protocol over another, especially in the context of sporting performance.
LP, APal, and AB developed the research concept and study design. LP, BK, and GM performed the literature review, and data analysis and interpretation. LP and APal performed the data collection. LP, BK, GM, APao, and GD wrote the manuscript. All authors contributed to the revision and approved the submitted version of the manuscript.
Conflict of Interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
We would like to thank Dr. Ewan Thomas and Ph.D. students Ambra Gentile, Kaltrina Feka, and Nemanja Lakicevic of the Ph.D. Program in “Health Promotion and Cognitive Sciences” of the University of Palermo for their help in the manuscript revision. The present work has been presented in the “X Congresso della Società Italiana delle Scienze Motorie e Sportive (SISMES)” in Messina, Italy.
Alberti, G., Annoni, M., Ongaro, L., Scuratil, R., and Michielon, G. (2014). Athletic performance decreases in young basketball players after sitting. Int. J. Sports Sci. Coach. 9, 975–984. doi: 10.1260/1747-95184.108.40.2065
Aloui, A., Chtourou, H., Hammouda, O., Souissi, H., Chaouachi, A., Chamari, K., et al. (2013). Effects of ramadan on the diurnal variations of physical performance and perceived exertion in adolescent soccer players. Biol. Rhythm Res. 44, 869–875. doi: 10.1080/09291016.2013.780697
Alvarez-San Emeterio, C., Antunano, N. P., Lopez-Sobaler, A. M., and Gonzalez-Badillo, J. J. (2011). Effect of strength training and the practice of Alpine skiing on bone mass density, growth, body composition, and the strength and power of the legs of adolescent skiers. J. Strength Cond. Res. 25, 2879–2890. doi: 10.1519/JSC.0b013e31820c8687
Alvarez-San Emeterio, C., and Gonzalez-Badillo, J. J. (2010). The physical and anthropometric profiles of adolescent alpine skiers and their relationship with sporting rank. J. Strength Cond. Res. 24, 1007–1012. doi: 10.1519/JSC.0b013e3181cbabb5
Amaro, N. M., Marinho, D. A., Marques, M. C., Batalha, N. P., and Morouco, P. G. (2017). Effects of dry-land strength and conditioning programs in age group swimmers. J. Strength Cond. Res. 31, 2447–2454. doi: 10.1519/jsc.0000000000001709
Angiuoli, S. V., Gussman, A., Klimke, W., Cochrane, G., Field, D., Garrity, G., et al. (2008). Toward an online repository of standard operating procedures (SOPs) for (Meta) genomic annotation. OMICS J. Integr. Biol. 12, 137–141. doi: 10.1089/omi.2008.0017
Artero, E. G., Espana-Romero, V., Castro-Pinero, J., Ortega, F. B., Suni, J., Castillo-Garzon, M. J., et al. (2011). Reliability of field-based fitness tests in youth. Int. J. Sports Med. 32, 159–169. doi: 10.1055/s-0030-1268488
Attia, A., Dhahbi, W., Chaouachi, A., Padulo, J., Wong, D. P., and Chamari, K. (2017). Measurement errors when estimating the vertical jump height with flight time using photocell devices: the example of Optojump. Biol. Sport 34, 63–70. doi: 10.5114/biolsport.2017.63735
Barnes, J. L., Schilling, B. K., Falvo, M. J., Weiss, L. W., Creasy, A. K., and Fry, A. C. (2007). Relationship of jumping and agility performance in female volleyball athletes. J. Strength Cond. Res. 21, 1192–1196. doi: 10.1519/00124278-200711000-00036
Battaglia, G., Paoli, A., Bellafiore, M., Bianco, A., and Palma, A. (2014). Influence of a sport-specific training background on vertical jumping and throwing performance in young female basketball and volleyball players. J. Sports Med. Phys. Fit. 54, 581–587.
BenOunis, O., BenAbderrahman, A., Chamari, K., Ajmol, A., BenBrahim, M., Hammouda, A., et al. (2013). Association of short-passing ability with athletic performances in youth soccer players. Asian J. Sports Med. 4, 41–48.
Bianco, A., Jemni, M., Thomas, E., Patti, A., Paoli, A., Roque, J. R., et al. (2015). A systematic review to determine reliability and usefulness of the field-based test batteries for the assessment of physical fitness in adolescents - the asso project. Int. J. Occup. Med. Environ. Health 28, 445–478. doi: 10.13075/ijomeh.1896.00393
Bobbert, M. F., Gerritsen, K. G. M., Litjens, M. C. A., and VanSoest, A. J. (1996). Why is countermovement jump height greater than squat jump height? Med. Sci. Sports Exerc. 28, 1402–1412. doi: 10.1097/00005768-199611000-9
Boccolini, G., Brazzit, A., Bonfanti, L., and Alberti, G. (2013). Using balance training to improve the performance of youth basketball players. Sport Sci. Health 9, 37–42. doi: 10.1007/s11332-013-0143-z
Borges, P. H., Cumming, S., Ronque, E. R. V., Cardoso, F., Avelar, A., Rechenchosky, L., et al. (2018). Relationship between tactical performance, somatic maturity and functional capabilities in young soccer players. J. Hum. Kinet. 64, 160–169. doi: 10.1515/hukin-2017-90
Borras, X., Balius, X., Drobnic, F., and Galilea, P. (2011). Vertical jump assessment on volleyball: a follow-up of three seasons of a high-level volleyball team. J. Strength Cond. Res. 25, 1686–1694. doi: 10.1519/JSC.0b013e3181db9f2e
Bosco, C., Ito, A., Komi, P. V., Luhtanen, P., Rahkila, P., Rusko, H., et al. (1982). Neuromuscular function and mechanical efficiency of human leg extensor muscles during jumping exercises. Acta Physiol. Scand. 114, 543–550. doi: 10.1111/j.1748-1716.1982.tb07022.x
Bosco, C., and Rusko, H. (1983). The effect of prolonged skeletal muscle stretch-shortening cycle on recoil of elastic energy and on energy expenditure. Acta Physiol. Scand. 119, 219–224. doi: 10.1111/j.1748-1716.1983.tb07331.x
Bosco, C. K., and Komi, P. V. (1979). Potentiation of the mechanical behaviour of the human skeletal muscle through prestretching. Acta Physiol. Scand. 106, 467–472. doi: 10.1111/j.1748-1716.1979.tb06427.x
Brännström, A., Yu, J. G., Jonsson, P., Åkerfeldt, T., Stridsberg, M., and Svensson, M. (2017). Vitamin D in relation to bone health and muscle function inyoungfemale soccer players. Eur. J. Sport Sci. 17, 249–256. doi: 10.1080/17461391.2016.1225823
Brunelli, D. T., Rodrigues, A., Lopes, W. A., Gáspari, A. F., Bonganha, V., Montagner, P. C., et al. (2014). Monitoring of immunological parameters in adolescent basketball athletes during and after a sports season. J. Sports Sci. 32, 1050–1059. doi: 10.1080/02640414.2013.878806
Bubanj, S., Mitkoviæ, M., Gašiæ, T., Maziæ, S., Stankoviæ, R., Radovanoviæ, D., et al. (2018). The impact of resistance training program on the muscle strength and bone density in adolescent athletes. Acta Fac. Med. Naissensis 35, 201–215. doi: 10.2478/afmnai-2018-22
Buchan, D. S., Ollis, S., Thomas, N. E., and Baker, J. S. (2010). The influence of a high intensity physical activity intervention on a selection of health related outcomes: an ecological approach. BMC Public Health 10:8. doi: 10.1186/1471-2458-10-8
Buchheit, M., Mendez-Villanueva, A., Quod, M., Quesnel, T., and Ahmaidi, S. (2010). Improving acceleration and repeated sprint ability in well-trained adolescent handball players: speed versus sprint interval training. Int. J. Sports Physiol. Perform. 5, 152–164. doi: 10.1123/ijspp.5.2.152
Bui, H. T., Farinas, M. I., Fortin, A. M., Comtois, A. S., and Leone, M. (2015). Comparison and analysis of three different methods to evaluate vertical jump height. Clin. Physiol. Funct. Imaging 35, 203–209. doi: 10.1111/cpf.12148
Çakir-Atabek, H. (2014). Relationship between anaerobic power, vertical jump and aerobic performance in adolescent track and field athletes. J. Phys. Educ. Sport 14, 643–648. doi: 10.7752/jpes.2014.04100
Carvalho, F. L., Carvalho, M. C., Simao, R., Gomes, T. M., Costa, P. B., Neto, L. B., et al. (2012). Acute effects of a warm-up including active, passive, and dynamic stretching on vertical jump performance. J. Strength Cond. Res. 26, 2447–2452. doi: 10.1519/JSC.0b013e31823f2b36
Caspersen, C. J., Powell, K. E., and Christenson, G. M. (1985). Physical activity, exercise, and physical fitness: definitions and distinctions for health-related research. Public Health Rep. 100, 126–131.
Castagna, C., Ganzetti, M., Ditroilo, M., Giovannelli, M., Rocchetti, A., and Manzi, V. (2013). Concurrent validity of vertical jump performance assessment systems. J. Strength Cond. Res. 27, 761–768. doi: 10.1519/JSC.0b013e31825dbcc5
Castro-Pinero, J., Gonzalez-Montesinos, J. L., Mora, J., Keating, X. D., Girela-Rejon, M. J., Sjostrom, M., et al. (2009). Percentile values for muscular strength field tests in children aged 6 to 17 years: influence of weight status. J. Strength Cond. Res. 23, 2295–2310. doi: 10.1519/JSC.0b013e3181b8d5c1
Catley, M. J., and Tomkinson, G. R. (2013). Normative health-related fitness values for children: analysis of 85347 test results on 9-17-year-old Australians since 1985. Br. J. Sports Med. 47, 98–108. doi: 10.1136/bjsports-2011-090218
Chamari, K., Hachana, Y., Ahmed, Y. B., Galy, O., Sghaier, F., Chatard, J. C., et al. (2004). Field and laboratory testing in young elite soccer players. Br. J. Sports Med. 38, 191–196. doi: 10.1136/bjsm.2002.004374
Chaouachi, A., Hammami, R., Kaabi, S., Chamari, K., Drinkwater, E. J., and Behm, D. G. (2014). Olympic weightlifting and plyometric training with children provides similar or greater performance improvements than traditional resistance training. J. Strength Cond. Res. 28, 1483–1496. doi: 10.1519/Jsc.0000000000000305
Chaouachi, M., Granacher, U., Makhlouf, I., Hammami, R., Behm, D. G., and Chaouachi, A. (2017). Within session sequence of balance and plyometric exercises does not affect training adaptations with youth soccer athletes. J. Sports Sci. Med. 16, 125–136.
Chelly, M. S., Fathloun, M., Cherif, N., Ben Amar, M., Tabka, Z., and Van Praagh, E. (2009). Effects of a back squat training program on leg power, jump, and sprint performances in junior soccer players. J. Strength Cond. Res. 23, 2241–2249. doi: 10.1519/JSC.0b013e3181b86c40
Claudino, J. G., Cronin, J., Mezencio, B., McMaster, D. T., McGuigan, M., Tricoli, V., et al. (2017). The countermovement jump to monitor neuromuscular status: a meta-analysis. J. Sci. Med. Sport 20, 397–402. doi: 10.1016/j.jsams.2016.08.011
Claudino, J. G., Cronin, J. B., Mezencio, B., Pinho, J. P., Pereira, C., Mochizuki, L., et al. (2016). Autoregulating jump performance to induce functional overreaching. J. Strength Cond. Res. 30, 2242–2249. doi: 10.1519/JSC.0000000000001325
Coelho, E., Silva, M. J., Moreira Carvalho, H., Gonçalves, C. E., Figueiredo, A. J., Elferink-Gemser, M. T., et al. (2010). Growth, maturation, functional capacities and sport-specific skills in 12-13 year-old- Basketball players. J. Sports Med. Phys. Fit. 50, 174–181.
Comfort, P., Bullock, N., and Pearson, S. J. (2012a). A comparison of maximal squat strength and 5-, 10-, and 20-meter sprint times, in athletes and recreationally trained men. J. Strength Cond. Res. 26, 937–940. doi: 10.1519/JSC.0b013e31822e5889
Comfort, P., Haigh, A., and Matthews, M. J. (2012b). Are changes in maximal squat strength during preseason training reflected in changes in sprint performance in rugby league players? J. Strength Cond. Res. 26, 772–776. doi: 10.1519/JSC.0b013e31822a5cbf
Comfort, P., Stewart, A., Bloom, L., and Clarkson, B. (2014). Relationships between strength, sprint, and jump performance in well-trained youth soccer players. J. Strength Cond. Res. 28, 173–177. doi: 10.1519/JSC.0b013e318291b8c7
Cormack, S. J., Newton, R. U., McGuigan, M. R., and Doyle, T. L. A. (2008). Reliability of measures obtained during single and repeated countermovement jumps. Int. J. Sports Physiol. Perform. 3, 131–144. doi: 10.1123/ijspp.3.2.131
Cortis, C., Tessitore, A., Lupo, C., Pesce, C., Fossile, E., Figura, F., et al. (2011). Inter-limb coordination, strength, jump, and sprint performances following a youth men’s basketball game. J. Strength Cond. Res. 25, 135–142. doi: 10.1519/JSC.0b013e3181bde2ec
Cular, D., Ivancev, V., Zagatto, A. M., Milic, M., Beslija, T., Sellami, M., et al. (2018). Validity and reliability of the 30-s continuous jump for anaerobic power and capacity assessment in combat sport. Front. Physiol. 9:543. doi: 10.3389/fphys.2018.00543
Cunha, G. S., Cumming, S. P., Valente-dos-Santos, J., Duarte, J. P., Silva, G., Dourado, A. C., et al. (2017). Interrelationships among jumping power, sprinting power and pubertal status after controlling for size in young male soccer players. Percept. Mot. Skills 124, 329–350. doi: 10.1177/0031512516686720
Daneshfar, A., Gahreman, D. E., Koozehchian, M. S., Amani Shalamzari, S., Hassanzadeh Sablouei, M., Rosemann, T., et al. (2018). Multi directional repeated sprint is a valid and reliable test for assessment of junior handball players. Front. Physiol. 9:317. doi: 10.3389/fphys.2018.00317
Davis, K. L., Kang, M., Boswell, B. B., DuBose, K. D., Altman, S. R., and Binkley, H. M. (2008). Validity and reliability of the medicine ball throw for kindergarten children. J. Strength Cond. Res. 22, 1958–1963. doi: 10.1519/JSC.0b013e3181821b20
Dayne, A. M., McBride, J. M., Nuzzo, J. L., Triplett, N. T., Skinner, J., and Burr, A. (2011). Power output in the jump squat in adolescent male athletes. J. Strength Cond. Res. 25, 585–589. doi: 10.1519/JSC.0b013e3181c1fa83
Dowse, R. A., McGuigan, M. R., and Harrison, C. (2017). Effects of a resistance training intervention on strength, power, and performance in adolescent dancers. J. Strength Cond. Res. [Epub ahead of print]. doi: 10.1519/JSC.0000000000002288
Duncan, M. J., Hankey, J., and Nevill, A. M. (2013). Peak-power estimation equations in 12- to 16-year old children: comparing linear with allometric models. Pediatr. Exerc. Sci. 25, 385–393. doi: 10.1123/pes.25.3.385
Eagles, A. N., Sayers, M. G. L., Bousson, M., and Lovell, D. I. (2015). Current methodologies and implications of phase identification of the vertical jump: a systematic review and meta-analysis. Sports Med. 45, 1311–1323. doi: 10.1007/s40279-015-0350-7
Faigenbaum, A. D., McFarland, J. E., Kelly, N. A., Ratamess, N. A., Kang, J., and Hoffman, J. R. (2010). Influence of recovery time on warm-up effects in male adolescent athletes. Pediatr. Exerc. Sci. 22, 266–277. doi: 10.1123/pes.22.2.266
Fernandez-Santos, J. R., Ruiz, J. R., Cohen, D. D., Gonzalez-Montesinos, J. L., and Castro-Pinero, J. (2015). Reliability and validity of tests to assess lower-body muscular power in children. J. Strength Cond. Res. 29, 2277–2285. doi: 10.1519/Jsc.0000000000000864
Fischetti, F., Cataldi, S., and Greco, G. (2019). A combined plyometric and resistance training program improves fitness performance in 12 to 14-years-old boys. Sport Sci. Health 1–7. doi: 10.1007/s11332-019-00560-2
Fischetti, F., Vilardi, A., Cataldi, S., and Greco, G. (2018). Effects of plyometric training program on speed and explosive strength of lower limbs in young athletes. J. Phys. Educ. Sport 18, 2476–2482. doi: 10.7752/jpes.2018.04372
Fitzgerald, J. S., Johnson, L., Tomkinson, G., Stein, J., and Roemmich, J. N. (2018). Test-retest reliability of jump execution variables using mechanography: a comparison of jump protocols. J. Sports Sci. 36, 963–969. doi: 10.1080/02640414.2017.1346818
Franco-Márquez, F., Rodríguez-Rosell, D., González-Suárez, J. M., Pareja-Blanco, F., Mora-Custodio, R., Yañez-García, J. M., et al. (2015). Effects of combined resistance training and plyometrics on physical performance in young soccer players. Int. J. Sports Med. 36, 906–914. doi: 10.1055/s-0035-1548890
Fricke, O., Justine, W., Tutlewski, B., and Schoenau, E. (2006). Mechanography—a new device for the assessment of muscle function in pediatrics. Pediatr. Res. 59, 46–49. doi: 10.1203/01.pdr.0000191580.07644.1c
Gallo-Salazar, C., Del Coso, J., Barbado, D., Lopez-Valenciano, A., Santos-Rosa, F. J., Sanz-Rivas, D., et al. (2017). Impact of a competition with two consecutive matches in a day on physical performance in young tennis players. Appl. Physiol., Nutr. Metab. 42, 750–756. doi: 10.1139/apnm-2016-2540
Garber, C. E., Blissmer, B., Deschenes, M. R., Franklin, B. A., Lamonte, M. J., Lee, I. M., et al. (2011). American college of sports medicine position stand. quantity and quality of exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in apparently healthy adults: guidance for prescribing exercise. Med. Sci. Sports Exerc. 43, 1334–1359. doi: 10.1249/MSS.0b013e318213fefb
Garcia-Pinillos, F., Martinez-Amat, A., Hita-Contreras, F., Martinez-Lopez, E. J., and Latorre-Roman, P. A. (2014). Effects of a contrast training program without external load on vertical jump, kicking speed, sprint, and agility of young soccer players. J. Strength Cond. Res. 28, 2452–2460. doi: 10.1519/JSC.0000000000000452
Garcia-Pinillos, F., Ruiz-Ariza, A., del Castillo, R. M., and Latorre-Roman, P. A. (2015). Impact of limited hamstring flexibility on vertical jump, kicking speed, sprint, and agility in young football players. J. Sports Sci. 33, 1293–1297. doi: 10.1080/02640414.2015.1022577
Garrido, N., Marinho, D. A., Reis, V. M., van den Tillaar, R., Costa, A. M., Silva, A. J., et al. (2010). Does combined dry land strength and aerobic training inhibit performance of young competitive swimmers? J. Sports Sci. Med. 9, 300–310.
Gavanda, S., Geisler, S., Quittmann, O. J., and Schiffer, T. (2019). The effect of block versus daily undulating periodization on strength and performance in adolescent football players. Int. J. Sports Physiol. Perform. 14, 814–821. doi: 10.1123/ijspp.2018-2609
Gheller, R. G., Dal Pupo, J., Ache-Dias, J., Detanico, D., Padulo, J., and dos Santos, S. G. (2015). Effect of different knee starting angles on intersegmental coordination and performance in vertical jumps. Hum. Mov. Sci. 42, 71–80. doi: 10.1016/j.humov.2015.04.010
Glatthorn, J. F., Gouge, S., Nussbaumer, S., Stauffacher, S., Impellizzeri, F. M., and Maffiuletti, N. A. (2011). Validity and reliability of Optojump photoelectric cells for estimating vertical jump height. J. Strength Cond. Res. 25, 556–560. doi: 10.1519/JSC.0b013e3181ccb18d
Gonzalez-Garcia, J., Morencos, E., Balsalobre-Fernandez, C., Cuellar-Rayo, A., and Romero-Moraleda, B. (2019). Effects of 7-week hip thrust versus back squat resistance training on performance in adolescent female soccer players. Sports 7, 80. doi: 10.3390/sports7040080
Gonzalo-Skok, O., Serna, J., Rhea, M. R., and Marin, P. J. (2017). Age differences in measures of functional movement and performance in highly trained youth basketball players. Int. J. Sports Phys. Ther. 12, 812–821. doi: 10.16603/ijspt20170812
Gorski, M., Starczewski, M., Pastuszak, A., Mazur-Rozycka, J., Gajewski, J., and Busko, K. (2018). Changes of strength and maximum power of lower extremities in adolescent handball players during a two-year training cycle. J. Hum. Kinet. 63, 95–103. doi: 10.2478/hukin-2018-0
Granacher, U., and Gollhofer, A. (2011). Is there an association between variables of postural control and strength in adolescents? J. Strength Cond. Res. 25, 1718–1725. doi: 10.1519/JSC.0b013e3181dbdb08
Granacher, U., Muehlbauer, T., Doerflinger, B., Strohmeier, R., and Gollhofer, A. (2011). Promoting strength and balance in adolescents during physical education: effects of a short-term resistance training. J. Strength Cond. Res. 25, 940–949. doi: 10.1519/JSC.0b013e3181c7bb1e
Greco, G., Messina, G., Angiulli, A., Patti, A., Iovane, A., and Fischetti, F. (2019). A preliminary comparative study on the effects of pilates training on physical fitness of young female volleyball players. Acta Med. Mediterr. 35, 783–789. doi: 10.19193/0393-6384_2019_2_118
Hale, D., Kollock, R., Pace, J., and Sanders, G. (2019). Vertical jump and agility performance improve after an 8-week conditioning program in youth female volleyball athletes. J. Phys. Educ. Sport 19, 765–771. doi: 10.7752/jpes.2019.01109
Hall, E., Bishop, D. C., and Gee, T. I. (2016). Effect of plyometric training on handspring vault performance and functional power in youth female gymnasts. PLoS One 11:e0148790. doi: 10.1371/journal.pone.0148790
Hammami, M., Negra, Y., Billaut, F., Hermassi, S., Shephard, R. J., and Chelly, M. S. (2018). Effects of lower-limb strength training on agility, repeated sprinting with changes of direction, leg peak power, and neuromuscular adaptations of soccer players. J. Strength Cond. Res. 32, 37–47. doi: 10.1519/JSC.0000000000001813
Hammami, R., Sekulic, D., Selmi, M. A., Fadhloun, M., Spasic, M., Uljevic, O., et al. (2018). Maturity status as a determinant of the relationships between conditioning qualities and preplanned agility in young handball athletes. J. Strength Cond. Res. 32, 2302–2313. doi: 10.1519/JSC.0000000000002390
Hammami, M., Negra, Y., Shephard, R. J., and Chelly, M. S. (2017). The effect of standard strength vs. contrast strength training on the development of sprint, agility, repeated change of direction, and jump in junior male soccer players. J. Strength Cond. Res. 31, 901–912. doi: 10.1519/jsc.0000000000001815
Hammami, M. A., Ben Abderrahman, A., Hackney, A. C., Kebsi, W., Owen, A. L., Nebigh, A., et al. (2017). Hormonal (cortical-gonadotropic axis) and physical changes with two years intense exercise training in elite young soccer players. J. Strength Cond. Res. 31, 2388–2397. doi: 10.1519/Jsc.0000000000001664
Hammami, M. A., Ben Abderrahmane, A., Nebigh, A., Le Moal, E., Ben Ounis, O., Tabka, Z., et al. (2013). Effects of a soccer season on anthropometric characteristics and physical fitness in elite young soccer players. J. Sports Sci. 31, 589–596. doi: 10.1080/02640414.2012.746721
Hara, M., Shibayama, A., Takeshita, D., Hay, D. C., and Fukashiro, S. (2008). A comparison of the mechanical effect of arm swing and countermovement on the lower extremities in vertical jumping. Hum. Mov. Sci. 27, 636–648. doi: 10.1016/j.humov.2008.04.001
Harman, E. A., Rosenstein, M. T., Frykman, P. N., and Rosenstein, R. M. (1990). The effects of arms and countermovement on vertical jumping. Med. Sci. Sports Exerc. 22, 825–833. doi: 10.1249/00005768-199012000-15
Harries, S. K., Lubans, D. R., Buxton, A., MacDougall, T. H. J., and Callister, R. (2018). Effects of 12-week resistance training on sprint and jump performances in competitive adolescent rugby union players. J. Strength Cond. Res. 32, 2762–2769. doi: 10.1519/jsc.0000000000002119
Hasson, C. J., Dugan, E. L., Doyle, T. L., Humphries, B., and Newton, R. U. (2004). Neuromechanical strategies employed to increase jump height during the initiation of the squat jump. J. Electromyogr. Kinesiol. 14, 515–521. doi: 10.1016/j.jelekin.2003.12.004
Hespanhol, J. E., de Arruda, M., Bolanos, M. A. C., and Silva, R. L. P. (2013). Sensitivity and specificity of the strength performance diagnostic by different vertical jump tests in soccer and volleyball at puberty. Rev. Bras. Med. Esporte 19, 367–370. doi: 10.1590/S1517-86922013000500014
Holden, S., Boreham, C., Doherty, C., Wang, D., and Delahunt, E. (2015). Clinical assessment of countermovement jump landing kinematics in early adolescence: sex differences and normative values. Clin. Biomech. 30, 469–474. doi: 10.1016/j.clinbiomech.2015.03.008
Hoshikawa, Y., Iida, T., Muramatsu, M., Ii, N., Nakajima, Y., Chumank, K., et al. (2013). Effects of stabilization training on trunk muscularity and physical performances in youth soccer players. J. Strength Cond. Res. 27, 3142–3149. doi: 10.1519/JSC.0b013e31828bed36
Hydren, J. R., Kraemer, W. J., Volek, J. S., Dunn-Lewis, C., Comstock, B. A., Szivak, T. K., et al. (2013). Performance changes during a weeklong high-altitude alpine ski-racing training camp in lowlander young athletes. J. Strength Cond. Res. 27, 924–937. doi: 10.1519/JSC.0b013e31827a9c62
Idrizovic, K., Sekulic, D., Uljevic, O., Spasic, M., Gjinovci, B., João, P. V., et al. (2018). The effects of 3-month skill-based and plyometric conditioning on fitness parameters in junior female volleyball players. Pediatr. Exerc. Sci. 30, 353–363. doi: 10.1123/pes.2017-78
Klusemann, M. J., Pyne, D. B., Fay, T. S., and Drinkwater, E. J. (2012). Online video-based resistance training improves the physical capacity of junior basketball athletes. J. Strength Cond. Res. 26, 2677–2684. doi: 10.1519/JSC.0b013e318241b021
Kopper, B., Ureczky, D., and Tihanyi, J. (2012). Trunk position influences joint activation pattern and physical performance during vertical jumping. Acta Physiol. Hung. 99, 194–205. doi: 10.1556/APhysiol.99.2012.2.13
Lago-Penas, C., Rey, E., Casais, L., and Gomez-Lopez, M. (2014). Relationship Between Performance Characteristics and the Selection Process in Youth Soccer Players. J. Hum. Kinet. 40, 189–199. doi: 10.2478/hukin-2014-21
LaPorta, J. W., Brown, L. E., Coburn, J. W., Galpin, A. J., Tufano, J. J., Cazas, V. L., et al. (2013). Effects of different footwear on vertical jump and landing parameters. J. Strength Cond. Res. 27, 733–737. doi: 10.1519/JSC.0b013e318280c9ce
Leard, J. S., Cirillo, M. A., Katsnelson, E., Kimiatek, D. A., Miller, T. W., Trebincevic, K., et al. (2007). Validity of two alternative systems for measuring vertical jump height. J. Strength Cond. Res. 21, 1296–1299. doi: 10.1519/00124278-200711000-00055
Lehnert, M., Svoboda, Z., and Cuberek, R. (2013). The correlation between isokinetic strength of knee extensors and vertical jump performance in adolescent soccer players in an annual training cycle. Acta Univ. Palacki. Olomuc. Gymnica 43, 7–15. doi: 10.5507/ag.2013.001
Lesinski, M., Muehlbauer, T., and Granacher, U. (2016). Concurrent validity of the Gyko inertial sensor system for the assessment of vertical jump height in female sub-elite youth soccer players. BMC Sports Sci. Med. Rehabil. 8:35. doi: 10.1186/s13102-016-0061-x
Lloyd, R. S., Oliver, J. L., Hughes, M. G., and Williams, C. A. (2009). Reliability and validity of field-based measures of leg stiffness and reactive strength index in youths. J. Sports Sci. 27, 1565–1573. doi: 10.1080/02640410903311572
Lloyd, R. S., Oliver, J. L., Hughes, M. G., and Williams, C. A. (2011). Specificity of test selection for the appropriate assessment of different measures of stretch-shortening cycle function in children. J. Sports Med. Phys. Fit. 51, 595–602.
Loturco, I., Barbosa, A. C., Nocentini, R. K., Pereira, L. A., Kobal, R., Kitamura, K., et al. (2016). A correlational analysis of tethered swimming, swim sprint performance and dry-land power assessments. Int. J. Sports Med. 37, 211–218. doi: 10.1055/s-0035-1559694
Lyle, M. A., Valero-Cuevas, F. J., Gregor, R. J., and Powers, C. M. (2015). Lower extremity dexterity is associated with agility in adolescent soccer athletes. Scand. J. Med. Sci. Sports 25, 81–88. doi: 10.1111/sms.12162
Maciejewski, H., Rahmani, A., Chorin, F., Lardy, J., Samozino, P., and Ratel, S. (2018). Methodological considerations on the relationship between the 1,500-M rowing ergometer performance and vertical jump in national-level adolescent rowers. J. Strength Cond. Res. 33, 3000–3007. doi: 10.1519/JSC.0000000000002406
Maio Alves, J. M., Rebelo, A. N., Abrantes, C., and Sampaio, J. (2010). Short-term effects of complex and contrast training in soccer players’ vertical jump, sprint, and agility abilities. J. Strength Cond. Res. 24, 936–941. doi: 10.1519/JSC.0b013e3181c7c5fd
Makhlouf, I., Castagna, C., Manzi, V., Laurencelle, L., Behm, D. G., and Chaouachi, A. (2016). Effect of sequencing strength and endurance training in young male soccer players. J. Strength Cond. Res. 30, 841–850. doi: 10.1519/Jsc.0000000000001164
Markovic, G., Dizdar, D., Jukic, I., and Cardinale, M. (2004). Reliability and factorial validity of squat and countermovement jump tests. J. Strength Cond. Res. 18, 551–555. doi: 10.1519/00124278-200408000-00028
Marques, M. C., Izquierdo, M., Gabbett, T. J., Travassos, B., Branquinho, L., and van den Tillaar, R. (2016). Physical fitness profile of competitive young soccer players: determination of positional differences. Int. J. Sports Sci. Coach. 11, 693–701. doi: 10.1177/1747954116667107
Marques, M. C., Pereira, A., Reis, I. G., and van den Tillaar, R. (2013). Does an in-season 6-week combined sprint and jump training program improve strength-speed abilities and kicking performance in young soccer players? J. Hum. Kinet. 39, 157–166. doi: 10.2478/hukin-2013-78
Marques, M. C., Tillaar, R., Vescovi, J. D., and Gonzalez-Badillo, J. J. (2008). Changes in strength and power performance in elite senior female professional volleyball players during the in-season: a case study. J. Strength Cond. Res. 22, 1147–1155. doi: 10.1519/JSC.0b013e31816a42d0
Martin, A. C., Heazlewood, I. T., Kitic, C. M., Lys, I., and Johnson, L. (2019). Possible hormone predictors of physical performance in adolescent team sport athletes. J. Strength Cond. Res. 33, 417–425. doi: 10.1519/jsc.0000000000002014
Matthys, S. P. J., Fransen, J., Vaeyens, R., Lenoir, M., and Philippaerts, R. (2013). Differences in biological maturation, anthropometry and physical performance between playing positions in youth team handball. J. Sports Sci. 31, 1344–1352. doi: 10.1080/02640414.2013.781663
Mayorga-Vega, D., Merino-Marban, R., and Viciana, J. (2014). Criterion-related validity of sit-and-reach tests for estimating hamstring and lumbar extensibility: a meta-analysis. J. Sports Sci. Med. 13, 1–14.
McCormick, B. T., Hannon, J. C., Newton, M., Shultz, B., Detling, N., and Young, W. B. (2016). The effects of frontal- and sagittal-plane plyometrics on change-of-direction speed and power in adolescent female basketball players. Int. J. Sports Physiol. Perform. 11, 102–107. doi: 10.1123/ijspp.2015-58
Mcgown, C. M., Conlee, R. K., Sucec, A. A., Buono, M. J., Tamayo, M., Phillips, W., et al. (1990). Gold medal volleyball - the training-program and physiological profile of the 1984 olympic champions. Res. Q. Exerc. Sport 61, 196–200. doi: 10.1080/02701367.1990.10608675
McGuigan, M. R., Doyle, T. L., Newton, M., Edwards, D. J., Nimphius, S., and Newton, R. U. (2006). Eccentric utilization ratio: effect of sport and phase of training. J. Strength Cond. Res. 20, 992–995. doi: 10.1519/R-19165.1
Moir, G., Button, C., Glaister, M., and Stone, M. H. (2004). Influence of familiarization on the reliability of vertical jump and acceleration sprinting performance in physically active men. J. Strength Cond. Res. 18, 276–280. doi: 10.1519/00124278-200405000-00013
Moliner-Urdiales, D., Ortega, F. B., Vicente-Roriguez, G., Rey-Lopez, J. P., Gracia-Marco, L., Widhalm, K., et al. (2010). Association of physical activity with muscular strength and fat-free mass in adolescents: the HELENA study. Eur. J. Appl. Physiol. 109, 1119–1127. doi: 10.1007/s00421-010-1457-z
Moraes, E., Fleck, S. J., Ricardo Dias, M., and Simao, R. (2013). Effects on strength, power, and flexibility in adolescents of nonperiodized vs. daily nonlinear periodized weight training. J. Strength Cond. Res. 27, 3310–3321. doi: 10.1519/JSC.0b013e31828de8c3
Muehlbauer, T., Gollhofer, A., and Granacher, U. (2012). Sex-related effects in strength training during adolescence: a pilot study. Percept. Mot. Skills 115, 953–968. doi: 10.2466/06.10.30.PMS.115.6.953-68
Munivrana, G., Filipcic, A., and Filipcic, T. (2015). Relationship of speed, agility, neuromuscular power, and selected anthropometrical variables and performance results of male and female junior tennis players. Coll. Antropol. 39(Suppl. 1), 109–116.
Myer, G. D., Ford, K. R., Palumbo, J. P., and Hewett, T. E. (2005). Neuromuscular training improves performance and lower-extremity biomechanics in female athletes. J. Strength Cond. Res. 19, 51–60. doi: 10.1519/13643.1
Negra, Y., Chaabene, H., Hammami, M., Hachana, Y., and Granacher, U. (2016). Effects of high-velocity resistance training on athletic performance in prepuberal male soccer athletes. J. Strength Cond. Res. 30, 3290–3297. doi: 10.1519/JSC.0000000000001433
Negra, Y., Chaabene, H., Sammoud, S., Bouguezzi, R., Mkaouer, B., Hachana, Y., et al. (2017). Effects of plyometric training on components of physical fitness in prepuberal male soccer athletes: the role of surface instability. J. Strength Cond. Res. 31, 3295–3304. doi: 10.1519/JSC.0000000000002262
Nikolaidis, P. T., and Knechtle, B. (2016). Effect of the recovery duration of a repeated sprint exercise on the power output, jumping performance and lactate concentration in prepubescent soccer players. Biomed. Hum. Kinet. 8, 58–64. doi: 10.1515/bhk-2016-19
Nimphius, S., Mcguigan, M. R., and Newton, R. U. (2010). Relationship between strength, power, speed, and change of direction performance of female softball players. J. Strength Cond. Res. 24, 885–895. doi: 10.1519/JSC.0b013e3181d4d41d
Ntaios, G., Bornstein, N. M., Caso, V., Christensen, H., De Keyser, J., Diener, H. C., et al. (2015). The european stroke organisation guidelines: a standard operating procedure. Int. J. Stroke 10(Suppl. A100), 128–135. doi: 10.1111/ijs.12583
Oliver, J. L., Lloyd, R. S., and Whitney, A. (2015). Monitoring of in-season neuromuscular and perceptual fatigue in youth rugby players. Eur. J. Sport Sci. 15, 514–522. doi: 10.1080/17461391.2015.1063700
Ortega, F. B., Artero, E. G., Ruiz, J. R., Espana-Romero, V., Jimenez-Pavon, D., Vicente-Rodriguez, G., et al. (2011). Physical fitness levels among European adolescents: the HELENA study. Br. J. Sports Med. 45, 20–29. doi: 10.1136/bjsm.2009.062679
Ortega, F. B., Artero, E. G., Ruiz, J. R., Vicente-Rodriguez, G., Bergman, P., Hagstromer, M., et al. (2008a). Reliability of health-related physical fitness tests in European adolescents. the helena study. Int. J. Obes. 32, S49–S57. doi: 10.1038/ijo.2008.183
Ortega, F. B., Cadenas-Sanchez, C., Sanchez-Delgado, G., Mora-Gonzalez, J., Martinez-Tellez, B., Artero, E. G., et al. (2015). Systematic review and proposal of a field-based physical fitness-test battery in preschool children: the PREFIT battery. Sports Med. 45, 533–555. doi: 10.1007/s40279-014-0281-88
Padulo, J., Ardigo, L. P., Attene, G., Cava, C., Wong, D. P., Chamari, K., et al. (2016a). The effect of slope on repeated sprint ability in young soccer players. Res. Sports Med. 24, 320–330. doi: 10.1080/15438627.2016.1222276
Padulo, J., Bragazzi, N. L., Nikolaidis, P. T., Dello Iacono, A., Attene, G., Pizzolato, F., et al. (2016b). Repeated sprint ability in young basketball players: multi-direction vs. one-change of direction (Part 1). Front. Physiol. 7:133. doi: 10.3389/fphys.2016.00133
Padulo, J., Laffaye, G., Haddad, M., Chaouachi, A., Attene, G., Migliaccio, G. M., et al. (2015a). Repeated sprint ability in young basketball players: one vs. two changes of direction (Part 1). J. Sports Sci. 33, 1480–1492. doi: 10.1080/02640414.2014.992936
Padulo, J., Tabben, M., Ardigo, L. P., Ionel, M., Popa, C., Gevat, C., et al. (2015b). Repeated sprint ability related to recovery time in young soccer players. Res. Sports Med. 23, 412–423. doi: 10.1080/15438627.2015.1076419
Padulo, J., Tabben, M., Attene, G., Ardigo, L. P., Dhahbi, W., and Chamari, K. (2015c). The impact of jumping during recovery on repeated sprint ability in young soccer players. Res. Sports Med. 23, 240–252. doi: 10.1080/15438627.2015.1040919
Paradisis, G. P., Pappas, P. T., Theodorou, A. S., Zacharogiannis, E. G., Skordilis, E. K., and Smirniotou, A. S. (2014). Effects of static and dynamic stretching on sprint and jump performance in boys and girls. J. Strength Cond. Res. 28, 154–160. doi: 10.1519/JSC.0b013e318295d2fb
Paul, D. J., Marques, J. B., and Nassis, G. P. (2019). The effect of a concentrated period of soccer-specific fitness training with small-sided games on physical fitness in youth players. J. Sports Med. Phys. Fit. 59, 962–968. doi: 10.23736/S0022-4707.18.08547-X
Perroni, F., Mario, V., Guidetti, L., and Baldari, C. (2017). Is self-administered rating scale for pubertal development a predictor of countermovement jump in young soccer players? Open Sports Sci. J. 10, 122–131. doi: 10.2174/1875399x01710010122
Pojskic, H., Aslin, E., Krolo, A., Jukic, I., Uljevic, O., Spasic, M., et al. (2018). Importance of reactive agility and change of direction speed in differentiating performance levels in junior soccer players: reliability and validity of newly developed soccer-specific tests. Front. Physiol. 9:506. doi: 10.3389/fphys.2018.00506
Quagliarella, L., Sasanelli, N., Belgiovine, G., Accettura, D., Notarnicola, A., and Moretti, B. (2011). Evaluation of counter movement jump parameters in young male soccer players. J. Appl. Biomater. Biomech. 9, 40–46. doi: 10.5301/Jabb.2011.7732
Radnor, J. M., Lloyd, R. S., and Oliver, J. L. (2017). Individual response to different forms of resistance training in school-aged boys. J. Strength Cond. Res. 31, 787–797. doi: 10.1519/JSC.0000000000001527
Radnor, J. M., Oliver, J. L., Waugh, C. M., Myer, G. D., Moore, I. S., and Lloyd, R. S. (2018). The influence of growth and maturation on stretch-shortening cycle function in youth. Sports Med. 48, 57–71. doi: 10.1007/s40279-017-0785-0
Ramirez-Campillo, R., Sanchez-Sanchez, J., Gonzalo-Skok, O., Rodriguez-Fernandez, A., Carretero, M., and Nakamura, F. Y. (2018). Specific changes in young soccer player’s fitness after traditional bilateral vs. Unilateral combined strength and plyometric training. Front. Physiol. 9:265. doi: 10.3389/fphys.2018.00265
Ramirez-Velez, R., Correa-Bautista, J. E., Lobelo, F., Cadore, E. L., Alonso-Martinez, A. M., and Izquierdo, M. (2017). Vertical jump and leg power normative data for colombian schoolchildren aged 9-17.9 years: the fuprecol study. J. Strength Cond. Res. 31, 990–998. doi: 10.1519/JSC.0000000000001550
Rognas, L., Hansen, T. M., Kirkegaard, H., and Tonnesen, E. (2013). Standard operating procedure changed pre-hospital critical care anaesthesiologists’ behaviour: a quality control study. Scand. J. Trauma Resusc. Emerg. Med. 21:84. doi: 10.1186/1757-7241-21-84
Roseti, L., Serra, M., and Bassi, A. (2015). Standard operating procedure for the good manufacturing practice-compliant production of human bone marrow mesenchymal stem cells. Methods Mol. Biol. 1283, 171–186. doi: 10.1007/7651_2014_103
Ruiz, J. R., Castro-Pinero, J., Espana-Romero, V., Artero, E. G., Ortega, F. B., Cuenca, M. M., et al. (2011). Field-based fitness assessment in young people: the ALPHA health-related fitness test battery for children and adolescents. Br. J. Sports Med. 45, 518–524. doi: 10.1136/bjsm.2010.075341
Ruiz, J. R., Francisco, B. O., Gutierrez, A., Meusel, D., Sjostrom, M., and Castillo, M. J. (2006). Health-related fitness assessment in childhood and adolescence: a European approach based on the AVENA, EYHS and HELENA studies. J. Public Health 14, 269–277. doi: 10.1007/s10389-006-0059-z
Saez de Villarreal, E., Suarez-Arrones, L., Requena, B., Haff, G. G., and Ferrete, C. (2015). Effects of plyometric and sprint training on physical and technical skill performance in adolescent soccer players. J. Strength Cond. Res. 29, 1894–1903. doi: 10.1519/JSC.0000000000000838
Sanchez-Urena, B., Martinez-Guardado, I., Crespo, C., Timon, R., Calleja-Gonzalez, J., Ibanez, S. J., et al. (2017). The use of continuous vs. intermittent cold water immersion as a recovery method in basketball players after training: a randomized controlled trial. Phys. Sportsmed. 45, 134–139. doi: 10.1080/00913847.2017.1292832
Santos, E. J., and Janeira, M. A. (2011). The effects of plyometric training followed by detraining and reduced training periods on explosive strength in adolescent male basketball players. J. Strength Cond. Res. 25, 441–452. doi: 10.1519/JSC.0b013e3181b62be3
Santos, E. J., and Janeira, M. A. (2012). The effects of resistance training on explosive strength indicators in adolescent basketball players. J. Strength Cond. Res. 26, 2641–2647. doi: 10.1519/JSC.0b013e31823f8dd4
Sawczuk, T., Ben, J., Scantlebury, S., Weakley, J., Read, D., Costello, N., et al. (2017). Between-day reliability and usefulness of a fitness testing battery in youth sport athletes: reference data for practitioners. Meas. Phys. Educ. Exerc. Sci. 22, 11–18. doi: 10.1080/1091367X.2017.1360304
Secomb, J. L., Lundgren, L. E., Farley, O. R. L., Tran, T. T., Nimphius, S., and Sheppard, J. M. (2015). Relationships between lower-body muscle structure and lower-body strength, power, and muscle-tendon complex stiffness. J. Strength Cond. Res. 29, 2221–2228. doi: 10.1519/Jsc.0000000000000858
Seitz, L. B., Reyes, A., Tran, T. T., Saez de Villarreal, E., and Haff, G. G. (2014). Increases in lower-body strength transfer positively to sprint performance: a systematic review with meta-analysis. Sports Med. 44, 1693–1702. doi: 10.1007/s40279-014-0227-221
Sekulic, D., Spasic, M., and Esco, M. E. (2014). Predicting agility performance with other performance variables in pubescent boys: a multiple-regression approach. Percept. Mot. Skills 118, 447–461. doi: 10.2466/25.10.PMS.118k16w4
Sheppard, J. M., Cronin, J. B., Gabbett, T. J., McGuigan, M. R., Etxebarria, N., and Newton, R. U. (2008). Relative importance of strength, power, and anthropometric measures to jump performance of elite volleyball players. J. Strength Cond. Res. 22, 758–765. doi: 10.1519/JSC.0b013e31816a8440
Sherren, P. B., Tricklebank, S., and Glover, G. (2014). Development of a standard operating procedure and checklist for rapid sequence induction in the critically ill. Scand. J. Trauma Resusc. Emerg. Med. 22:41. doi: 10.1186/s13049-014-0041-7
Shrier, I. (1999). Stretching before exercise does not reduce the risk of local muscle injury: a critical review of the clinical and basic science literature. Clin. J. Sport Med. 9, 221–227. doi: 10.1097/00042752-199910000-00007
Smart, D. J., and Gill, N. D. (2013). Effects of an off-season conditioning program on the physical characteristics of adolescent rugby union players. J. Strength Cond. Res. 27, 708–717. doi: 10.1519/JSC.0b013e31825d99b0
Spiteri, T., Nimphius, S., Hart, N. H., Specos, C., Sheppard, J. M., and Newton, R. U. (2014). Contribution of strength characteristics to change of direction and agility performance in female basketball athletes. J. Strength Cond. Res. 28, 2415–2423. doi: 10.1519/Jsc.0000000000000547
Struzik, A., Pietraszewski, B., Kawczyñski, A., Winiarski, S., Juras, G., and Rokita, A. (2017). Manifestations of proprioception during vertical jumps to specific heights. J. Strength Cond. Res. 31, 1694–1701. doi: 10.1519/JSC.0000000000001868
Taylor, M. J., Cohen, D., Voss, C., and Sandercock, G. R. (2010). Vertical jumping and leg power normative data for English school children aged 10-15 years. J. Sports Sci. 28, 867–872. doi: 10.1080/02640411003770212
Thomas, C., Comfort, P., Jones, P. A., and Dos’Santos, T. (2017a). A comparison of isometric midthigh-pull strength, vertical jump, sprint speed, and change-of-direction speed in academy netball players. Int. J. Sports Physiol. Perform. 12, 916–921. doi: 10.1123/ijspp.2016-317
Thomas, C., Kyriakidou, I., Dos’Santos, T., and Jones, P. A. (2017b). Differences in vertical jump force-time characteristics between stronger and weaker adolescent basketball players. Sports 5:63. doi: 10.3390/sports5030063
Tishukaj, F., Shalaj, I., Gjaka, M., Ademi, B., Ahmetxhekaj, R., Bachl, N., et al. (2017). Physical fitness and anthropometric characteristics among adolescents living in urban or rural areas of Kosovo. BMC Public Health 17:711. doi: 10.1186/s12889-017-4727-4
Tomioka, M., Owings, T. M., and Grabiner, M. D. (2001). Lower extremity strength and coordination are independent contributors to maximum vertical jump height. J. Appl. Biomech. 17, 181–187. doi: 10.1123/jab.17.3.181
Torres-Luque, G., Hernandez-Garcia, R., Garatachea, N., and Nikolaidis, P. T. (2015). Anthropometric characteristics and neuromuscular function in young judo athletes by sex, age and weight category. Sport Sci. Health 11, 117–124. doi: 10.1007/s11332-015-0218-0
Tounsi, M., Aouichaoui, C., Elloumi, M., Dogui, M., Tabka, Z., and Trabelsi, Y. (2015). Reference values of vertical jumping performances in healthy tunisian adolescent. Ann. Hum. Biol. 42, 116–124. doi: 10.3109/03014460.2014.926989
Tricoli, V., Lamas, L., Carnevale, R., and Ugrinowitsch, C. (2005). Short-term effects on lower-body functional power development: weightlifting vs. vertical jump training programs. J. Strength Cond. Res. 19, 433–437. doi: 10.1519/00124278-200505000-00032
Tuck, M. K., Chan, D. W., Chia, D., Godwin, A. K., Grizzle, W. E., Krueger, K. E., et al. (2009). Standard operating procedures for serum and plasma collection: early detection research network consensus statement standard operating procedure integration working group. J. Proteome Res. 8, 113–117. doi: 10.1021/pr800545q
Turner, A. N., Bishop, C. J., Cree, J. A., Edwards, M. L., Chavda, S., Read, P. J., et al. (2017). Do fencers require a weapon-specific approach to strength and conditioning training? J. Strength Cond. Res. 31, 1662–1668. doi: 10.1519/JSC.0000000000001637
Ugrinowitsch, C., Tricoli, V., Rodacki, A. L. F., Batista, M., and Ricard, M. D. (2007). Influence of training background on jumping height. J. Strength Cond. Res. 21, 848–852. doi: 10.1519/00124278-200708000-00033
Uthoff, A., Oliver, J., Cronin, J., Harrison, C., and Winwood, P. (2018). Sprint-specific training in youth: backward running vs. forward running training on speed and power measures in adolescent male athletes. J. Strength Cond. Res. doi: 10.1519/JSC.0000000000002914 [Epub ahead of print].
Van Hooren, B., and Zolotarjova, J. (2017). The difference between countermovement and squat jump performances: a review of underlying mechanisms with practical applications. J. Strength Cond. Res. 31, 2011–2020. doi: 10.1519/JSC.0000000000001913
Vanrenterghem, J., Lees, A., and De Clercq, D. (2008). Effect of forward trunk inclination on joint power output in vertical jumping. J. Strength Cond. Res. 22, 708–714. doi: 10.1519/JSC.0b013e3181636c6c
Weakley, J. J., Till, K., Darrall-Jones, J., Roe, G. A., Phibbs, P. J., Read, D., et al. (2017). Strength and conditioning practices in adolescent rugby players: relationship with changes in physical qualities. J. Strength Cond. Res. 33, 2361–2369. doi: 10.1519/jsc.0000000000001828
Wisloff, U., Castagna, C., Helgerud, J., Jones, R., and Hoff, J. (2004). Strong correlation of maximal squat strength with sprint performance and vertical jump height in elite soccer players. Br. J. Sports Med. 38, 285–288. doi: 10.1136/bjsm.2002.002071
Wong, P. L., Chamari, K., Dellal, A., and Wisloff, U. (2009). Relationship between anthropometric and physiological characteristics in youth soccer players. J. Strength Cond. Res. 23, 1204–1210. doi: 10.1519/JSC.0b013e31819f1e52
Wong, P. L., Chamari, K., and Wisloff, U. (2010). Effects of 12-week on-field combined strength and power training on physical performance among U-14 young soccer players. J. Strength Cond. Res. 24, 644–652. doi: 10.1519/JSC.0b013e3181ad3349
Yanci, J., Camara, J., Vizcay, J. J., and Young, W. B. (2016). Examining age and gender effects in physical performance in young athletes aged 12-16 years. Int. J. Sports Sci. Coach. 11, 538–544. doi: 10.1177/1747954116655052
Yousfi, N., Mejri, M. A., Rouissi, M., Hammami, A., Tabben, M., Chaouachi, A., et al. (2018). Effects of lunar phases on short-term, explosive physical performance among young trained athletes. Chronobiol. Int. 35, 565–572. doi: 10.1080/07420528.2017.1422741
Keywords: vertical jump, CMJ, SJ, standardized protocol, adolescent, public health, standard operating procedure, physical fitness
Citation: Petrigna L, Karsten B, Marcolin G, Paoli A, D’Antona G, Palma A and Bianco A (2019) A Review of Countermovement and Squat Jump Testing Methods in the Context of Public Health Examination in Adolescence: Reliability and Feasibility of Current Testing Procedures. Front. Physiol. 10:1384. doi: 10.3389/fphys.2019.01384
Received: 24 January 2019; Accepted: 21 October 2019;
Published: 07 November 2019.
Edited by:Francis Degache, Motion Lab Therapeutic and Performance Sports Institute, Switzerland
Reviewed by:Moritz Schumann, German Sport University Cologne, Germany
Johnny Padulo, University of Milan, Italy
Copyright © 2019 Petrigna, Karsten, Marcolin, Paoli, D’Antona, Palma and Bianco. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.