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ORIGINAL RESEARCH article

Front. Physiol., 25 August 2022
Sec. Exercise Physiology
This article is part of the Research Topic Physical Stimulus-Performance-Adaptation : Understanding the physiological relationship View all 9 articles

Effects of an experimental short-time high-intensity warm-up on explosive muscle strength performance in soccer players: A pilot study

  • 1Sport and Exercise Sciences Research Unit, Department of Psychology, Educational Science and Human Movement, University of Palermo, Palermo, Italy
  • 2Faculty of Sport Sciences, Waseda University, Saitama, Japan
  • 3Department of Basic Medical Sciences, Neuroscience and Sense Organs, University of Study of Bari, Bari, Italy
  • 4Faculty of Sport and Physical Education, University of Novi Sad, Novi Sad, Serbia

Objective: This study aimed to evaluate the effects of an experimental short-time warm-up consisting of a small number of intermittent high-intensity sprints on explosive muscle strength performance in soccer players and to identify recovery times after performing the sprints. Furthermore, we evaluated the reliability of a smartphone app in jumping performance.

Methods: Twenty male soccer players were given the following tests: 1) the counter-movement jump (CMJ) test with the Microgate system, 2) the counter-movement jump (CMJ) test with the MyJump smartphone app, and 3) the handgrip strength test. The experimental short-time high-intensity warm-up was carried out 1 week after test administration. The warm-up consisted of three maximum sprints over 60 m with 120 s of recovery between sprints. Then, the tests were administered again: the vertical jump height (VJH) performances (five trials) were measured 90 s after the last sprint; the handgrip strength performances (three trials) were measured 120 s after the last vertical jump test.

Results: The maximum VJH was found in the third trial of the CMJ test, 330 s after the last sprint (p < 0.01), the result closest to the baseline. The lowest VJH was found in the first trial of the CMJ test, 90 s after the last sprint (p < 0.05). Pearson’s analysis between the CMJ test with the Microgate system and the CMJ test with MyJump showed a strong correlation (R = 0.96). Lin’s concordance correlation coefficient showed a substantial concordance (ρc = 0.959) between measures.

Conclusion: This experimental short-time warm-up of high-intensity intermittent sprints appears to be a simple, quick, and efficient activity to accelerate soccer players’ optimal performance.

1 Introduction

In soccer, coaches and athletic trainers emphasize on developing physical abilities such as explosive strength, endurance, and speed. The reason is related to the physical demands that soccer requires, such as explosive performance in sprint or vertical jump and endurance in running (Metaxas et al., 2005). For this reason, coaches and athletic trainers organize training loads based on physical demands and related energy expenditure. In fact, soccer players have to adapt to the demands of soccer, that is, to the stress of the anaerobic metabolism (Drust et al., 2000; Kunz et al., 2019).

It is well known that both a pre-match warm-up for the starting team and a half-time warm-up for substitute players are indispensable to preparing and to obtain the best possible performance during the match (McCrary et al., 2015; Silva et al., 2018; Patti et al., 2022). However, the time between the pre-match warm-up and the start of the match can adversely affect performance. Considering the short time available between the first and the second time, it is advisable to administer a suitable warm-up (Hammami et al., 2018). Hills et al. (2021) questioned the effectiveness of practices typically used by substitute players before pitch-entry. Mohr et al. (2004) showed that soccer players perform less high-intensity sprint at the initial phase of the second half compared with the first half. On the contrary, substitute players often have a short time available before pitch-entry (Hills et al., 2020). Hills et al. (2020) investigated the use and practices of substitutes in professional soccer. The authors showed that there is no certainty about the effectiveness of the current pre-pitch-entry practices, and the 100% of practitioners highlighted the need for further studies (Hills et al., 2020).

Mohr et al. (2004) demonstrated the positive effects of warm-up in muscles for sprint performance, but the effects on performance depend on the intensity of the activities. Different studies showed reduced physical performance after the half-time, and some authors explain this event as the lack of an adequate warm-up for muscles and temperature-related mechanisms demanded by the intensity of the activities and the short time available in the interval between the first and the second time (Bishop, 2003a; Bishop, 2003b; Mohr et al., 2004).

A high-intensity warm-up has been revealed to increase anaerobic energy provision, improving anaerobic metabolism, and these physiological mechanisms can result in improvement of the performance (Bishop, 2003a; Bishop, 2003b; McGowan et al., 2015; Yanaoka et al., 2020a; Yanaoka et al., 2020b). Intermittent high-intensity exercise such as repeated sprinting within relatively short time intervals is considered a relevant fitness prerequisite in competitive soccer players (Krustrup et al., 2006). Intermittent high-intensity sprints are defined as sprints of ≤10 s with recovery periods of >60–300 s between sprints. Intermittent high-intensity sprints can be an excellent strategy to reach an optimal muscle temperature before performance. This warm-up can be useful after the half-time warm-up in substitute players. However, intermittent high-intensity sprints can lead to decreased performance and neuromuscular fatigue (Balsom et al., 1992; Bishop and Claudius, 2005; Pearcey et al., 2016). Yanaoka et al. (2020b) suggested that an intermittent sprint is a short sprint interspersed with a recovery period long enough to allow for an almost complete recovery of sprint performance (Yanaoka et al., 2020a). Consequently, increasing the recovery time between sprints is a potential method for reducing neuromuscular fatigue and improving performance (Monks et al., 2017). For example, in a recent study, the athletes completed an intermittent sprint protocol that consisted of 10 s of rest, 5 s of maximum sprint, and 105 s of active recovery with repeated cycles over 10 min (Yanaoka et al., 2020a).

Furthermore, from the perspective of performance evaluation in sports, the measurement of jumping performance is of fundamental importance (Griffiths et al., 2019; Katushabe and Kramer, 2020; Giustino et al., 2022), especially through the use of dedicated devices. Recently, a smartphone-based application for jumping performance evaluation, named MyJump, has been widely used in various sports contexts. However, the validity and the reliability of this app are still unclear (Montalvo et al., 2021).

Based on this background, the first aim of this study was to evaluate the effects of an experimental short-time warm-up consisting of a small number of intermittent high-intensity sprints on explosive muscle strength performance in soccer players and to identify recovery times after performing the sprints. In addition, this study aimed to investigate the reliability of a smartphone app in jumping performance.

2 Materials and methods

2.1 Study design

The design of this pilot study was a “pre-post study” in which participants were assessed at two different times (T0 and T1). A total of 27 participants were enrolled; however, seven of them dropped out. Then, 20 male soccer players (age: 21.35 ± 4.79 years; weight: 70.75 ± 8.66 kg; height: 1.74 ± 0.05 m) of an Italian soccer team were included in the study. To be eligible for the study, participants had to be male with at least 3 years of soccer experience. Participants who had had any musculoskeletal injury in the past year could not be included in the study. Goalkeepers, due to their peculiar physical demands and the specific training they usually perform, were not included in the study.

Vertical jump height (VJH) performance and handgrip strength performance of participants were assessed at the baseline (T0) and immediately following an experimental short-time high-intensity warm-up performed 1 week after the baseline (T1). The experimental short-time high-intensity warm-up was carried out 1 week after baseline assessment in order to ensure the total neuromuscular recovery of participants. In the 24 h, prior to both test sessions (i.e., T0 and T1), all participants had not performed exhaustion exercises. Both test sessions were administered at the same time (between 4:00 and 6:00 p.m.).

The study was carried out in compliance with the principles of the Declaration of Helsinki and approved by the Ethics Committee of the Faculty of Sport and Physical Education of the University of Novi Sad (No. 46-10-02/2). Written informed consent was obtained from each participant before the participation in the study.

2.2 Study protocol and experimental short-time high-intensity warm-up

As shown in Figure 1, the study protocol and the experimental short-time high-intensity warm-up consisted of 1) 5 min of general activation; 2) three maximum sprints on 60 m with 120 s of recovery between sprints; 3) 90 s of recovery; 4) five counter-movement jump (CMJ) tests with 120 s of recovery between the trials (R1, R2, R3, R4, and R5); 5) 120 s of recovery; and 6) three handgrip strength tests with 120 s of recovery between trials.

FIGURE 1
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FIGURE 1. Study protocol and experimental short-time high-intensity warm-up.

All measurements were carried out by a technician of the Italian Football Federation (FIGC) at the baseline (T0) and after the experimental warm-up (T1).

2.3 Measurements

At the baseline (T0), before administering the tests, participants were measured for their weight and height. Weight was evaluated using a scale to the nearest 100 g (WUNDER 960 Classic; Trezzo sull’Adda, Milano, Italia). Height was evaluated using a stadiometer sensitive to changes of 1 cm (Seca 220; Hamburg, Germany).

The tests administered both at the baseline (T0) and after 1 week (T1) were as follows: 1) the counter-movement jump (CMJ) test with the Microgate system (Montalvo et al., 2021); 2) the counter-movement jump (CMJ) test with MyJump smartphone app (Stanton et al., 2017); and 3) the handgrip strength test (Bianco et al., 2016; Battaglia et al., 2018). The best performance of each test was considered in order to have the participants’ best performances by creating a baseline.

2.3.1 Counter-movement jump test with the Microgate system

It is an optical detection system composed of a transmitting and a receiving bar. The system allows the measurement of flight and contact time of a jump with a precision of 1/1,000 of a second. Starting from these fundamental basic data, the dedicated software allows to obtain a series of parameters related to jumping performance with maximum precision and in real-time (Montalvo et al., 2021).

2.3.2 Counter-movement jump test with MyJump smartphone app

It is a smartphone app that allows to record jumping performance. Each CMJ was recorded in the sagittal plane with 240 Hz sampling. The choice to use the sagittal plane was made according to the protocol by Stanton et al. (2017). Indeed, the authors showed that the detection of the jump was more precise in the sagittal plane than in the frontal plane. The iPhone (Apple Inc., Cupertino, CA) was inserted in a support, and the video recording was started using a Bluetooth remote control, enabling the camera to remain in an identical, static position for all CMJ trials. Video collected by the iPhone was processed using the MyJump smartphone app (Stanton et al., 2017).

2.3.3 Handgrip strength test

This test aims to measure the maximum isometric strength exerted by the muscles of the hand, in particular, the muscles responsible for flexion of the metatarsi and phalanges, flexion of the fingers, and adduction of the thumb (Bianco et al., 2016; Patti et al., 2017; Garcia-Pinillos et al., 2018; Bonaventura et al., 2020).

2.4 Statistical analysis

All data were recorded in an Excel file. We performed a priori power analysis to calculate the sample size required using a power of 0.80 (G*Power software version 3.1.9.2; Heinrich Heine University, Düsseldorf, Germany). Then, we calculated a post hoc power analysis to determine the power of the sample size recruited. The Shapiro–Wilk normality test was used to analyze data distribution. Repeated-measures analysis of variance and the Tukey test were used for comparisons. Pearson’s analysis was used to evaluate the performance correlation between the CMJ test with the Microgate system and the CMJ test with MyJump smartphone app. These analyses were conducted via Jamovi software (version 2.3.0.0, The jamovi project (2021)) with the significance level set at 0.05. Furthermore, Lin’s concordance correlation coefficient between the CMJ test with the Microgate system and the CMJ test with MyJump was used to measure the reliability of the smartphone app. This statistical test was carried out by MedCalc software (version 20.112, MedCalc Software Ltd, Ostend, Belgium).

3 Results

A priori sample size power analysis required a number of 27 participants. However, since seven participants dropped out, only 20 participants were eligible for the study. Hence, a post hoc sample size analysis revealed a power of 70%.

The chronometric measures of sprints have been maintained without significant differences (Figure 2).

FIGURE 2
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FIGURE 2. Chronometric measures of sprints.

The Shapiro–Wilk normality test showed a Gaussian distribution of variables.

As reported in Table 1, the maximum VJH was found in the third trial (R3) of the CMJ test, 330 s after the last sprint (R1 vs. R3, p < 0.01), the result closest to the baseline. The lowest VJH was found in the first trial (R1) of the CMJ test, 90 s after the last sprint (p < 0.05). Table 2 shows the results of repeated-measures analysis of variance and the Tukey test. Figure 3 shows the performances of the CMJ test at T0 and of all the trials at T1. The handgrip strength test showed no significant changes after the experimental short-time high-intensity warm-up.

TABLE 1
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TABLE 1. Descriptive analysis of CMJ performances with the Microgate system.

TABLE 2
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TABLE 2. CMJ performances with the Microgate system—post hoc comparisons vs. time.

FIGURE 3
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FIGURE 3. CMJ performances.

Pearson’s analysis between the CMJ test with the Microgate system at T0 and the CMJ test with MyJump smartphone app at T0 showed a strong correlation (R = 0.96). Furthermore, Lin’s concordance correlation coefficient showed a substantial concordance (ρc = 0.959) between measures, as shown in Table 3 and Figure 4. Hence, these results show a similar trend between the CMJ tests measured with the two different systems (Tables 4, 5).

TABLE 3
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TABLE 3. CMJ performance comparison between the Microgate system and MyJump smartphone app.

FIGURE 4
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FIGURE 4. Concordance correlation coefficient of CMJ performances.

TABLE 4
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TABLE 4. Descriptive analysis of CMJ performance with MyJump.

TABLE 5
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TABLE 5. CMJ performances with MyJump app—post hoc comparisons vs. time.

4 Discussion

The first aim of this study was to evaluate the effects of an experimental short-time warm-up consisting of a small number of intermittent high-intensity sprints on explosive muscle strength performance in soccer players and to identify recovery times after performing the sprints. Furthermore, this study aimed to investigate the reliability of a smartphone app in jumping performance.

First, to date, it is not entirely clear whether a warm-up with intermittent high-intensity exercises facilitates performance. Our aim was to maintain the same high-intensity exercise during the sprints. Indeed, the sprint chronometric measurements were maintained without significant differences. Therefore, both the number of sprints and the recovery times adopted were supported by the analysis of the sprint times. In this study, we administered three maximum sprints on 60 m with 120 s of recovery between the sprints. Few studies in the literature have shown positive results on sprints. For instance, Mohr et al. (2004) reported a significantly improved repeated sprint time using three maximum sprints on 30 m with 25 s of recovery.

The results showed the positive effects of the experimental short-time high-intensity warm-up on explosive muscle strength performance in soccer players. In fact, the intermittent high-intensity sprints did not affect the CMJ performances. In detail, the results showed that the performance of CMJ performed immediately after the experimental short-time high-intensity warm-up (R1) was significantly worse than the baseline. Consequently, these results suggested that 90 s after the last sprint, participants had not yet recovered optimal anaerobic capacity. Our data indicate that only 330 s after the last sprint, the performance of CMJ overlaps the baseline (R3). These results are in line with the findings of a previous meta-analysis in which the authors showed that performance was optimal after repeated exercises performed at intensities between 60 and 84% and using rest periods between 7 and 10 min (Wilson et al., 2013). Smith and Fry (2007) demonstrated that the regulatory myosin light-chain (RLC) phosphorylation of positive responders had increased 23% at 5 min of recovery. The literature suggests that the RLC is the primary mechanism responsible for post-activation potentiation (PAP) and improves the interaction between myosin and actin filaments (Grange et al., 1993; Sweeney et al., 1993). Mohr et al. (2004) demonstrated that muscle temperature affects athletes’ performance. Lower performance was associated with a decrease in muscle and core temperature. The warm-up should improve acute explosive performance, especially for athletes who perform many intermittent sprints during the match (Edge et al., 2005).

As for the duration of the warm-up, a previous research compared the effects of a long warm-up (general + specific) and a short warm-up (specific) on intermediate running performance (3-minute run) (van den Tillaar et al., 2017). Since no significant differences in running performance and physiological parameters were found between the two warm-up protocols, authors stated that a short warm-up is as effective as a long warm-up for intermediate running performance (van den Tillaar et al., 2017).

Regarding the recovery times, the literature suggests that a passive rest period reduces performance. Our data showed that a short-time warm-up consisting of intermittent high-intensity sprints could bring athletes’ performance to optimal levels after 330 s of recovery. These findings are in line with the results shown by other research groups in which the authors described that running at 70% HRmax (Zois et al., 2013) and after a series of jumps improved performance compared to traditional rest (Abade et al., 2017).

The handgrip strength performances showed no significant change after 690 s of recovery from the last sprint. Some studies have described that the presence/absence of supraspinal fatigue (or central fatigue) can be determined by changes in strength muscle performance (e.g., handgrip strength) (Paavolainen et al., 1999; Kilduff et al., 2007; Martin et al., 2010). Based on our handgrip strength results, we can suppose that our sample showed no central fatigue after the experimental warm-up.

Furthermore, the results of the CMJ using MyJump smartphone app showed a strong correlation with the values obtained with the Microgate system. These findings confirm the reliability of the application, which can be used for easier data collection for future studies.

5 Conclusion

In conclusion, this study highlights that a short-time high-intensity warm-up composed of intermittent sprints appears to be a simple, quick, and efficient activity to accelerate soccer players’ optimal performance. This experimental warm-up is of short duration in order to be considered applicable also between the first and the second time. For this reason, exercises and recovery times have been selected so that the entire protocol can also be administered during the interval of a match. Our data show that this short-time warm-up can be administered in the interval between the first and second time. In fact, our results indicate that a high-intensity warm-up in the short-time interval can ensure physical conditions necessary for high-performance levels during the second half time. A previous study investigated the effects of different half-time re-warm-up durations on intermittent sprint performance, finding that both the 3-min re-warm-up and the 7-min re-warm-up were more effective in improving intermittent sprint performance after the half-time than a traditional passive half-time practice (Yanaoka et al., 2018). However, further studies are needed to confirm our results based on the fact that some studies have shown that the warm-up is a complex question since volume changes, intensity, and recovery may negatively affect the subsequent performance.

Finally, among the limitations to this study, it should be mentioned that the sample size did not reach the minimum power of 80% required, but it was slightly lower (70%).

Data availability statement

The raw data of this article will be made available by the authors, without undue reservation.

Ethics statement

The studies involving human participants were reviewed and approved by the Faculty of Sport and Physical Education of the University of Novi Sad (No. 46-10-02/2). The patients/participants provided their written informed consent to participate in this study.

Author contributions

AB and APal: conceptualization; GG, AM, and GMu: data collection; APat: data analysis; APat, VG, and GMe: methodology; AB: supervision; SC, PD, and NH: visualization; APat: writing—original draft; VG and NH: writing—review and editing.

Funding

The publication was made with the co-financing of the European Union—FESR or FSE, PON Research and Innovation 2014-2020—DM 1062/2021.

Acknowledgments

The authors thank all the participants of the ASD Sporting Termini who participated in this study.

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.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors, and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: sport performance, soccer, warm-up, handgrip strength, jumping performance, strength, vertical jump height

Citation: Patti A, Giustino V, Hirose N, Messina G, Cataldi S, Grigoli G, Marchese A, Mulè G, Drid P, Palma A and Bianco A (2022) Effects of an experimental short-time high-intensity warm-up on explosive muscle strength performance in soccer players: A pilot study. Front. Physiol. 13:984305. doi: 10.3389/fphys.2022.984305

Received: 01 July 2022; Accepted: 20 July 2022;
Published: 25 August 2022.

Edited by:

Badicu Georgian, Transilvania University of Brașov, Romania

Reviewed by:

Zeki Akyildiz, Gazi University, Turkey
Ezequiel Gonçalves, State University of Northern Paraná, Brazil

Copyright © 2022 Patti, Giustino, Hirose, Messina, Cataldi, Grigoli, Marchese, Mulè, Drid, 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.

*Correspondence: Giuseppe Messina, giuseppe.messina17@unipa.it

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