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Editorial12 December 2023
Editorial: Women in Biomechanics and Control of Human Movement: 2022–2023

The special issue showcases the diverse research by women, ranging from dual-task performance under physical exertion to factors associated with sports performance and the "attractiveness" of walking. It is important to note that most of this research was conducted during the COVID19 pandemic, which disproportionally affected parents and caregivers [7] . Therefore, it is even more commendable that these eight teams have been able to contribute to this special issue.

Hogg and colleagues [8] demonstrated that the effect of a cognitive dual-task changes after exercise-induced fatigue. They found that participants had better dual-task cognitive performance during lateral stepping compared to sitting, single-legged stance and walking. Moreover, while cognitive dual-task performance remained relatively stable after a moderateto vigorous intensity 20-min treadmill walking session during sitting, single-legged stance, and walking, there was reduced dual-task performance during lateral stepping. The findings highlight the need to consider motor task and exertion when evaluating cognitive performance.Almaijd and colleagues [9] also focussed on cognitive-dual tasks, showing that performing the dual task of texting while walking had a greater impact on speed outdoors compared to walking indoors. Furthermore, they found that the accuracy of texting did not vary between environments. The findings underscore the need for education on the attentional demands of texting in dynamic, busy environments.Tanabe and colleagues [10] investigated how women modified their walking when asked to walk as attractively as possible. They found that when asked to walk attractive, women show greater energy at the hip joint after ipsilateral foot contact, greater angular disagreement between the thoracolumbar joint and neck, and a more forwards-bended head. Women who were professional models further extended their knee more during the push-off phase and pulled their upper arms backwards. The researchers confirmed the attractiveness of the walking pattern by creating stick figures, which walking patterns were rated on attractiveness by external observers. These findings highlight the complex sociocultural aspects of gait that may influence our observational assessments.

The remaining five articles in this special issue focused on sports and injury biomechanics.Powell and colleagues [11] determined the effect of breast support on knee joint biomechanics during treadmill running. Their results suggest that greater breast support through supportive sports bras resulted in greater knee joint stiffness and knee extension power, and smaller knee flexion excursion. Greater knee joint stiffness has previously been associated with better running performance and lower risk of injury, suggesting that proper breast support may be important for athletes with breasts.Lambrich and Meuhlbauer [12] investigated how plantar pressure changes with ball speed during longline forehand and backhand strokes in elite female tennis players. The results suggest that during forehand strokes, players increased plantar pressure in the dominant foot while decreasing it in the non-dominant foot to achieve higher post-impact ball speeds. Conversely, for backhand strokes, players decreased plantar pressure in both feet to increase ball speed. The study highlights the importance of tailored physical exercises based on foot dominance and stroke technique for enhancing performance in female tennis players.Roper and colleagues [13] compared peak and support joint moment contributions during incline and decline running in people with anterior cruciate ligament (ACL) reconstruction and matched controls. Their results showed no significant differences in joint moment contributions between limbs or groups, indicating that those with ACL reconstruction do not exhibit alterations in joint contributions during sloped running. They showed a change in ankle and knee joint moment contributions from a 10° incline to a 10° decline, suggesting a redistribution of mechanics across lower extremities. The researchers propose that factors other than support joint moment contributions (as assessed in this study) should be explored to understand the increased risk of osteoarthritis in people with ACL reconstruction.Cederbaum, Yoon, and Côté [14] explored the coordination of the vastus medialis and vastus lateralis muscles during repeated sprinting to understand a sex discrepancy in patellofemoral pain syndrome. The results showed similar muscle coordination patterns and onset delays between sexes, with an increase in time delay with repeated sprinting. They observed an earlier plateau in knee extensor muscle activation amplitude in females, while mechanical work plateaued at similar sprint repetitions between sexes. The study suggests that muscle groups other than the vasti may be responsible for females' greater risk of patellofemoral pain syndrome.Kusafuka and colleagues [15] investigated the ability of people with and without baseball experience to pitch at different target positions. Participants with baseball experience exhibited lower variability in pitch location, demonstrating enhanced control over both timing and spatial accuracy. The study highlights the complex motor control mechanisms involved in accurate throwing tasks.

This special issue serves as a testament to the remarkable contributions of women in biomechanics and motor control. The diverse studies, spanning from the effect of cognition and sociocultural nuances on walking to factors associated with elite sportsmanship and injury, showcase the breadth and depth of research undertaken by women in the field. Yet, amidst these triumphs, we cannot ignore the stark reality that women receive 30% fewer citations than men for their scientific publications, a difference persisting from 1950 to today [16] . This discrepancy underlines the pressing need for active promotion of women and their research.A powerful strategy to enhance the visibility of individuals and their research is sponsorship, where the sponsor actively advocates for the protégé. It is different from mentorship, which is about providing guidance and support, fostering skill development, and sharing experiences, in that it involves management of others' view of the protégé and their work. Please join us in supporting and promoting diversity in biomechanics and motor control by actively sponsoring the articles in this special issue and the researchers who contributed them.Let this special issue be a catalyst for change-a reminder that our work does not end with publications but extends to actively shaping an inclusive and supportive community. Through sponsorship, mentorship, and collective efforts, we can pave the way for a future where diversity is not just celebrated but embedded in the fabric of scientific culture.

1,827 views

1 citations

ORIGINAL RESEARCH
17 November 2023
Incline and decline running alters joint moment contributions but not peak support moments in individuals with an anterior cruciate ligament reconstruction and controls
Kenneth Harrison, 4 more and Jaimie A. Roper

3,704 views

8 citations

Increasing breast support is associated with altered knee joint stiffness and contributing knee joint biomechanics during treadmill running
Introduction: Greater breast support has been associated with improved running performance as measured by oxygen cost and running economy. Several candidate mechanisms have been proposed to underlie breast support-related improvements in running performance including increased knee joint stiffness. Greater knee joint stiffness has been associated with improved running performance (speed and metabolic cost), though the influence of breast support on knee joint stiffness has not been previously investigated. Therefore, the purpose of this study was to investigate the influence of increasing breast support on knee joint stiffness and its constituent components during treadmill running. Methods: Thirteen recreational runners performed a 3-minute running bout at their preferred running velocity in each of three breast support conditions: bare chested (CON), low support (LOW) and high support (HIGH) sports bras. Three-dimensional kinematics and ground reaction forces were collected simultaneously using a 10-camera motion capture system (240 Hz, Qualisys Inc.) and instrumented treadmill (1200 Hz, Bertec Inc.). Visual3D (C-Motion Inc.) was used to calculate knee joint excursions, moments, powers and work while custom software (MATLAB) was used to calculate knee joint stiffness and breast displacements during the stance phase of running in each experimental condition. A series of 1 x 3 repeated measures analysis of covariance with post-hoc t-tests was used to evaluate the effect of breast support on knee joint biomechanics during treadmill running. Results: Increasing levels of breast support were associated with greater knee joint stiffness (p=0.002) as a result of smaller knee flexion excursions (p<0.001). Increases in knee extension power (p=0.010) were observed with increasing levels of breast support while no differences were observed in knee extension moments (p=0.202) or work (p=0.104). Conclusions: Greater breast support is associated with increased knee joint stiffness resulting from smaller joint excursions. These findings may provide insight into the biomechanical mechanisms underlying previously reported improvements in running performance including reduced oxygen consumption and greater running economy.

12,785 views

14 citations

Biomechanical strategies to maximize gait attractiveness among women
Physical attractiveness is a key factor in social communication, and through this communication process, we attractively brand and express ourselves. Thus, this study investigated the biomechanical strategies used by women to express gait attractiveness. Our aim was to extend the current literature by examining this aspect of dynamic motion from the perspective of expressed, rather than perceived attractiveness. In this regard, we obtained motion capture data from 17 women, including seven professional fashion models. The participants walked on a treadmill under two conditions: 1) a normal condition in which they were instructed to walk as casually as possible; and 2) an attractive-conscious condition where they were asked to walk as attractively as possible. Then, we used whole-body kinematic data to represent motion energy at each joint, flexibility of the upper body, and the up-down/forward-backward silhouettes of the limbs, and compared these parameters between the two conditions by using statistical parametric mapping. During the attractive-conscious condition, the non-model women increased the energy of the hip and thoracolumbar joints, which emphasized the motions of their bosoms and buttocks. They also increased their upper body flexibility (possibly reflecting fertility) and continued to face front and downward. Conversely, although the fashion models partially shared the same strategy with the non-models (e.g., hip energy, upper body flexibility, and head bending downward), the strategy of the former was prominent in the stretching of the knee during the push-off phase and pulling the upper arm back, allowing them to showcase their youth and emphasize their chests. In addition, the fashion models used a wider variety of strategies to express their gait attractiveness. The findings indicate that the biomechanical strategy used to express gait attractiveness in women involves showcasing femininity, fertility, and youth. Our results not only deepen the understanding of human movement for self-expression through gait attractiveness, but they also help us comprehend self-branding behavior in human social life.

7,602 views

11 citations

Changes in dual-task cognitive performance elicited by physical exertion vary with motor task
ORIGINAL RESEARCH
28 October 2022
Changes in dual-task cognitive performance elicited by physical exertion vary with motor task
Jennifer A. Hogg, 9 more and Gregory D. Myer

5,616 views

14 citations