This study aimed to investigate biomechanical parameters during a change-of-direction task in college soccer players. Fourteen male and 12 female players performed a 10-m sprint with a 60° change of direction at 5 m. Vertical and mediolateral groundreaction force (GRF) and contact time were measured by having the subjects run in both directions while contacting a force plate with either their preferred (kicking) or nonpreferred leg. Using the midpoint between 2 pelvic markers, further parameters were evaluated: performance cutting angle and horizontal distance. Relationships between parameters, sex, and leg preference were analyzed. Significant correlations emerged between vertical and mediolateral GRF (r= .660–.909) and between contact time and performance cutting angle (r= –.598 to –.793). Sex differences were found for mediolateral GRF (P= .005), performance cutting angle (P= .043), and horizontal distance (P= .020). Leg differences were observed for vertical GRF (P= .029), performance cutting angle (P= .011), and horizontal distance (P= .012). This study showed that a sharper change of direction corresponded to a longer contact time, while no relationships were found with GRF. Moreover, measuring the angle revealed that the real path traveled was different from the theoretical one, highlighting the performance of sharper or more rounded execution. In conclusion, this study showed that specific biomechanical measurements can provide details about the execution of a change of direction, highlighting the ability of the nonpreferred leg to perform better directional changes.

Giancarlo Condello

Thomas W. Kernozek

Antonio Tessitore

Carl Foster

International Journal of Sports Physiology and Performance

国际运动生理学和表现杂志 (IJSPP) 专注于运动生理学和表现，致力于提高运动和运动生理学家、运动表现研究人员和其他运动科学家的知识。该杂志发表运动生理学和相关学科的权威同行评审研究，重点是在提高运动生理学和相关学科的运动表现方面具有直接实际应用的工作。 IJSPP 每年出版 10 期：1 月、2 月、3 月、4 月、5 月、7 月、8 月、9 月、10 月和 11 月。

The International Journal of Sports Physiology and Performance (IJSPP) focuses on sports physiology and performance, aiming to enhance the knowledge of exercise physiologists, sports performance researchers, and other sports scientists. The journal publishes authoritative peer-reviewed research in sports physiology and related fields, with a particular emphasis on work that has direct practical applications for improving sports performance. IJSPP is published 10 times a year, with issues released in January, February, March, April, May, July, August, September, October, and November.

《国际运动生理学和表现杂志》(International Journal of Sports Physiology and Performance) 专注于运动生理学和运动表现，旨在提升运动生理学家、运动表现研究人员及其他运动科学家的专业知识。该杂志发表运动生理学及相关领域的权威同行评审研究，特别强调对提高运动表现具有直接实际应用价值的研究成果。IJSPP 每年出版 10 期，分别在1月、2月、3月、4月、5月、7月、8月、9月、10月和11月发行。

Category	Quartile
医学	2
医学, 生理学	2
医学, 运动科学	2

Biomechanical Analysis of a Change-of-Direction Task in College Soccer Players

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Journal Info

Category	Quartile
SPORT SCIENCES	1