The ground reaction force in jump-landing maneuver after soccer specific fatigue protocol (SAFT90) in elite soccer players

Abstract

Background: The aim of this study was to investigate effect of fatigue protocol on vertical ground reaction forces absorption in soccer players and study injury mechanism emergent of it. Methods: 12 health elite soccer players participated in this study. Subjects performed jump-landing at pre, mid and post soccer specific fatigue protocol (SAFT90). Peak vertical ground reaction forces and rate of loading measured by one force plate. Results: 12 healthy subjects (Age: 21.42 ± 2.05 years; Height: 174.91 ± 5.03 cm; Weight: 70.7 ± 5.27 kg) were studied. The significant difference had shown between pre-test and post-test fatigue protocol and between mid-test and post-test fatigue protocol in rate of loading (p˂0.05) but between pre-test and mid-test were not significant (p˂0.05). Also the difference of peak vertical ground reaction forces just between pre-test and post-test fatigue protocol were significant (p˂0. 05) but between other groups were not significant (p˂0.05). Conclusions: After 90 minute simulated soccer activity seems decreases the player’s ability to control forces incur on those. This decrease could because of fatigue in lower extremity muscles especially in quadriceps muscles that have an important role in forces absorption and the procedure could increase pressure on the other tissues and increase risk of injury, such as non-contact ACL injury, at the end of 90 minute of soccer match.