Biyumikānīk-i varzishī (May 2019)
Comparing the Knee Joint Kinematic Parameters During Landing at Different Minutes of Soccer Game
Abstract
Objective: Background The present research aimed to compare landing kinematics parameters at different minutes of a simulated soccer game. Methods: In total, 15 soccer players from the youth team of Sanay Mes of Kerman with records (2 years) in the Premier League of Iran voluntarily participated in this study. Their mean±SD age and weight were 25.7±2.71 years and 77.30±7.78 kg, respectively. The players followed the Bangsbo's fatigue protocol, i.e. a simulated soccer game. Then, every 15 minutes, the studied players performed two countermovement jumps, and we compared their landing kinematics parameters accordingly. Performances were recorded with 3 cameras, 120 HTZ (Sony A7S). Information extracted from Kinova and repeated-measures analysis of variance was used for data analysis. Results: The obtained results suggested significant differences between the investigated players' knee flexion at landing at minute 0 and minute 60, and other durations (P<0.05). Moreover, there were significant differences between dominant leg knee valgus at minutes 0, 60, and 105, and other durations. No differences were detected between the non-dominant leg knee valgus at different minutes of the game. Conclusion: The obtained data revealed that minutes 0, 60, and 105 of a simulated soccer game are dangerous times for Anterior Cruciate Ligament (ACL) injury in landing task. Moreover, the biomechanics of the dominant leg in the landing tasks demonstrate more changes than the non-dominant leg. Furthermore, ACL injury in the dominant leg is more frequent than the non-dominant one.
