The Compression of maximum Angular Velocity and Torque of Lower Extremity Joints during Consecutive Soccer Instep Kick

The purpose of this study was to investigate the number of trials necessary to obtain optimal biomechanical responses of lower extremity joints during 10 consecutive soccer instep kicks. The kicking motions of dominant legs were captured from 15 professional adult male soccer players using six synchronized high-speed infra-red cameras at 200 Hz. Some of the important biomechanical parameters are maximum hip and knee angular velocity, maximum of hip and knee moment, at forward and impact phases and finally maximum ball velocity after impact selected to be analysed. There was a significant decrease of ball velocity between the first and the fifth kick and the subsequent kicks. Similarly, the knee angular velocity showed a significant decrease after the fifth kick and thereafter. Comparing to the first kick the hip angular velocity has been shown to decrease after the sixth kick and thereafter and the hip moment result of the sixth kick was significantly lower when compared to the first kick. Moreover, the knee moment result of the fourth kick was significantly lower in comparison with the first kick. In conclusion, it seems that five consecutive kicks are adequate to achieve high biomechanical responses and selecting more than five kicks will be unusual.