A15 Kinematics of foot joint at ball impact in soccer

TL;DRAbstract

The purpose of this study is to analyze the interaction of foot joint and the ball at instep kicking by different impact point using the high speed video camera (4,500fps). Moreover, we analyzed the kinematics on ball kicking with shoe and without shoe condition. It is tendency that the swing speed before impact of toe point is larger than that of near ankle joint. The ball speed after impact of the far points were smaller than that of the near and the middle points. In the case with shoe, both swing speeds and the ball speeds indicate a low value compared with the case without shoe. In the case with shoe, the mean of repulsion rate of NIP was 1.30, that of MIP was 1.17 and that of FIP was 1.16. In the case of without shoe, the mean of repulsion rate of NIP was 1.51, that of MIP was 1.41 and that of FIP was 1.22. It is considered that the energy loss of the material of a shoe surface is one of the important factors for increasing ball speed.

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