Implement sports

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The purposes of this study were to investigate the influence of foot rotation angle on trunk rotational strength and physical quantity to rotate the body. Ten healthy males participated in this study who exerted the maximum trunk rotational strength in a standing posture on the conditions of five different foot rotation angles based on “the central angle” that was defined as the average of the maximum internal- and external-rotation of hip joint in a static standing. The force was measured by force gauge sensor. Biomechanical analysis was performed with an optical motion capture system and two force plates. No significant difference was observed in the rotational strength between any conditions, but as the foot rotation angle increased externally, the free moment acting on the right foot decreased and the moment around the center of mass by the ground reaction forces acting on both feet increased.