片脚立位時の矢状面上における足圧中心位置の違いが股関節周囲筋の筋活動に与える影響

抄録

This study examined how differences in the center of foot pressure in the sagittal plane affect the activity of muscles surrounding the hip joint in healthy young male subjects. With the subjects standing on one leg, integrated electromyography values of the muscles surrounding the hip joint, the point of center of pressure in the sagittal plane (Y-axis center displacement), and the trace length of the center of pressure in the frontal plane (X-axis trace length) were measured for three different loads with the center of foot pressure in the forefoot, midfoot and hindfoot regions. There was no significant difference in X-axis trace length between the three loading conditions. The activities of the rectus femoris, tensor fasciae latae and adductor magnus muscles were higher when the load was borne on the hindfoot than in the other two loading conditions. This indicates that these muscles have a flexor effect on the hip joint in the sagittal plane, and that they control the posterior movement of the center of gravity of the body. In addition, we consider these muscles control the center of gravity of the body in the coronal plane at the hip joint.