[Purposes] To investigate angular changes in the ankle joint and leg muscle activities during toe-gripping, and to examine the relationship between these changes and toe-gripping strength. [Subjects] Eleven healthy young women were selected. [Methods] We measured the toe-gripping strength, angular changes in the ankle joint, and leg muscle activities of all patients during toe-gripping. [Results] The mean change in the ankle angle in dorsiflexion from a neutral position was 3°, and a positive correlation was observed between this angle and toe-gripping strength (r = 0.61). Thus, toe-gripping strength increased with the angle of dorsiflexion. Regarding the leg muscle activities, activities of the tibialis anterior muscle and medial head of the gastrocnemius muscle demonstrated positive correlations with toe-gripping strength (r = 0.75 and r = 0.72, respectively). [Conclusion] These findings suggest that the ankle dorsiflexes in order to exert great toe-gripping strength, and the crural muscles contract simultaneously because of ankle fixation.
健常女性11名を対象に、つま先立ち時の足関節の角度変化と下肢筋活動を調査し、これらの変化とつま先立ちの強さとの関係を検討した。足関節背屈時の中立位からの角度変化の平均値は3°であり、この角度とつま先立ちの強さには正の相関が認められた。つま先立ちの強さは背屈角度が大きくなるにつれて増加することがわかった。また、下肢筋活動では、前脛骨筋、腓腹筋内側頭部に正の相関がみられた。以上から、足関節は大きなつま先立ちの力を発揮するために背屈し、足関節が固定されることによって、同時に腓腹筋が収縮することが示唆された。
27(6) 1957 - 1960
Soma M, Murata S, Kai Y, Nakae H, Satou Y, Murata J, Miyazaki J
