足関節運動における角速度の変化と下腿三頭筋の活動パターン

概要

論文の詳細を見る
Surface electromyograms (EMG_S) were recorded from the triceps surae muscles in order to examine muscle activities during concentric and eccentric ankle joint movements at various angular velocities under constant load (5 and 10%MVC). The results were summarized as follows ; 1)At slow angular velocity (6 deg/s) of ankle joint movement, EMG amplitude tended to increase at a larger ankle joint angle in the gastrocnemius muscle, and at a smaller angle in the soleus muscle. 2)Following an increase in angular velocities (6→30→60 deg/s), peak values of integrated EMGs were significantly increased (7〜15%) in the medial gastrocnemius muscle. However, these peak values were significantly decreased in the soleus muscle (22〜49%). These results suggest selective recruitment of motor units depending on angular velocity. 3)Ankle joint angle at the peak integrated EMGs was significantly increased following an increase in angular velocity (6→30→60 deg/s) in soleus muscle. This suggests that the angle at the recruitment of motor units may be dependent on angular velocity in the soleus muscle.
日本体力医学会の論文
1993-06-01