筋力発揮直後の微小な力制御における補正的筋制御

概要

論文の詳細を見る
EMG activities of human biceps brachii following a 5-s 25 or 5% maximum voluntary contraction (MVC) were increased while the subject tried to maintain a 2% criterion force for 30-60s (Suzuki et al. 1988). Under these conditions, force maintenance activation levels of flexors and extensors in arm muscles must be altered to accommodate, and likewise, such alterations should be detected in force trace. To determine if the changes in EMG activities of the above mentioned muscles and force fluctuation occur in similar experiments, surface EMG activities and force trace were recorded from 8 active human subjects. EMG was recorded from the biceps brachii, triceps brachii, brachioradialis, flexor carpi ulnaris, palmaris longus, extensor carpi radialis longus, extensor carpi ulnaris and the extensor digitorum. It was found that most EMG activities for both flexors and extensors tended to be increased following a 5-s 50% MVC, and showed considerably stronger co-activation. Postcontraction increases in fluctuation of 2% MVC force traces were also seen, and the amplitude spectrum showed increasing amplitude, especially at less than 1.5 Hz frequency component, comparedwith the control contraction amplitude spectrum. It was speculated that the increased force fluctuation in the postcontraction period might be a reflection of tension rivalry between the extensors and flexors.
早稲田大学の論文
1992-03-25