予測的外乱負荷に伴う運動調節機構の応答性

概要

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Normal human subjects (n=6), sitting on a chair, were required to maintain stable elbow flexion angle (90 degrees) against loadings of 0.5 kg or 2 kg. Loading was affected either 'without anticipation (without-A)' by the experimenter or 'with anticipation (with-A)' by the subejct's own contra-lateral hand. Acceleration of the forearm movement by the loading (extension) and EMG of biceps (BB) and triceps (TB) brachii muscles were recorded. Under 'with-A' condition, preceding EMG activities of BB and TB before onset time of loading (perturbation on BB) were clearly observed. Furthermore, amount of those preceding EMG activities was larger in 2 kg loading than that in 0.5kg. Under 'without-A' condition, however, those preceding EMG activities were not observed. On behalf of those preceding EMG activities, EMG burst (latency; 20 ms) of presumed stretch reflex induced by loading were early observed. Thus, anticipatory adjustment of elbow angle, observed when loading was performed by the subject, appears to optimize limb stability during the mechanical perturbation.
広島修道大学の論文
1999-03-31