Jizokusei Kin Shushukuchu Ni Mirareru Kin Hoden No Kyushi Ni Kakawaru Kin Bosui Kyushinsei Hassha Katsudo (Contribution of Muscle Spindle Afferent Activity to Transient Pause in EMG During Voluntary Tonic Contraction)
(English)
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The purpose of this study is to examine how discharge of afferent fibers contributes to the pause emerging incidently in electromyogram (EMG) during voluntary tonic contraction. The subjects were five healthy adults, who lied in the prone position with isometric plantar flexion, and EMG and electroneurogram were recorded to identify afferent discharge of muscle spindle and Golgi tendon organ. As a result, the afferent discharge of muscle spindle was paused or grouped before muscle discharge paused. The muscle spindle afferent discharge was not relevant to restart of muscle discharge, at least through spinal reflex pathway. In addition, although discharge of muscle spindle tended to group before pauses of muscle discharge, the tendency disappeared after the pauses. The EMG of Golgi tendon organ revealed that discharge was decreased during muscle discharge pause as well as before restart of muscle discharge. This suggests that decrease of inhibitory stimulus from Golgi tendon organ may contribute to muscle discharge after the restart.
Jizokusei Kin Shushukuchu Ni Mirareru Kin Hoden No Kyushi Ni Kakawaru Kin Bosui Kyushinsei Hassha Katsudo (Contribution of Muscle Spindle Afferent Activity to Transient Pause in EMG During Voluntary Tonic Contraction)