Examination ofgeneration mechanisms behind corticomuscular coherence from a standpoint of somatosensory afferent feedback

点击翻译按钮获取中文摘要

This study aimed to examine the contribution of somatosensory afferent feedback to generation of corticomuscular coherence observed during tonic isometric voluntary contraction. As results, I have obtained following findings:1) The magnitude of corticomuscular coherence was decreased after prolonged tendon vibration, which is known as a technique attenuating Ia afferent feedback, in half of the participants;2) Involuntary muscle activity induced by muscle or tendon vibration, so-called “tonic vibration reflex”, was significantly coupled with electroencephalogram activity over the sensorimotor cortex at around 20 Hz;3) motor unit activities during tonic vibration reflex could be divided into the firing derived from spinal stretch reflex loop and the one derived from efferent input from the cortex.