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

本研究旨在探讨在紧张性等长自愿收缩过程中观察到的体感传入反馈对皮质肌相干性产生的贡献。结果，我得到了以下发现：1)在一半的参与者中，在长时间的肌腱振动后，皮质肌肉相干性的大小下降，这被称为传入反馈的技术衰减；2)由肌肉或肌腱振动引起的不随意肌活动，即所谓的“强直振动反射”，在20 Hz左右与感觉运动皮层的脑电图活动显著相关；(3)强直性振动反射过程中的运动单元活动可分为脊髓拉伸反射环路引起的放电和皮层输出输入引起的放电。

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.