Background During voluntary muscle contraction, sensory information induced by electrostimulation of the nerves supplying the contracting muscle is inhibited and the somatosensory evoked potentials (SEPs) amplitude decreases. This depression of sensory input during voluntary muscle contraction has been demonstrated by many studies using electrophysiological methods. However, the association between the electrophysiological response of the sensory system during sustained muscle contraction and subjective peripheral sensation (SPS) is still unclear. The aim of this study was to investigate changes in spinal excitability, SEPs, and SPS during voluntary muscle contraction. Results The appearance rate of the F-wave was significantly higher during muscle contraction than rest, whereas no significant difference was observed in F-wave latency between muscle contraction and rest. Furthermore, the P25 amplitude of SEPs was significantly lower during muscle contraction than rest, whereas the N20 amplitude of SEPs exhibited no significant differences. The SPS was significantly lower during muscle contraction than rest Conclusions We conclude that sensory gating, which is found in the P25 component of SEPs during muscle contraction, is one of the neurophysiological mechanisms underlying the suppression of SPS.

中文翻译：

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随意肌肉收缩期间主观外周感觉的感觉门控和抑制

背景在随意肌肉收缩期间，由供应收缩肌肉的神经的电刺激引起的感觉信息受到抑制，并且体感诱发电位 (SEP) 幅度降低。许多使用电生理学方法的研究已经证明了这种在随意肌肉收缩期间感觉输入的抑制。然而，持续肌肉收缩期间感觉系统的电生理反应与主观外周感觉 (SPS) 之间的关联仍不清楚。本研究的目的是调查随意肌肉收缩期间脊柱兴奋性、SEP 和 SPS 的变化。结果肌肉收缩时F波的出现率明显高于休息时，而肌肉收缩和休息之间的 F 波潜伏期没有观察到显着差异。此外，肌肉收缩期间 SEP 的 P25 幅度明显低于休息期间，而 SEP 的 N20 幅度没有显着差异。肌肉收缩期间的 SPS 显着低于休息时 结论 我们得出结论，肌肉收缩期间 SEP 的 P25 成分中发现的感觉门控是抑制 SPS 的神经生理机制之一。