Department of Sport Social Management, KIBI International University, 8 Igamachi, Takahashi, Okayama, 716-8508, Japan.
Department of Human Health and Wellbeing, University of Marketing and Distribution Science, Kobe. 3-1 Gakuen-Nishimachi, Nishi-ku, Kobe, Hyogo, 651-2188, Japan.
BMC Neurosci. 2020 Oct 1;21(1):41. doi: 10.1186/s12868-020-00592-2.
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.
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.
在自愿肌肉收缩期间，供应收缩肌肉的神经电刺激引起的感觉信息受到抑制，体感诱发电位（SEP）的幅度减小。许多使用电生理方法的研究已经证明了这种在自愿肌肉收缩期间感觉输入的抑制。然而，感觉系统在持续肌肉收缩期间的电生理反应与主观外周感觉（SPS）之间的关联尚不清楚。本研究旨在研究自愿肌肉收缩期间脊髓兴奋性、SEP 和 SPS 的变化。
与休息相比，肌肉收缩时 F 波的出现率显著升高，而 F 波潜伏期在肌肉收缩和休息之间无显著差异。此外，SEP 的 P25 振幅在肌肉收缩期间显著低于休息时，而 SEP 的 N20 振幅则没有显著差异。与休息时相比，肌肉收缩时的 SPS 显著降低。
我们得出结论，感觉门控是肌肉收缩时 SEP 的 P25 成分中的一种神经生理机制，是抑制 SPS 的机制之一。
