Eschelmuller Gregg, Inglis J Timothy, Kim Hyosub, Chua Romeo
School of Kinesiology, University of British Columbia, Vancouver, BC, Canada.
Graduate Program in Neuroscience, University of British Columbia, Vancouver, BC, Canada.
Exp Brain Res. 2025 Sep 2;243(10):204. doi: 10.1007/s00221-025-07143-3.
Muscle spindles provide critical proprioceptive feedback about muscle length to the central nervous system (CNS). Single muscle tendon vibration can stimulate muscle spindles, causing illusory limb positions, while dual muscle tendon vibration is thought to produce a noisy proprioceptive system. It is currently unclear exactly how the CNS uses kinesthetic feedback from the agonist and antagonist muscles during target-directed reaches. The purpose of the current project was to investigate the effects of agonist, antagonist, and dual agonist/antagonist vibration during target-directed reaching. Using an elbow extension task, we found that antagonist muscle vibration produced an undershooting effect relative to the no-vibration control, while agonist muscle vibration produced an overshooting effect relative to the no-vibration control. Neither of the single muscle vibrations produced any change in the variable error of the movements. While it was originally hypothesized that dual agonist/antagonist vibration would increase participants' variable error with no change in bias, the opposite was found. Participants undershot relative to the no-vibration control with no change in variable error. Overall, the results from this study suggest that dual vibration does not necessarily create a noisy proprioceptive system but can produce a bias in end point.
肌梭向中枢神经系统（CNS）提供有关肌肉长度的关键本体感觉反馈。单根肌腱振动可刺激肌梭，导致肢体位置错觉，而双肌腱振动被认为会产生嘈杂的本体感觉系统。目前尚不清楚中枢神经系统在目标导向的伸手动作过程中究竟如何利用来自主动肌和拮抗肌的动觉反馈。本项目的目的是研究目标导向伸手动作过程中主动肌、拮抗肌以及双主动肌/拮抗肌振动的影响。通过一项伸肘任务，我们发现，与无振动对照组相比，拮抗肌振动产生了欠伸效应，而主动肌振动产生了过伸效应。两种单肌肉振动均未使运动的可变误差发生任何变化。虽然最初假设双主动肌/拮抗肌振动会增加参与者的可变误差且偏差不变，但结果却相反。与无振动对照组相比，参与者出现了欠伸，可变误差没有变化。总体而言，本研究结果表明，双振动不一定会产生嘈杂的本体感觉系统，但会在终点产生偏差。
