Matsugi Akiyoshi, Oku Kosuke, Mori Nobuhiko
Faculty of Rehabilitation, Shijonawate Gakuen University, Daitou, Japan.
Department of Rehabilitation, Kawasaki University of Medical Welfare, Kurashiki, Japan.
Front Hum Neurosci. 2020 Dec 14;14:591671. doi: 10.3389/fnhum.2020.591671. eCollection 2020.
This study aimed to investigate whether galvanic vestibular stimulation with stochastic noise (nGVS) modulates the body sway and muscle activity of the lower limbs, depending on visual and somatosensory information from the foot using rubber-foam. Seventeen healthy young adults participated in the study. Each subject maintained an upright standing position on a force plate with/without rubber-foam, with their eyes open/closed, to measure the position of their foot center of pressure. Thirty minutes after baseline measurements under four possible conditions (eyes open/closed with/without rubber-foam) performed without nGVS (intensity: 1 mA, duration: 40 s), the stimulation trials (sham-nGVS/real-nGVS) were conducted under the same conditions in random order, which were then repeated a week or more later. The total center of pressure (COP) path length movement (COP-TL) and COP movement velocity in the mediolateral (Vel-ML) and anteroposterior (Vel-AP) directions were recorded for 30 s during nGVS. Furthermore, electromyography activity of the right tibial anterior muscle and soleus muscle was recorded for the same time and analyzed. Three-way analysis of variance and multiple comparison revealed a significant increment in COP-related parameters by nGVS, and a significant increment in soleus muscle activity on rubber. There was no significant effect of eye condition on any parameter. During nGVS (1 mA), body sway and muscle activity in the lower limb may be increased depending not on the visual condition, but on the foot somatosensory condition.
本研究旨在探讨采用随机噪声的电前庭刺激（nGVS）是否会根据使用橡胶泡沫从足部获取的视觉和体感信息来调节身体摆动和下肢肌肉活动。17名健康的年轻成年人参与了该研究。每位受试者在有/无橡胶泡沫的情况下，睁眼/闭眼，在测力板上保持直立站立姿势，以测量其足部压力中心的位置。在无nGVS（强度：1 mA，持续时间：40 s）的四种可能条件（睁眼/闭眼有/无橡胶泡沫）下进行基线测量30分钟后，在相同条件下以随机顺序进行刺激试验（假nGVS/真nGVS），然后在一周或更长时间后重复进行。在nGVS期间记录30秒的总压力中心（COP）路径长度移动（COP-TL）以及在内外侧（Vel-ML）和前后方向（Vel-AP）上的COP移动速度。此外，同时记录右胫骨前肌和比目鱼肌的肌电图活动并进行分析。三因素方差分析和多重比较显示，nGVS使COP相关参数显著增加，且在橡胶上比目鱼肌活动显著增加。眼部状况对任何参数均无显著影响。在nGVS（1 mA）期间，下肢的身体摆动和肌肉活动可能会增加，这并非取决于视觉状况，而是取决于足部的体感状况。
