Inukai Yasuto, Otsuru Naofumi, Masaki Mitsuhiro, Saito Kei, Miyaguchi Shota, Kojima Sho, Onishi Hideaki
Department of Physical Therapy, Niigata University of Health and Welfare, 1398 Shimami-cho, Kita-ku, Niigata City, Niigata, Japan; Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, 1398 Shimami-cho, Kita-ku, Niigata City, Niigata, Japan.
Department of Physical Therapy, Niigata University of Health and Welfare, 1398 Shimami-cho, Kita-ku, Niigata City, Niigata, Japan; Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, 1398 Shimami-cho, Kita-ku, Niigata City, Niigata, Japan.
Brain Stimul. 2018 Jan-Feb;11(1):85-93. doi: 10.1016/j.brs.2017.10.007. Epub 2017 Oct 17.
The vestibular system is involved in the control of standing balance. Galvanic vestibular stimulation (GVS) is a noninvasive technique that can stimulate the vestibular system. In recent years, noisy GVS (nGVS) using noise current stimulation has been attempted, but it has not been clarified whether it affects postural sway in open-eye standing.
The purpose of this study was to clarify the influence of nGVS on the center of pressure (COP) sway measurement in open-eye standing postural control and identify the responders of nGVS.
nGVS (0.1-640 Hz) was delivered at 0.4 and 1.0 mA over the bipolar mastoid. COP sway root mean square area, sway path length, medio-lateral (ML) mean velocity, and antero-posterior (AP) mean velocity before and during nGVS in an open-eye standing posture was measured.
nGVS at 0.4 and 1.0 mA significantly reduced sway path length, mean velocity. The stimulation effect of nGVS was also large in subjects with a long sway path. For subjects with high COP sway of Baseline, nGVS was effective even with stimulation for a short duration (5 s).
These findings suggest that nGVS improves postural sway in an open-eye standing posture among young subjects.
前庭系统参与站立平衡的控制。电刺激前庭（GVS）是一种可刺激前庭系统的非侵入性技术。近年来，已尝试使用噪声电流刺激的噪声GVS（nGVS），但尚未阐明其是否会影响睁眼站立时的姿势摆动。
本研究旨在阐明nGVS对睁眼站立姿势控制中压力中心（COP）摆动测量的影响，并确定nGVS的反应者。
在双极乳突上以0.4和1.0 mA施加nGVS（0.1 - 640 Hz）。测量睁眼站立姿势下nGVS刺激前之前和期间的COP摆动均方根面积、摆动路径长度、中外侧（ML）平均速度和前后（AP）平均速度。
0.4和1.0 mA的nGVS显著缩短了摆动路径长度和平均速度。对于摆动路径长的受试者，nGVS的刺激效果也较大。对于基线时COP摆动较大的受试者，即使短时间（5秒）刺激nGVS也有效。
这些发现表明，nGVS可改善年轻受试者睁眼站立姿势下的姿势摆动。
