Yasuto Inukai1, Naofumi Otsuru2, Mitsuhiro Masaki2, Kei Saito2, Shota Miyaguchi2, Sho Kojima2, Hideaki Onishi2. 1. 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. Electronic address: inukai@nuhw.ac.jp. 2. 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.
Abstract
BACKGROUND: 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. OBJECTIVE: 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. METHODS: 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. RESULTS: 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). CONCLUSIONS: These findings suggest that nGVS improves postural sway in an open-eye standing posture among young subjects.
BACKGROUND: 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. OBJECTIVE: 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. METHODS: 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. RESULTS: 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). CONCLUSIONS: These findings suggest that nGVS improves postural sway in an open-eye standing posture among young subjects.
Authors: Ananda A Santana-Ribeiro; Giulliani A Moreira-Brasileiro; Manuel H Aguiar-Oliveira; Roberto Salvatori; Vitor O Carvalho; Claudia K Alvim-Pereira; Carlos R Araújo-Daniel; Júlia G Reis-Costa; Alana L Andrade-Guimarães; Alécia A Oliveira-Santos; Edgar R Vieira; Miburge B Gois-Junior Journal: Endocr Connect Date: 2019-04 Impact factor: 3.335