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Open AccessArticle

Vibrotactile Stimulation of Nail of Hallux during Walking: Effect on Center-of-Mass Movement in Healthy Young Adults

1
Digital Human Research Team, Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology, 2-3-26, Aomi, Koto, Tokyo 1350064, Japan
2
Department of Intelligence Interaction Technology, Tsukuba University, 1-1-1 Tennoudai, Tsukuba, Ibaraki 3058573, Japan
3
JST, PREST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(13), 4562; https://doi.org/10.3390/app10134562
Received: 25 May 2020 / Revised: 26 June 2020 / Accepted: 28 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Haptics: Technology and Applications)
Previous studies have reported that vibrotactile stimulation of the nail of the hallux decreases the variability of the center-of-mass (CoM) movement in the lateral direction in subjects performing unsteady walking on the spot. This study investigated the effect of vibrotactile stimulation of the nail of the hallux on the CoM movement during walking. Healthy young males were asked to walk with and without stimulation, and their CoM was measured. The intrasubject mean and coefficient of variation (CV) of their walking speed, stance time, and CoM movement were evaluated. The differences between the variables with and without stimulation were determined, and the baseline-dependent effects of the stimulation on these variables were analyzed. It was observed that stimulation had a negative baseline-dependent effect on the CVs of the walking speed, stance time, and the CoM movement in the lateral direction. In particular, stimulation decreased the CV of the CoM movement in the lateral direction for subjects with a greater variability. Vibrotactile stimulation of the nail of the hallux can reduce the variability of the lateral displacement of the CoM movement in healthy young subjects who otherwise show a large variability of the CoM movement during walking without stimulation. View Full-Text
Keywords: vibrotactile stimulation; gait; center-of-mass; variability; rehabilitation; nail of hallux vibrotactile stimulation; gait; center-of-mass; variability; rehabilitation; nail of hallux
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Toda, H.; Hashimoto, Y.; Tada, M. Vibrotactile Stimulation of Nail of Hallux during Walking: Effect on Center-of-Mass Movement in Healthy Young Adults. Appl. Sci. 2020, 10, 4562.

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