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http://dx.doi.org/10.9718/JBER.2007.28.5.647

Effects of Vibratory Stimulus on Postural Balance Control during Standing on a Stable and an Unstable Support  

Yu, Mi (Dept. of Biomedical Engineering, Graduate School, Chonbuk National Univ.)
Eun, Hey-In (Dept. of Healthcare Engineering, Graduate School, Chonbuk National Univ.)
Kim, Dong-Wook (Division of Biomedical Engineering, College of Engineering, Chonbuk National Univ.)
Kwon, Tae-Kyu (Division of Biomedical Engineering, College of Engineering, Chonbuk National Univ.)
Kim, Nam-Gyun (Division of Biomedical Engineering, College of Engineering, Chonbuk National Univ.)
Publication Information
Journal of Biomedical Engineering Research / v.28, no.5, 2007 , pp. 647-656 More about this Journal
Abstract
The purpose of this study was to analyze the effects of vibratory stimulus as somatosensory inputs on the postural control in human standing. To study these effects, the center of pressure(COP) was observed while subjects were standing on a stable and an unstable support with co-stimulated mechanical vibrations to flexor ankle muscles(tibialis anterior tendon, achilles tendon) and two plantar zones on both foot. The COP sway measurement was repeated twice in four conditions: (1) with visual cue and vibration, (2) without visual cue and vibration, (3) with visual cue and without vibration, (4) without visual cue and with vibration. The calculated parameters were the COP sway area and the distance, the median frequency and the spectral energy of COP sway in three intervals $0.1{\sim}0.3,\;0.3{\sim}1,\;1{\sim}3Hz$. The results showed that vibratory stimulus affect postural stability. The reduction rate of the COP sway with vibratory stimulus were higher on the unstable support because the effect of postural stability increases when afferent nervous flow is more activated by vibration on unstable support. If unclear visual or vibratory information is received, one type of information is compared with the other type of sensory information. Then the input balance between visual and vibratory information is corrected to maintain postural stability. These findings are important for the rehabilitation system of postural balance control and the use of vibratory information.
Keywords
vibratory stimulus; somatosensory; postural control; unstable support;
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