Influence of Active Fingertip Contact with a Stable Surface on Postural Sway and Electromyographic Activities of the Lower Extremity Muscles Immediately after Descending a Step
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概要
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Recent studies have shown that active contact cues from a fingertip provide information that leads to reduced postural sway during static standing. Although the falling risk increases immediately after descending a step, little is known about the influence of active fingertip contact with a stable surface. The purpose of this study was to investigate the influence of fingertip contact on the sway and the EMG (Electromyographic) activities of lower extremity muscles immediately after descending a step. Nine healthy male volunteers participated in this study. Sway was measured by the center of pressure (COP) and compared under three conditions: (1) standing without touching, (2) standing with the right index fingertip lightly touching (<1N), and (3) standing forcefully touching (5~10N). EMG activities were measured associated with sway and compared. More areas of COP were observed while standing without touching than while standing with light or forceful touching, but there was no significant difference between the two touching conditions. No significant differences in the length of COP and the EMG activities were observed among the three conditions. The results suggested that the fingertip touch contact with a stable surface decreased sway immediately after descending a step by finely controlling the lower extremity muscles.
著者
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Osaka Hiroshi
Department Of Rehabilitation Faculty Of Health Science And Technology Kawasaki University Of Medical
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Kobara Kenichi
Department Of Rehabilitation Faculty Of Health Science And Technology Kawasaki University Of Medical
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Watanabe Susumu
Department Of Chemistry College Of Science And Engineering Aoyama Gakuin University
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Yoshimura Yosuke
Department Of Chemistry Faculty Of Science Kyoto University
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Ishida Hiroshi
Department Of Agricultural Chemistry Faculty Of Agriculture Tohoku University
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Watanabe Susumu
Department Of Rehabilitation Faculty Of Health Science And Technology Kawasaki University Of Medical Welfare
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Osaka Hiroshi
Department Of Rehabilitation Faculty Of Health Science And Technology Kawasaki University Of Medical Welfare
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Ishida Hiroshi
Department Of Rehabilitation Faculty Of Health Science And Technology Kawasaki University Of Medical Welfare
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Watanabe Susumu
Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
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