Muscle synergies in preparation to a step made with obstacle in elderly individuals

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• 作者：Yun Wang ; Kazuhiko Watanabe ; Tadayoshi Asaka
• 关键词：Anticipatory synergy adjustments ; Synergies ; Step initiation ; Obstacle ; Elderly
• 刊名：Journal of NeuroEngineering and Rehabilitation
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：12
• 期：1
• 全文大小：1,285 KB
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• 刊物主题：Neurosciences; Neurology; Rehabilitation Medicine; Biomedical Engineering;
• 出版者：BioMed Central
• ISSN：1743-0003

文摘

Background To evaluate if multi-muscle synergies are comprised of flexible combinations of a small number of postural muscles to stabilize the center of pressure (COP) shift during preparation to making a step in the elderly (self-paced level stepping vs. obstacle crossing stepping). Methods Electromyography (EMG) signals of leg and trunk muscles were recorded. Linear combination of integrated indices of muscle activity (M-modes) and their relationship to changes in the COP shift in the anterior-posterior (AP) direction were first determined. Uncontrolled manifold (UCM) analysis was performed to determine the extent to which variance of the M-modes acted to produce a consistent change in the COP displacement. Results The elderly were capable of stabilizing the COPAP coordinate based on co-varied involvement of the M-modes. The synergy index (?V) changes in the elderly emerged later (100?ms prior to t0) and its magnitude was smaller as compared to that reported in younger persons. Conclusions Our study reveals that aging is associated with a preserved ability to explore the flexibility of the M-mode compositions but a decrease ability to use multi-M-mode synergies following a predictable perturbation.