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

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Title: Muscle synergies in preparation to a step made with obstacle in elderly individuals
Authors: Wang, Yun Browse this author
Watanabe, Kazuhiko Browse this author
Asaka, Tadayoshi Browse this author →KAKEN DB
Keywords: Anticipatory synergy adjustments
Step initiation
Issue Date: 4-Feb-2015
Publisher: Biomed Central
Journal Title: Journal of Neuroengineering and Rehabilitation
Volume: 12
Issue: 1
Start Page: 10
Publisher DOI: 10.1186/s12984-015-0005-9
PMID: 25656738
Abstract: 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 (Delta V) changes in the elderly emerged later (100 ms prior to t(0)) 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.
Type: article
Appears in Collections:保健科学院・保健科学研究院 (Graduate School of Health Sciences / Faculty of Health Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 浅賀 忠義

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