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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Health Sciences / Faculty of Health Sciences >
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Muscle synergies in preparation to a step made with obstacle in elderly individuals
This item is licensed under:Creative Commons Attribution 4.0 International
| 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 | | Synergies | | Step initiation | | Obstacle | | Elderly |
| 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. |
| Rights: | http://creativecommons.org/licenses/by/4.0 |
| Type: | article |
| URI: | http://hdl.handle.net/2115/58428 |
| 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)
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Submitter: 浅賀 忠義
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