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   Muscle synergies in preparation to a step made with obstacle in elderly individuals  
   
نویسنده wang y. ,watanabe k. ,asaka t.
منبع journal of neuroengineering and rehabilitation - 2015 - دوره : 12 - شماره : 1
چکیده    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 (δv) 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. © 2015 wang et al.; licensee biomed central.
کلیدواژه Anticipatory synergy adjustments; Elderly; Obstacle; Step initiation; Synergies
آدرس tianjin key lab of exercise physiology and sports medicine,department of health and exercise science,tianjin university of sport,51 weijin south street,hexi district,tianjin,300381, China, institute of sports and health science,3-10-31,kagamiyama,higashi-hiroshima,hiroshima,739-0046, Japan, department of rehabilitation science,faculty of health sciences,hokkaido university,n12-w5,sapporo,kita-ku,060-0826, Japan
 
     
   
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