Motor unit rate coding is severely impaired during forceful and fast muscular contractions in individuals post stroke

Li Wei Chou, Jacqueline A. Palmer, Stuart Binder-Macleod, Christopher A. Knight

研究成果: Article同行評審

52 引文 斯高帕斯(Scopus)

摘要

Information regarding how motor units are controlled to produce forces in individuals with stroke and the mechanisms behind muscle weakness and movement slowness can potentially inform rehabilitation strategies. The purpose of this study was to describe the rate coding mechanism in individuals poststroke during both constant (n = 8) and rapid (n = 4) force production tasks. Isometric ankle dorsiflexion force, motor unit action potentials, and surface electromyography were recorded from the paretic and nonparetic tibialis anterior. In the paretic limb, strength was 38% less and the rate of force development was 63% slower. Linear regression was used to describe and compare the relationships between motor unit and electromyogram (EMG) measures and force. During constant force contractions up to 80% maximal voluntary contraction (MVC), rate coding was compressed and discharge rates were lower in the paretic limb. During rapid muscle contractions up to 90% MVC, the first interspike interval was prolonged and the rate of EMG rise was less in the paretic limb. Future rehabilitation strategies for individuals with stroke could focus on regaining these specific aspects of motor unit rate coding and neuromuscular activation.

原文English
頁(從 - 到)2947-2954
頁數8
期刊Journal of Neurophysiology
109
發行號12
DOIs
出版狀態Published - 15 6月 2013

指紋

深入研究「Motor unit rate coding is severely impaired during forceful and fast muscular contractions in individuals post stroke」主題。共同形成了獨特的指紋。

引用此