经颅直流电刺激
递归量化分析
肱二头肌
电机单元
物理医学与康复
运动皮层
初级运动皮层
肌电图
刺激
心理学
神经科学
医学
量子力学
物理
非线性系统
作者
Anirban Dutta,Chandramouli Krishnan,Shailesh Kantak,Rajiv Ranganathan,Michael A. Nitsche
出处
期刊:Restorative Neurology and Neuroscience
[IOS Press]
日期:2015-10-05
卷期号:33 (5): 663-669
被引量:10
摘要
Recent evidence indicates that anodal transcranial direct current stimulation (tDCS) can selectively alter the EMG/force relationship of agonist arm muscles; however, the mechanisms mediating those changes are less clear. The purpose of this study was to evaluate the effect of anodal tDCS on motor unit synchronization by using a sophisticated non-linear EMG analysis called recurrence quantification analysis (RQA).Surface EMG signals were collected from the biceps brachii muscle of eighteen healthy young adults (9 tDCS and 9 control) at various force levels (12.5%, 25%, 37.5%, and 50% maximum) before and after the application of anodal tDCS over the primary motor cortex. RQA was employed to quantify the changes in percentage of determinism (% DET) and laminarity (% LAM) of the surface EMG signals, which are surrogate measures of motor unit synchronization.RQA analyses indicated that the changes in % DET and % LAM scores were significantly higher in the tDCS group than in the control group (p < 0.05) and this effect was particularly pronounced at higher force levels.The results of this study provide novel evidence supporting that anodal tDCS significantly alters motor unit firing strategies (i.e., the degree of synchronization) of the biceps brachii muscle.
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