Recurrence quantification analysis of surface electromyogram supports alterations in motor unit recruitment strategies by anodal transcranial direct current stimulation.

Recurrence quantification analysis of surface electromyogram supports alterations in motor unit recruitment strategies by anodal transcranial direct current stimulation. Restor Neurol Neurosci. 2015;33(5):663-9 Authors: Dutta A, Krishnan C, Kantak SS, Ranganathan R, Nitsche MA Abstract PURPOSE: 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). METHODS: 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. RESULTS: RQA analyses indicated that the changes in % DET and % LAM scores were significantly higher in the tDCS group than in the control group (p
Source: Restorative Neurology and Neuroscience - Category: Neurology Tags: Restor Neurol Neurosci Source Type: research

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