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

Anirban Dutta 1 Michael Nitsche 2
1 DEMAR - Artificial movement and gait restoration
LIRMM - Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier, CRISAM - Inria Sophia Antipolis - Méditerranée
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 < 0.05) and this effect was particularly pronounced at higher force levels. CONCLUSION: 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. KEYWORDS: Recurrence analysis; brain stimulation; electromyography; motor unit; nonlinear analysis; synchronization
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Article dans une revue
Restorative Neurology and Neuroscience, IOS Press, 2015, 〈10.3233/RNN-140469〉
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https://hal.inria.fr/hal-01203368
Contributeur : Anirban Dutta <>
Soumis le : mardi 22 septembre 2015 - 19:15:47
Dernière modification le : mardi 13 novembre 2018 - 10:49:03

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Anirban Dutta, Michael Nitsche. Recurrence quantification analysis of surface electromyogram supports alterations in motor unit recruitment strategies by anodal transcranial direct current stimulation. Restorative Neurology and Neuroscience, IOS Press, 2015, 〈10.3233/RNN-140469〉. 〈hal-01203368〉

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