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Recurrence quantification analysis of surface electromyogram supports alterations in motor unit recruitment strategies by anodal transcranial direct current stimulation
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.
Cited literature [15 references]
https://hal.inria.fr/hal-01203368
Contributor : Anirban Dutta Connect in order to contact the contributor
Submitted on : Friday, May 17, 2019 - 12:29:00 PM
Last modification on : Monday, October 11, 2021 - 1:24:13 PM
Contributor : Anirban Dutta Connect in order to contact the contributor
Submitted on : Friday, May 17, 2019 - 12:29:00 PM
Last modification on : Monday, October 11, 2021 - 1:24:13 PM
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