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Anodal Transcranial Direct Current Stimulation over the Vertex Enhances Leg Motor Cortex Excitability Bilaterally

1
Centre for Neuromuscular and Neurological Disorders, Perron Institute for Neurological and Translational Science, University of Western Australia, QEII Medical Centre, Nedlands, WA 6009, Australia
2
Department of Physiotherapy, Sir Charles Gairdner Hospital, Hospital Avenue, Nedlands, WA 6009, Australia
*
Author to whom correspondence should be addressed.
Brain Sci. 2019, 9(5), 98; https://doi.org/10.3390/brainsci9050098
Received: 4 March 2019 / Revised: 19 April 2019 / Accepted: 26 April 2019 / Published: 29 April 2019
(This article belongs to the Collection Collection on Clinical Neuroscience)
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Abstract

In many studies, anodal transcranial Direct Current Stimulation (tDCS) is applied near the vertex to simultaneously facilitate leg motor cortex (M1) of both hemispheres and enhance recovery of gait and balance in neurological disorders. However, its effect on the excitability of leg M1 in either hemisphere is not well known. In this double-blind sham-controlled study, corticospinal excitability changes induced in leg M1 of both hemispheres by anodal (2 mA for 20 minutes) or sham tDCS (for 20 min) over the vertex were evaluated. Peak amplitudes of Transcranial Magnetic Stimulation (TMS) induced motor evoked potentials (MEPs) were measured over the contralateral Tibialis Anterior (TA) muscle before and up to 40 min after tDCS in 11 normal participants. Analysis of data from all participants found significant overall increase in the excitability of leg M1 after tDCS. However, in individual subjects there was variability in observed effects. In 4 participants, 20 min of tDCS increased mean MEPs of TAs on both sides; in 4 participants there was increased mean MEP only on one side and in 3 subjects there was no change. It’s not known if the benefits of tDCS in improving gait and balance are dependent on excitability changes induced in one or both leg M1; such information may be useful to predict treatment outcomes. View Full-Text
Keywords: transcranial direct current stimulation; leg motor cortex; corticospinal excitability transcranial direct current stimulation; leg motor cortex; corticospinal excitability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ghosh, S.; Hathorn, D.; Eisenhauer, J.; Dixon, J.; Cooper, I.D. Anodal Transcranial Direct Current Stimulation over the Vertex Enhances Leg Motor Cortex Excitability Bilaterally. Brain Sci. 2019, 9, 98.

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