Anodal-tDCS applied during unilateral strength training increases strength and corticospinal excitability in the untrained homologous muscle

Hendy, Ashlee M. and Kidgell, Dawson J. 2014, Anodal-tDCS applied during unilateral strength training increases strength and corticospinal excitability in the untrained homologous muscle, Experimental brain research, vol. 232, no. 10, pp. 3243-3252, doi: 10.1007/s00221-014-4016-8.

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Title Anodal-tDCS applied during unilateral strength training increases strength and corticospinal excitability in the untrained homologous muscle
Author(s) Hendy, Ashlee M.ORCID iD for Hendy, Ashlee M. orcid.org/0000-0002-9043-8385
Kidgell, Dawson J.
Journal name Experimental brain research
Volume number 232
Issue number 10
Start page 3243
End page 3252
Total pages 10
Publisher Springer
Place of publication Heidelberg, Germany
Publication date 2014-10
ISSN 0014-4819
1432-1106
Keyword(s) corticospinal excitability
cross-activation
cross-transfer
strength
tDCS
Summary Evidence suggests that the cross-transfer of strength following unilateral training may be modulated by increased corticospinal excitability of the ipsilateral primary motor cortex, due to cross-activation. Anodal-tDCS (a-tDCS) has been shown to acutely increase corticospinal excitability and motor performance, which may enhance this process. Therefore, we sought to examine changes in neural activation and strength of the untrained limb following the application of a-tDCS during a single unilateral strength training session. Ten participants underwent three conditions in a randomized, double-blinded crossover design: (1) strength training + a-tDCS, (2) strength training + sham-tDCS and (3) a-tDCS alone. a-tDCS was applied for 20 min at 2 mA over the right motor cortex. Unilateral strength training of the right wrist involved 4 × 6 wrist extensions at 70 % of maximum. Outcome measures included maximal voluntary strength, corticospinal excitability, short-interval intracortical inhibition, and cross-activation. We observed a significant increase in strength of the untrained wrist (5.27 %), a decrease in short-interval intracortical inhibition (−13.49 %), and an increase in cross-activation (15.71 %) when strength training was performed with a-tDCS, but not following strength training with sham-tDCS, or tDCS alone. Corticospinal excitability of the untrained wrist increased significantly following both strength training with a-tDCS (17.29 %), and a-tDCS alone (15.15 %), but not following strength training with sham-tDCS. These findings suggest that a single session of a-tDCS combined with unilateral strength training of the right limb increases maximal strength and cross-activation to the contralateral untrained limb.
Language eng
DOI 10.1007/s00221-014-4016-8
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
110903 Central Nervous System
Socio Economic Objective 920412 Preventive Medicine
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2014, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30065175

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Created: Mon, 28 Jul 2014, 15:55:40 EST by Penny Andrews

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