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Kotan S, Kojima S, Miyaguchi S, et al. Depression of corticomotor excitability after muscle fatigue induced by electrical stimulation and voluntary contraction. Front Hum Neurosci. 2015;9:363doi: 10.3389/fnhum.2015.00363.
Kotan, S., Kojima, S., Miyaguchi, S., Sugawara, K., & Onishi, H. (2015). Depression of corticomotor excitability after muscle fatigue induced by electrical stimulation and voluntary contraction. Frontiers in human neuroscience, 9363. https://doi.org/10.3389/fnhum.2015.00363
Kotan, Shinichi, et al. "Depression of corticomotor excitability after muscle fatigue induced by electrical stimulation and voluntary contraction." Frontiers in human neuroscience vol. 9 (2015): 363. doi: https://doi.org/10.3389/fnhum.2015.00363
Kotan S, Kojima S, Miyaguchi S, Sugawara K, Onishi H. Depression of corticomotor excitability after muscle fatigue induced by electrical stimulation and voluntary contraction. Front Hum Neurosci. 2015 Jun 19;9:363. doi: 10.3389/fnhum.2015.00363. eCollection 2015. PMID: 26150781; PMCID: PMC4472998.
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Front Hum Neurosci. 2015 Jun 19;9:363. doi: 10.3389/fnhum.2015.00363. eCollection 2015.

Depression of corticomotor excitability after muscle fatigue induced by electrical stimulation and voluntary contraction.

Frontiers in human neuroscience

Shinichi Kotan, Sho Kojima, Shota Miyaguchi, Kazuhiro Sugawara, Hideaki Onishi

Affiliations

  1. Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare Niigata, Japan.

PMID: 26150781 PMCID: PMC4472998 DOI: 10.3389/fnhum.2015.00363

Abstract

In this study, we examined the effect of muscle fatigue induced by tetanic electrical stimulation (ES) and submaximal isometric contraction on corticomotor excitability. Experiments were performed in a cross-over design. Motor-evoked potentials (MEPs) were elicited by transcranial magnetic stimulation (TMS). Corticomotor excitability was recorded before and after thumb opposition muscle fatigue tasks, in which 10% of the maximal tension intensity was induced by tetanic ES or voluntary contraction (VC). The participants were 10 healthy individuals who performed each task for 10 min. Surface electrodes placed over the abductor pollicis brevis (APB) muscle recorded MEPs. F- and M-waves were elicited from APB by supramaximal ES of the median nerve. After the tetanic ES- and VC tasks, MEP amplitudes were significantly lower than before the task. However, F- and M-wave amplitudes remained unchanged. These findings suggest that corticospinal excitability is reduced by muscle fatigue as a result of intracortical inhibitory mechanisms. Our results also suggest that corticomotor excitability is reduced by muscle fatigue caused by both VC and tetanic ES.

Keywords: F-wave; M-wave; fatigue; motor-evoked potential; tetanic electrical stimulation; transcranial magnetic stimulation

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