Temporal Facilitation Prior to Voluntary Muscle Relaxation

Authors: Sugawara, Kenichi¹; Tanabe, Shigeo²; Higashi, Toshio¹; Tsurumi, Takamasa¹; Kasai, Tatsuya³

Source: International Journal of Neuroscience, Volume 119, Number 3, March 2009 , pp. 442-452(11)

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Abstract:

We investigated the dominancy of excitability changes in motor cortex or spinal levels and temporal tuning mechanisms of muscle relaxation. We delivered transcranial magnetic stimulation and electric (H-reflex) stimulations relative to the application of the response signal under the reaction time task. The results showed that a significant change was found in only motor evoked potential during the prerelaxation phase, 30 ms after the response signal presented for muscle relaxation, but similar changes were not found in H-reflex. We suggested that this phenomenon, may be, reflects on excitation of corticospinal neurons, which consequently play an important role for muscle relaxation.

Keywords: H-reflex; motor evoked potential (MEP); muscle relaxation; reaction time task; temporal tuning; transcranial magnetic stimulation (TMS)

Document Type: Research article

DOI: http://dx.doi.org/10.1080/00207450802480077

Affiliations: 1: School of Rehabilitation, Faculty of Health and Social Work, Kanagawa University of Human Services, Yokosuka, Kanagawa, Japan 2: Keio University Tsukigase Rehabilitation Center, Izu-city, Shizuoka, Japan 3: Division of Sports & Health Sciences Graduate School for International Development and Cooperation, Hiroshima University, Higashihiroshima, Hiroshima, Japan

Publication date: 2009-03-01

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