随意運動由来の筋疲労に誘発された皮質脊髄路および運動皮質内回路の興奮性変化

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The effects of fatiguing muscle contraction on corticospinal and cortical projection, assessed by using transcranial magnetic stimulation (TMS), has been reported in several studies. Most of these studies have examined changes in excitability in the central nervous system innervating exercised muscle, and have been reported that muscle fatigue in a small muscle group leads to a transient change in the excitability of cortical projections from the contralateral hemisphere to the fatigued muscle. In contrast, from the fact that muscle fatigue in a large muscle group induced prolongation of the changes in the excitability as compared with a small muscle group, it seems likely that different responses between small and large muscle groups may be derived from differing muscle mass level and/or motor unit number count recruited by exercise and that the effects are localized in the "exercised" region of the cortex. Furthermore, very few reports explain how exercise of one muscle group influences excitability in projections to non-exercised muscles. Although many studies have provided evidences that exercise-induced muscle fatigue affects excitability in the central nervous system innervating exercised muscle, few studies have been reported on the region innervating non-exercised muscle. For clarification of the comprehensive relationship between exercise and changes in central nervous system excitability, further studies that analyze the changes in central nervous system excitability that occur not only in exercised muscle but also in non-exercised muscle are required. In this review paper, we have outlined the results of studies that investigated the effects of muscle fatigue assessed by motor evoked potential using TMS and focused on the changes in central nervous system excitability in non-exercised muscle due to voluntary fatiguing exercise.
2012-01-31

随意運動由来の筋疲労に誘発された皮質脊髄路および運動皮質内回路の興奮性変化

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