Change of M-wave accompanied with fatigue on human muscle

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  • 疲労による誘発筋電図(M波)の変化
  • ヒロウ ニ ヨル ユウハツキンデンズ Mハ ノ ヘンカ

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The mechanism behind the process of muscular fatigue in maximum voluntary contractions was studied. Maximum strength in thumb adduction was recorded by use of a resistance strain gauge transducer, and action potential was recorded using 10mm diameter silver disk electrode. The following results were obtained : 1. The amplitude of action potential evoked by ulnar nerve stimulation (M.wave) during rhythmic voluntary contractions was reduced. During recovery process after fatigue, the size of evoked action potential was returned to resting level before exercise. 2. The reduction in the size of evoked action potential was found to have been obtained by sustained voluntary contractions. 3. These findings differ from those based on the work of Merton (1954) who stated that evoked action patentials were not reduced during sustained voluntary contractions. 4. The current results, mentioned above, support the views of Naess and Storm-Mathisen (1955) and Stephens and Taylor (1972) that the reduction in evoked action potentials indicated the neuromuscular junction failure (neuromuscular block).

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