The Effect of the Branched-Chain Amino Acid Intake on Muscle Fatigue During Exercise

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  • 分枝アミノ酸摂取の有無が運動負荷中の筋疲労に及ぼす影響
  • ブンシ アミノサン セッシュ ノ ウム ガ ウンドウ フカ チュウ ノ キン ヒロウ ニ オヨボス エイキョウ

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Abstract

<p>Background: This study used surface electromyography (EMG) to examine the effect of the presence or absence of the branched-chain amino acid (BCAA) intake on muscle fatigue during continuous exercise.</p><p>Subjects and Methods: Ten healthy adult subjects underwent a 120-second 50％ MVC isometric knee extension exercise twice, with and without BCAA. The rectus femoris (RF), vastus lateralis (VL), and vastus medialis (VM) muscles and integrated electromyogram (iEMG) and mean power frequency (MPF) obtained by EMG from the start of the measurement to 95 seconds later were analyzed and calculated, respectively.</p><p>Results: The iEMG showed no significant difference in each muscle activity during exercise load between the two groups. In MPF at the start of the measurement, VM was significantly lower than RF and VL. Comparing MPF with and without BCAA intake, RF and VL were significantly different at the start-5 seconds and 30-35 seconds and 60-65 seconds after the start of the measurement. No significant difference was found in all VMs.</p><p>Conclusions: From this result, BCAA intake clearly has an effect of suppressing muscle fatigue at the start of measurement in the case of the muscles having a large proportion of Type II fibers.</p>

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