The effects of inspiratory muscle fatigue on subsequent high-intensity exercise performance and muscle tissue oxygenation

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  • Koizumi Jun
    Graduate School of Sport Science, Chukyo University
  • Izumi Kazuma
    Graduate School of Education and Human Development, Nagoya University
  • Ohya Toshiyuki
    Graduate School of Sport Science, Chukyo University School of Health and Sport Science, Chukyo University

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  • 吸息筋疲労がその後の高強度運動パフォーマンおよび筋組織酸素動態に及ぼす影響
  • 吸息筋疲労がその後の高強度運動パフォーマンスおよび筋組織酸素動態に及ぼす影響
  • キュウソクキン ヒロウ ガ ソノゴ ノ コウキョウド ウンドウ パフォーマンス オヨビ キン ソシキ サンソ ドウタイ ニ オヨボス エイキョウ

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<p>It has been suggested that inspiratory muscles fatigue impairing blood flow to the active limb muscle via respiratory muscle metaboreflex. The purpose of this study was to investigate the effects of inspiratory muscle fatigue on exercise performance and muscle tissue oxygenation in high-intensity exercise takes about 3.5~5min. Eleven healthy males subjects performed two conditions of constant-load exercise to exhaustion (TTE) on a cycle ergometer at 100% of maximal oxygen uptake. The two conditions—inspiratory muscle fatiguing (IMF) and non-fatiguing (PLA) —which had different intensity inspiratory resistance breathing (IRB) were performed before exercise. Muscle tissue oxygenations were measured by deoxyhemogrobin (HHb), oxygen saturation index (StO2) from right vastus lateralis during TTE. All data were analyzed from nine subjects whose inspiratory muscle were fatigued by IRB in IMF. Results: TTE was significantly shorter in IMF compare to PLA (244±31s vs. 268±38s, p<0.05). HHb was significantly higher and StO2 was significantly lower in IMF than in PLA (p<0.05). Conclusion: High-intensity exercise completed in 3.5~5 minutes, it was suggested that inspiratory muscle fatigue reduced the oxygen deriver to active limb muscle, resulting in decrease exercise performance. Improving function of inspiratory muscles, such as in inspiratory muscle training, may improve oxygenation of the active limb muscle and enhance exercise performance.</p>

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