<Revierws>Effects of Blood Flow Restriction on Intramuscular Energetic Metabolism During Resistance Exercise
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概要
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Skeletal muscle bulk and strength are becoming important therapeutic targets in exercise therapy. However, in standard resistance training intensive loads are placed on muscles, which is difficult for weak subjects. Recently, studies have reported that low-intensity resistance training with blood flow restriction (BFR) increased muscle bulk and strength as effectively as high-intensity resistance training despite the lower mechanical load, although the exact mechanism and its generality have not yet been clarified. We investigated the intramuscular metabolism during low-intensity resistance exercise with BFR and compared it with that of high-intensity and low-intensity resistance exercises without BFR by using ^<31>P-magnetic resonance spectroscopy. We found that metabolic stress in skeletal muscle estimated as the phosphocreatine depletion and intramuscular pH decrease during low-intensity resistance exercise with BFR was significantly greater than that in low-intensity resistance exercise without BFR, but significantly lower than that in high-intensity without BFR. The recruitment of fast-twitch fiber evaluated by inorganic phosphate splitting occurred less in low-intensity resistance exercise with BFR compared to high-intensity without BFR. In conclusion, the metabolic stress in skeletal muscle during low-intensity resistance exercise was significantly increased by applying BFR, but did not generally reach the level of that during high-intensity resistance exercise. This new method of resistance training needs to be examined for optimization of the protocol to reach equivalence with high-intensity resistance training.
- 日本運動生理学会の論文
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