Intramuscular metabolism during low-intensity resistance exercise with blood flow restriction

Suga, Tadashi; Okita, Koichi; Morita, Noriteru; Yokota, Takashi; Hirabayashi, Kagami; Horiuchi, Masahiro; Takada, Shingo; Takahashi, Tomohiro; Omokawa, Masashi; Kinugawa, Shintaro; Tsutsui, Hiroyuki

Intramuscular metabolism during low-intensity resistance exercise with blood flow restriction

Suga, Tadashi; Okita, Koichi; Morita, Noriteru et al.

Journal of Applied Physiology, 2009, 106(4), 1119-1124

Permalink : https://hdl.handle.net/2115/76760

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https://doi.org/10.1152/japplphysiol.90368.2008			20

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アクセス権	open access
URI	https://hdl.handle.net/2115/76760
タイトル	Intramuscular metabolism during low-intensity resistance exercise with blood flow restriction
著者	Suga, Tadashi ; Okita, Koichi ; Morita, Noriteru ; Yokota, Takashi ; Hirabayashi, Kagami ; Horiuchi, Masahiro ; Takada, Shingo ; Takahashi, Tomohiro ; Omokawa, Masashi ; Kinugawa, Shintaro ; Tsutsui, Hiroyuki
著者名 Suga, Tadashi
著者名 Okita, Koichi
e-Rad_Researcher 10382540 著者名 Morita, Noriteru
e-Rad_Researcher 90374321 著者名 Yokota, Takashi
著者名 Hirabayashi, Kagami
著者名 Horiuchi, Masahiro
e-Rad_Researcher 60722329 著者名 Takada, Shingo
著者名 Takahashi, Tomohiro
著者名 Omokawa, Masashi
e-Rad_Researcher 60399871 著者名 Kinugawa, Shintaro
e-Rad_Researcher 70264017 著者名 Tsutsui, Hiroyuki
言語	英語
キーワード	training
	sex
	strength
	hypertrophy
	magnetic resonance spectroscopy
発行日	2009
出版者	American Physiological Society
収録物名	Journal of Applied Physiology
巻(号)	106(4)
ページ	1119-1124
抄録	Although recent studies have reported that low-intensity resistance training with blood flow restriction could stress the muscle effectively and provide rapid muscle hypertrophy and strength gain equivalent to those of high-intensity resistance training, the exact mechanism and its generality have not yet been clarified. We investigated the intramuscular metabolism during low-intensity resistance exercise with blood flow restriction and compared it with that of high-intensity and low-intensity resistance exercises without blood flow restriction using 31P-magnetic resonance spectroscopy. Twenty-six healthy subjects (22 ± 4 yr) participated and performed unilateral plantar flexion (30 repetitions/min) for 2 min. Protocols were as follows: low-intensity exercise (L) using a load of 20% of one-repetition maximum (1 RM), L with blood flow restriction (LR), and high-intensity exercise using 65% 1 RM (H). Intramuscular phosphocreatine (PCr) and diprotonated phosphate (H2PO4−) levels and intramuscular pH at rest and during exercise were obtained. We found that the PCr depletion, the H2PO4− increase, and the intramuscular pH decrease during LR were significantly greater than those in L (P < 0.001); however, those in LR were significantly lower than those in H (P < 0.001). The recruitment of fast-twitch fiber evaluated by inorganic phosphate splitting occurred in only 31% of the subjects in LR, compared with 70% in H. In conclusion, the metabolic stress in skeletal muscle during low-intensity resistance exercise was significantly increased by applying blood flow restriction, but did not generally reach 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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
PISSN	8750-7587
EISSN	1522-1601
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1152/japplphysiol.90368.2008