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Dose effect on intramuscular metabolic stress during low-intensity resistance exercise with blood flow restriction

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Title: Dose effect on intramuscular metabolic stress during low-intensity resistance exercise with blood flow restriction
Authors: Suga, Tadashi Browse this author
Okita, Koichi Browse this author →KAKEN DB
Morita, Noriteru Browse this author →KAKEN DB
Yokota, Takashi Browse this author →KAKEN DB
Hirabayashi, Kagami Browse this author
Horiuchi, Masahiro Browse this author
Takada, Shingo Browse this author →KAKEN DB
Omokawa, Masashi Browse this author
Kinugawa, Shintaro Browse this author →KAKEN DB
Tsutsui, Hiroyuki Browse this author →KAKEN DB
Keywords: optimization
resistance training
energetic metabolism
magnetic resonance spectroscopy
Issue Date: 2010
Publisher: American Physiological Society
Journal Title: Journal of Applied Physiology
Volume: 108
Issue: 6
Start Page: 1563
End Page: 1567
Publisher DOI: 10.1152/japplphysiol.00504.2009
Abstract: Our previous study reported that metabolic stress in skeletal muscle achieved by combining moderate blood flow restriction (BFR) with low-intensity resistance exercise at 20% of one repetition maximum (1 RM) could not reach the level achieved by high-intensity resistance exercise. Since the previous protocol is typical of current regimens of this type, we sought in this study to optimize the exercise protocol for low-intensity resistance exercise with BFR by examining the dose effects of exercise intensity and pressure. Twelve healthy subjects participated in this study. They were asked to perform unilateral plantar flexion for 2 min (30 repetitions/min) under six different conditions: two resistance exercises (20% 1 RM and 65% 1 RM) without BFR, and four BFR protocols. The four BFR protocols included three different exercise intensities (20, 30, and 40% 1 RM) with moderate pressure (MP) using 130% of systolic blood pressure (147 ± 17 mmHg, mean ± SD) and 20% 1 RM with high pressure at 200 mmHg. Intramuscular metabolites and pH were obtained by 31P-magnetic resonance spectroscopy. Significant dose effects on intramuscular metabolites and pH were observed for exercise intensity (P < 0.001) but not for BFR pressure. The BFR protocol combining 30% 1 RM with MP had similar results as the high-intensity load at 65% 1 RM. Intramuscular metabolic stress during BFR exercise might be susceptible to increasing exercise intensity. To replace high-intensity resistance exercise, the BFR protocol might require an intensity of ≥30% 1 RM.
Type: article
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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