| Intramuscular metabolism during low-intensity resistance exercise with blood flow restriction. | |
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MedLine Citation:
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PMID: 19213931 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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 (31)P-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 (H(2)PO(4)(-)) levels and intramuscular pH at rest and during exercise were obtained. We found that the PCr depletion, the H(2)PO(4)(-) 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. |
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Authors:
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Tadashi Suga; Koichi Okita; Noriteru Morita; Takashi Yokota; Kagami Hirabayashi; Masahiro Horiuchi; Shingo Takada; Tomohiro Takahashi; Masashi Omokawa; Shintaro Kinugawa; Hiroyuki Tsutsui |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-02-12 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 106 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2009 Apr |
Date Detail:
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Created Date: 2009-04-01 Completed Date: 2009-05-29 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 1119-24 Citation Subset: IM |
Affiliation:
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Graduate School of Program in Lifelong Learning Studies, Hokusho University, Ebetsu, Hokkaido, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Female Humans Hydrogen-Ion Concentration Hypertrophy Magnetic Resonance Spectroscopy Male Muscle Fibers, Fast-Twitch / physiology Muscle Fibers, Skeletal / physiology Muscle, Skeletal / blood supply*, metabolism*, physiology Organ Size / physiology Phosphates / metabolism Phosphocreatine / metabolism Physical Fitness / physiology* Regional Blood Flow / physiology Sex Characteristics Weight Lifting / physiology* Young Adult |
| Chemical | |
Reg. No./Substance:
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0/Phosphates; 67-07-2/Phosphocreatine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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