| Venous blood gas and metabolite response to low-intensity muscle contractions with external limb compression. | |
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MedLine Citation:
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PMID: 20199783 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effect of low-intensity resistance exercise with external limb compression (100 [EC100] and 160 [EC160] mm Hg) on limb blood flow and venous blood gas-metabolite response was investigated and compared with that of high-intensity resistance exercise (no external compression). Unilateral elbow flexion muscle contractions were performed at 20% (75 repetitions, 4 sets, 30-second rest intervals) and 70% of 1-repetition maximum (1-RM; 3 sets, each set was until failure, 3-minute rest intervals). Precontraction brachial arterial blood flow (Doppler ultrasound) was reduced with EC100 or EC160 (56% and 39% of baseline value, respectively) compared with no external compression (control). At 20% 1-RM, brachial arterial blood flow increased after contractions performed with EC160 (190%), but not with the others. Decreases in venous oxygen partial pressure (P(v)O(2)) and venous oxygen saturation (S(v)O(2)) were greater during EC100 and EC160 than control (mean [SE]: P(v)O(2), 28 [3] vs 26 [2] vs 33 [2] mm Hg; S(v)O(2), 41% [5%] vs 34% [4%] vs 52% [5%], respectively). Changes in venous pH (pH(v)), venous carbon dioxide partial pressure (P(v)CO(2)), and venous lactate concentration ([L(-)](v)) were greater with EC160 than EC100 and/or control (pH(v), 7.19 [0.01] vs 7.25 [0.01] vs 7.27 [0.02]; P(v)CO(2), 72 [3] vs 64 [2] vs 60 [3] mm Hg; [L(-)](v), 5.4 [0.6] vs 3.7 [0.4] vs 3.0 [0.4] mmol/L, respectively). Seventy percent 1-RM contractions resulted in greater changes in pH(v) (7.14 [0.02]), P(v)CO(2) (91 [5] mm Hg), and [L(-)](v) (7.0 [0.5] mmol/L) than EC100 and EC160, but P(v)O(2) (30 [4] mm Hg) and S(v)O(2) (40% [3%]) were similar. In conclusion, changes in pH(v), P(v)CO(2), and [L(-)](v), but not in P(v)O(2) and S(v)O(2), are sensitive to changes in relative, "internal" intensity of low-intensity muscle contractions caused by reduced blood flow (EC160) or high-intensity muscle contractions. Given the magnitude of the changes in pH(v), P(v)CO(2), and [L(-)](v), it appears plausible that they may be involved in stimulating the observed increase in muscle activation via group III and IV afferents. |
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Authors:
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Tomohiro Yasuda; Takashi Abe; William F Brechue; Haruko Iida; Haruhito Takano; Kentaro Meguro; Miwa Kurano; Satoshi Fujita; Toshiaki Nakajima |
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Publication Detail:
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Type: Journal Article; Randomized Controlled Trial Date: 2010-03-04 |
Journal Detail:
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Title: Metabolism: clinical and experimental Volume: 59 ISSN: 1532-8600 ISO Abbreviation: Metab. Clin. Exp. Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-09-21 Completed Date: 2010-10-27 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375267 Medline TA: Metabolism Country: United States |
Other Details:
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Languages: eng Pagination: 1510-9 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Ischemic Circulatory Physiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan. yasuda@h.k.u-tokyo.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Blood Gas Analysis Brachial Artery / chemistry, pathology Constriction, Pathologic / blood Extremities / blood supply*, pathology*, physiology Gases / analysis, blood*, metabolism* Humans Male Metabolome / physiology Muscle Contraction / physiology* Physical Exertion / physiology Pressure Regional Blood Flow / physiology Resistance Training* Veins / chemistry, physiology Young Adult |
| Chemical | |
Reg. No./Substance:
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0/Gases |
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