| Blood flow and muscle oxygen uptake at the onset and end of moderate and heavy dynamic forearm exercise. | |
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MedLine Citation:
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PMID: 11353679 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We hypothesized that forearm blood flow (FBF) during moderate intensity dynamic exercise would meet the demands of the exercise and that postexercise FBF would quickly recover. In contrast, during heavy exercise, FBF would be inadequate causing a marked postexercise hyperemia and sustained increase in muscle oxygen uptake (VO(2musc)). Six subjects did forearm exercise (1-s contraction/relaxation, 1-s pause) for 5 min at 25 and 75% of peak workload. FBF was determined by Doppler ultrasound, and O(2) extraction was estimated from venous blood samples. In moderate exercise, FBF and VO(2musc) increased within 2 min to steady state. Rapid recovery to baseline suggested adequate O(2) supply during moderate exercise. In contrast, FBF was not adequate during heavy dynamic exercise. Immediately postexercise, there was an approximately 50% increase in FBF. Furthermore, we observed for the first time in the recovery period an increase in VO(2musc) above end-exercise values. During moderate exercise, O(2) supply met requirements, but with heavy forearm exercise, inadequate O(2) supply during exercise caused accumulation of a large O(2) deficit that was repaid during recovery. |
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Authors:
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M C Van Beekvelt; J K Shoemaker; M E Tschakovsky; M T Hopman; R L Hughson |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: American journal of physiology. Regulatory, integrative and comparative physiology Volume: 280 ISSN: 0363-6119 ISO Abbreviation: Am. J. Physiol. Regul. Integr. Comp. Physiol. Publication Date: 2001 Jun |
Date Detail:
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Created Date: 2001-05-16 Completed Date: 2001-07-05 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 100901230 Medline TA: Am J Physiol Regul Integr Comp Physiol Country: United States |
Other Details:
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Languages: eng Pagination: R1741-7 Citation Subset: IM |
Affiliation:
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Department of Kinesiology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Arteries Blood Pressure / physiology Brachial Artery / physiology Exercise / physiology* Female Forearm / blood supply*, physiology* Humans Lactic Acid / blood Male Muscle, Skeletal / metabolism* Osmolar Concentration Oxygen / blood Oxygen Consumption* Vasodilation Veins |
| Chemical | |
Reg. No./Substance:
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50-21-5/Lactic Acid; 7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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