Document Detail

Effect of skeletal muscle demand on cardiovascular function.
MedLine Citation:
PMID:  10647535     Owner:  NLM     Status:  MEDLINE    
Cardiac output is directed primarily to skeletal muscle during exercise. Recent investigations have examined how different groups of skeletal muscle compete for the cardiac output during exercise. To date, there is a lack of consistent findings on a blood flow steal effect of arm versus leg exercise, although the majority of data suggest that leg blood flow is not compromised when arm exercise is added to leg exercise. A recent set of experiments have demonstrated that respiratory muscles compete favorably for blood flow with the legs during maximal exercise. Decreased work of breathing leads to: 1) a decrease in cardiac output, due primarily to reduced stroke volume; and 2) increased leg blood flow and leg vascular conductance. An increased work of breathing leads to the converse. Exercise performance may also be affected by the work of breathing during heavy exercise due to redistribution of blood flow between the chest wall and the locomotor muscles. It appears that in contrast to arm exercise, respiratory muscles demand a significant portion of the cardiac output during maximal exercise, and the work of breathing normally experienced during heavy exercise compromises leg blood flow.
C A Harms
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.; Review    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  32     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2000 Jan 
Date Detail:
Created Date:  2000-02-10     Completed Date:  2000-02-10     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  94-9     Citation Subset:  IM; S    
Department of Kinesiology, Kansas State University, Manhattan 66506, USA.
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MeSH Terms
Arm / blood supply
Cardiac Output / physiology*
Exercise / physiology
Leg / blood supply
Muscle, Skeletal / blood supply,  metabolism*
Oxygen Consumption / physiology*
Regional Blood Flow / physiology
Respiratory Muscles / blood supply
Work of Breathing / physiology
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