Document Detail

Respiratory muscle perfusion and energetics during exercise.
MedLine Citation:
PMID:  8882999     Owner:  NLM     Status:  MEDLINE    
The oxygen cost of breathing and blood flow requirements of the respiratory muscles during exercise are discussed along with the implications for limitation of locomotor muscle and exercise performance. Findings show that the oxygen cost of the hyperpnea achieved during very heavy exercise may approach 15% or more of VO2max under conditions that require extraordinary levels of ventilatory work. These conditions include those in the highly trained endurance athlete (at VE > 150 l.min-1), the older athlete at VE of 110-120 l.min-1), and athletic cursorial mammals at VO2max--all of whom experience significant expiratory flow limitation and sometimes even complete ventilatory limitation during heavy or maximum exercise. Rates of blood flow to the respiratory muscles under these peak exercise conditions may equal or exceed those to the limb locomotor muscles. The hypothesis is advanced that excessive requirements of ventilatory work (and therefore VO2 and blood flow) during heavy exercise may cause reflex vasoconstriction of locomotor muscles resulting in curtailment of endurance exercise performance.
J A Dempsey; C A Harms; D M Ainsworth
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.; Review    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  28     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  1996 Sep 
Date Detail:
Created Date:  1997-01-23     Completed Date:  1997-01-23     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:  1123-8     Citation Subset:  IM; S    
John Rankin Laboratory of Pulmonary Medicine, Department of Preventive Medicine, University of Wisconsin-Madison 53705, USA.
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MeSH Terms
Energy Metabolism*
Exercise / physiology*
Muscle, Skeletal / physiology
Oxygen Consumption
Physical Endurance / physiology
Regional Blood Flow
Respiratory Mechanics / physiology*
Respiratory Muscles / blood supply,  metabolism*
Vasoconstriction / physiology
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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