Document Detail


Muscle oxygenation during incremental arm and leg exercise in men and women.
MedLine Citation:
PMID:  9809843     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to compare the rates of muscle deoxygenation in the exercising muscles during incremental arm cranking and leg cycling exercise in healthy men and women. Fifteen men and 10 women completed arm cranking and leg cycling tests to exhaustion in separate sessions in a counterbalanced order. Cardiorespiratory measurements were monitored using an automated metabolic cart interfaced with an electrocardiogram. Tissue absorbency was recorded continuously at 760 nm and 850 nm during incremental exercise and 6 min of recovery, with a near infrared spectrometer interfaced with a computer. Muscle oxygenation was calculated from the tissue absorbency measurements at 30%, 45%, 60%, 75% and 90% of peak oxygen uptake (VO2) during each exercise mode and is expressed as a percentage of the maximal range observed during exercise and recovery (%Mox). Exponential regression analysis indicated significant inverse relationships (P < 0.01) between %Mox and absolute VO2 during arm cranking and leg cycling in men (multiple R = -0.96 and -0.99, respectively) and women (R = -0.94 and -0.99, respectively). No significant interaction was observed for the %Mox between the two exercise modes and between the two genders. The rate of muscle deoxygenation per litre of VO2 was 31.1% and 26.4% during arm cranking and leg cycling, respectively, in men, and 26.3% and 37.4% respectively, in women. It was concluded that the rate of decline in %Mox for a given increase in VO2 between 30% and 90% of the peak VO2 was independent of exercise mode and gender.
Authors:
Y Bhambhani; R Maikala; S Buckley
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  78     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1998 Oct 
Date Detail:
Created Date:  1999-01-05     Completed Date:  1999-01-05     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  422-31     Citation Subset:  IM; S    
Affiliation:
Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Canada.
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology
Adult
Arm / physiology
Female
Humans
Lactic Acid / metabolism
Leg / physiology
Male
Muscle, Skeletal / physiology*
Oxygen Consumption / physiology*
Physical Exertion / physiology*
Sex Characteristics*
Spectroscopy, Near-Infrared
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid

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


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