Document Detail

Validity of oxygen uptake measurements during exercise under moderate hyperoxia.
MedLine Citation:
PMID:  9624658     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The validity of oxygen uptake in hyperoxia (FIO2 = 30%) measured by an automated system (MedGraphics, CPX/D system) was assessed during the simulation of gas exchanges during exercise with a mechanical system and during submaximal exercise by human subjects. METHODS: The simulation system reproduced a stable and accurate VO2 for 30 min (sim-test). This trial was repeated nine times in normoxia and nine times in hyperoxia. Ten subjects also performed two submaximal exercises (55% of normoxic VO2max) on a cycle ergometer at the same absolute power in normoxia and in hyperoxia (ex-test). RESULTS: There was a significant downward drift of the oxygen fraction measurement in hyperoxia (< or = 0.10% for FIO2 and FEO2) during sim-test, but VO2 measurement remained stable in the two conditions. There was also a downward drift of the oxygen fraction measurement in the two conditions (< or = 0.07% for FIO2) during ex-test. VO2 was significantly higher in hyperoxia (+4.6%), and this result was confirmed using a modified Douglas bag method. CONCLUSIONS: These findings show that the CPX/D system is stable and valid for assessing VO2 in moderate hyperoxia.
F Prieur; T Busso; J Castells; R Bonnefoy; H Benoit; A Geyssant; C Denis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  30     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  1998 Jun 
Date Detail:
Created Date:  1998-08-14     Completed Date:  1998-08-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  958-62     Citation Subset:  IM; S    
Laboratoire de Physiologie-GIP Exercise, Université Jean Monnet, Faculté de Médecine Saint-Etienne, France.
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MeSH Terms
Exercise / physiology*
Models, Biological
Oxygen Consumption*
Reproducibility of Results

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

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