Document Detail


Slow upward drift of VO2 during constant-load cycling in untrained subjects.
MedLine Citation:
PMID:  3203667     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The oxygen uptake kinetics during constant-load exercise when sitting on a bicycle ergometer were determined in 7 untrained subjects by measuring breath-by-breath VO2 during continuous exercise to volitional exhaustion (mean endurance time = 1160 +/- 172 s) at a pedal frequency of 70 revolutions.min-1. The power output, averaging 189.5 W, was set at 82.5% of that eliciting the individual VO2max during a 5 min incremental exercise test. Throughout the exercise period, the VO2 kinetics could be appropriately described by a two-component exponential equation of the form: VO2(t) = Ya[1 - exp(-kat)] + Yb[1 - exp(-kbt)] where VO2 is net oxygen consumption and t the time from work onset. VO2 measured at the end of exercise was close to VO2max (98% VO2max) and the mean values of Ya, ka, Yb and kb amounted to 1195 ml O2.min-1, 0.034 s-1, 1562 ml O2.min-1, and 0.005 s-1 respectively. The initial rate of increase in VO2 predicted from the above equation is slower than that calculated, for the same work intensity, on the basis of the data obtained by Morton (1985) in trained subjects. For t greater than 480 s, however, the two models yield substantially equal results.
Authors:
G Camus; G Atchou; J C Bruckner; D Giezendanner; P E di Prampero
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  58     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1988  
Date Detail:
Created Date:  1989-01-31     Completed Date:  1989-01-31     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  197-202     Citation Subset:  IM    
Affiliation:
FNRS--Belgium, Laboratory of Human Applied Physiology, Liege.
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MeSH Terms
Descriptor/Qualifier:
Bicycling*
Humans
Kinetics
Models, Biological
Oxygen Consumption*
Physical Education and Training
Sports*
Time Factors

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


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