| Slow upward drift of VO2 during constant-load cycling in untrained subjects. | |
MedLine Citation:
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PMID: 3203667 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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:
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G Camus; G Atchou; J C Bruckner; D Giezendanner; P E di Prampero |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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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:
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Created Date: 1989-01-31 Completed Date: 1989-01-31 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 0410266 Medline TA: Eur J Appl Physiol Occup Physiol Country: GERMANY, WEST |
Other Details:
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Languages: eng Pagination: 197-202 Citation Subset: IM |
Affiliation:
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FNRS--Belgium, Laboratory of Human Applied Physiology, Liege. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Bicycling* Humans Kinetics Models, Biological Oxygen Consumption* Physical Education and Training Sports* Time Factors |
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