Dynamic Responses of Oxygen Uptake at the Onset and End of Moderate and Heavy Exercise in Trained Subjects

Inconsistencies about dynamic asymmetry between the on- and off-transient responses in are found in the literature. Therefore the purpose of this study was to examine on-and off-transients during moderate- and heavy-intensity cycling exercise in trained subjects. Ten men underwent an initial increme...

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Bibliographic Details
Published in:Canadian journal of applied physiology 2004-02, Vol.29 (1), p.32-44
Main Authors: Cleuziou, Christophe, Perrey, Stéphane, Borrani, Fabio, Lecoq, Anne Marie, Candau, Robin, Courteix, Daniel, Obert, Philippe
Format: Article
Language:English
Subjects:
Adolescent
Adult
Analysis of Variance
Bicycling - physiology
Biological and medical sciences
Exercise
Fundamental and applied biological sciences. Psychology
Health aspects
Humans
Kinetics
Least-Squares Analysis
Male
Models, Biological
Oxygen Consumption
Physical Education and Training
Physical Endurance
Pulmonary Gas Exchange
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
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Summary:Inconsistencies about dynamic asymmetry between the on- and off-transient responses in are found in the literature. Therefore the purpose of this study was to examine on-and off-transients during moderate- and heavy-intensity cycling exercise in trained subjects. Ten men underwent an initial incremental test for the estimation of ventilatory threshold (VT) and, on different days, two bouts of square-wave exercise at moderate ( VT) intensities. kinetics in exercise and recovery were better described by a single exponential model ( VT). For moderate exercise, we found a symmetry of kinetics between the on- and off-transients (i.e., fundamental component), consistent with a system manifesting linear control dynamics. For heavy exercise, a slow component superimposed on the fundamental phase was expressed in both the exercise and recovery, with similar parameter estimates. But the on-transient values of the time constant were appreciably faster than the associated off-transient, and independent of the work rate imposed ( VT). Our results do not support a dynamically linear system model of during cycling exercise in the heavy-intensity domain. Key words: oxygen uptake kinetics, on- and off-transients, slow component
ISSN:1066-7814
1543-2718
DOI:10.1139/h04-003