Dynamic responses of O2 uptake at the onset and end of exercise in trained subjects.

Détails

ID Serval
serval:BIB_37626
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Dynamic responses of O2 uptake at the onset and end of exercise in trained subjects.
Périodique
Canadian Journal of Applied Physiology
Auteur(s)
Cleuziou C., Perrey S., Borrani F., Lecoq A.M., Candau R., Courteix D., Obert P.
ISSN
1066-7814 (Print)
ISSN-L
1066-7814
Statut éditorial
Publié
Date de publication
2003
Peer-reviewed
Oui
Volume
28
Numéro
4
Pages
630-641
Langue
anglais
Résumé
Inconsistencies about dynamic asymmetry between the on- and off-transient responses in .VO2 are found in the literature. Therefore the purpose of this study was to examine .VO2on- 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) and heavy (>VT) intensities. .VO2 kinetics in exercise and recovery were better described by a single exponential model (<VT) or by a double exponential with two time delays (>VT). For moderate exercise, we found a symmetry of .VO2 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 and >VT). Our results do not support a dynamically linear system model of .VO2 during cycling exercise in the heavy-intensity domain.
Mots-clé
Adult, Bicycling/physiology, Humans, Kinetics, Male, Models, Biological, Oxygen Consumption, Physical Education and Training, Physical Endurance
Pubmed
Web of science
Création de la notice
19/11/2007 11:12
Dernière modification de la notice
03/03/2018 16:05
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