Dynamic responses of O2 uptake at the onset and end of exercise in trained subjects
| Autor: | Stéphane Perrey, Daniel Courteix, Anne Marie Lecoq, C. Cleuziou, Philippe Obert, Fabio Borrani, Robin Candau |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Adult
Male medicine.medical_specialty Physical Education and Training Physiology business.industry Physical exercise Slow component Models Biological Incremental test Intensity (physics) Bicycling Kinetics Oxygen Consumption Internal medicine medicine Cardiology Moderate exercise Physical Endurance Humans Orthopedics and Sports Medicine Ventilatory threshold business Trained subjects Linear control |
| Zdroj: | Canadian journal of applied physiology = Revue canadienne de physiologie appliquee. 28(4) |
| ISSN: | 1066-7814 |
| Popis: | Inconsistencies about dynamic asymmetry between the on- and off-transient responses in [Formula: see text] are found in the literature. Therefore the purpose of this study was to examine [Formula: see text]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. [Formula: see text] kinetics in exercise and recovery were better described by a single exponential model ( VT). For moderate exercise, we found a symmetry of [Formula: see text] 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 [Formula: see text] during cycling exercise in the heavy-intensity domain. Key words: oxygen uptake kinetics, on- and off-transients, slow component |
| Databáze: | OpenAIRE |
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