Recovery kinetics of oxygen uptake following severe-intensity exercise in runners.

Détails

ID Serval
serval:BIB_37633
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Recovery kinetics of oxygen uptake following severe-intensity exercise in runners.
Périodique
Journal of Sports Medicine and Physical Fitness
Auteur(s)
Perrey S., Candau R., Borrani F., Millet G.Y., Rouillon J.D.
ISSN
0022-4707 (Print)
ISSN-L
0022-4707
Statut éditorial
Publié
Date de publication
2002
Peer-reviewed
Oui
Volume
42
Numéro
4
Pages
381-388
Langue
anglais
Résumé
BACKGROUND: This investigation sought to characterise the oxygen uptake (VO2) off-transient kinetics from severe exercise and to clarify discrepancies between on- and off-transient kinetics for VO2 seen in humans.
METHODS: Eleven competitive endurance athletes underwent treadmill running until exhaustion at work-rates corresponding to the speed that elicited approximately 95% of maximal VO2. Gas exchange variables were determined breath-by-breath. Computerised non-linear regression techniques were used to fit the VO2 on- and off-transient kinetics. A 3-exponential model described the VO2 on-transient. VO2 off-transient was analysed to each response time course using 3 different models: a single-exponential model for the entire period and 2 3-exponential models where exponential terms starting either together after a common time delay or after independent time delays.
RESULTS: Both 3-exponential models provided an excellent fit (r2>0.90) to the off-transient data. Compared with on-transient, VO2 off-transient kinetics was associated with a slower primary phase (time constant: 16+/-4 vs 39+/-13 sec, p<0.01) but was similar both in time delay and amplitude.
CONCLUSIONS: These data indicate that there is no general symmetry between the exercise and recovery kinetics for VO2 because the response of the primary phase of VO2 off-transient resolves to a greater time constant, reflecting altered tissue metabolism. However, the mechanism(s) for the slow component is slow both in developing and to recover within the severe exercise domain.
Mots-clé
Adult, Exercise/physiology, Exercise Test/methods, Exercise Tolerance/physiology, Humans, Kinetics, Nonlinear Dynamics, Oxygen Consumption/physiology, Physical Exertion/physiology, Pulmonary Gas Exchange/physiology, Running/physiology
Pubmed
Web of science
Création de la notice
19/11/2007 10:12
Dernière modification de la notice
20/08/2019 13:25
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