Decrease in oxygen uptake at the end of a high-intensity submaximal running in humans.

Détails

ID Serval
serval:BIB_DDCA7CF58CA1
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Decrease in oxygen uptake at the end of a high-intensity submaximal running in humans.
Périodique
International Journal of Sports Medicine
Auteur⸱e⸱s
Perrey S., Candau R., Millet G.Y., Borrani F., Rouillon J.D.
ISSN
0172-4622 (Print)
ISSN-L
0172-4622
Statut éditorial
Publié
Date de publication
2002
Volume
23
Numéro
4
Pages
298-304
Langue
anglais
Notes
Publication types: Clinical Trial ; Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
Résumé
The purpose of the present study was to examine oxygen consumption (VO(2) ) kinetics during severe-intensity running exercise through a four-phase model that considered a decrease in VO(2) at the end of the exercise in light of previous research in which this decrease was only noticed. After determination of maximal oxygen consumption VO(2) max), thirteen highly trained males performed a square-wave running to exhaustion at approximately 95 % of VO(2) max on a level treadmill. VO(2) and ventilatory gas exchange variables were determined breath-by-breath. Computerised non-linear regression techniques incorporating exponential and linear terms were used to describe VO(2) and ventilatory gas exchange variable responses. In contrast with the classical 3-component model that describes the increase in VO(2) for severe-intensity exercise, we observed a 4(th) phase characterised by a significant decrease in VO(2) before exhaustion (slope of VO(2)-time relationship significantly different from a zero value, p < 0.01) in 7 out of 13 subjects. Following a time delay of 31 +/- 44 s after the decrease in VO(2), a significant decrease of minute ventilation (V(E)) was present for 6 of the 7 subjects (p < 0.02). During the exercise for the subjects who decreased V(E), a reduction of 288 +/- 169 ml in tidal volume was associated with an increase of 10.2 +/- 2.4 min(-1) in breathing frequency. These data suggest that the respiratory system might be stressed more for some endurance-trained athletes. The specific link between reduced VO(2) and reduced V(E) remains to be explored.
Mots-clé
Adolescent, Adult, Exercise/physiology, Exercise Test, Exercise Tolerance/physiology, Humans, Lactic Acid/blood, Male, Models, Biological, Oxygen Consumption/physiology, Reference Values, Running/physiology, Time
Pubmed
Web of science
Création de la notice
03/09/2011 20:13
Dernière modification de la notice
20/08/2019 16:02
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