Effects of aerobic fitness on oxygen uptake kinetics in heavy intensity swimming.

Détails

ID Serval
serval:BIB_869AFE2442B9
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Effects of aerobic fitness on oxygen uptake kinetics in heavy intensity swimming.
Périodique
European Journal of Applied Physiology
Auteur(s)
Reis J.F., Alves F.B., Bruno P.M., Vleck V., Millet G.P.
ISSN
1439-6327 (Electronic)
ISSN-L
1439-6319
Statut éditorial
Publié
Date de publication
2012
Volume
112
Numéro
5
Pages
1689-1697
Langue
anglais
Notes
Publication types: Journal Article
Résumé
This study aimed to characterise both the [Formula: see text] kinetics within constant heavy-intensity swimming exercise, and to assess the relationships between [Formula: see text] kinetics and other parameters of aerobic fitness, in well-trained swimmers. On separate days, 21 male swimmers completed: (1) an incremental swimming test to determine their maximal oxygen uptake [Formula: see text], first ventilatory threshold (VT), and the velocity associated with [Formula: see text] [Formula: see text] and (2) two square-wave transitions from rest to heavy-intensity exercise, to determine their [Formula: see text] kinetics. All the tests involved breath-by-breath analysis of freestyle swimming using a swimming snorkel. [Formula: see text] kinetics was modelled with two exponential functions. The mean values for the incremental test were 56.0 ± 6.0 ml min(-1) kg(-1), 1.45 ± 0.08 m s(-1); and 42.1 ± 5.7 ml min(-1) kg(-1) for [Formula: see text], [Formula: see text] and VT, respectively. For the square-wave transition, the time constant of the primary phase (τ(p)) averaged 17.3 ± 5.4 s and the relevant slow component (A'(sc)) averaged 4.8 ± 2.9 ml min(-1) kg(-1) [representing 8.9% of the end-exercise [Formula: see text] (%A'(sc))]. τ(p) was correlated with [Formula: see text] (r = -0.55, P = 0.01), but not with either [Formula: see text] (r = 0.05, ns) or VT (r = 0.14, ns). The %A'(sc) did not correlate with either [Formula: see text] (r = -0.14, ns) or [Formula: see text] (r = 0.06, ns), but was inversely related with VT (r = -0.61, P < 0.01). This study was the first to describe the [Formula: see text] kinetics in heavy-intensity swimming using specific swimming exercise and appropriate methods. As has been demonstrated in cycling, faster [Formula: see text] kinetics allow higher aerobic power outputs to be attained. The slow component seems to be reduced in swimmers with higher ventilatory thresholds.
Pubmed
Web of science
Création de la notice
12/05/2012 8:48
Dernière modification de la notice
20/08/2019 14:45
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