Training in hypoxia vs. training in normoxia in high-altitude natives.

Détails

ID Serval
serval:BIB_3295A698F153
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Training in hypoxia vs. training in normoxia in high-altitude natives.
Périodique
Journal of Applied Physiology
Auteur(s)
Favier R., Spielvogel H., Desplanches D., Ferretti G., Kayser B., Grünenfelder A., Leuenberger M., Tüscher L., Caceres E., Hoppeler H.
ISSN
8750-7587 (Print)
ISSN-L
0161-7567
Statut éditorial
Publié
Date de publication
1995
Volume
78
Numéro
6
Pages
2286-2293
Langue
anglais
Résumé
To determine the interactions between endurance training and hypoxia on maximal exercise performance, we performed a study on sedentary high-altitude natives who were trained in normoxia at the same relative (n = 10) or at the same absolute (n = 10) intensity of work as hypoxia-trained subjects (n = 10). The training-induced improvement of maximal oxygen uptake (VO2max) in hypoxia-trained subjects was similar to that obtained in normoxia-trained sea-level natives submitted to the same training protocol (H. Hoppeler, H. Howald, K. Conley, S. L. Lindstedt, H. Claassen, P. Vock, and E. W. Weibel. J. Appl. Physiol. 59: 320-327, 1985). Training at the same absolute work intensity in the presence of increased oxygen delivery failed to provide a further increase in VO2max. VO2max was not improved to a greater extent by simultaneously increasing absolute work intensity and O2 delivery during the training sessions. In addition, training in normoxia is accompanied by an increased blood lactate accumulation during maximal exercise, leading to greater drops in arterial pH, bicarbonate concentration, and base excess. We conclude that, in high-altitude natives, 1) training at altitude does not provide any advantage over training at sea level for maximal aerobic capacity, whether assessed in chronic hypoxia or in acute normoxia; 2) VO2max improvement with training cannot be further enhanced by increasing O2 availability alone or in combination with an increased work intensity during the exercising sessions; and 3) training in normoxia in these subjects results in a reduced buffer capacity.
Mots-clé
Adult, Altitude, Anoxia/metabolism, Bicarbonates/metabolism, Exercise/physiology, Heart Rate, Hemodynamics, Humans, Lactates/blood, Lactic Acid, Male, Oxygen/metabolism, Respiration
Pubmed
Web of science
Création de la notice
19/09/2013 10:12
Dernière modification de la notice
20/08/2019 13:18
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