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Title: Anaerobic energy provision does not limit Wingate exercise performance in endurance-trained cyclists
Authors: Calbet, JAL 
De Paz, J.A.
Garatachea, N.
Cabeza de Vaca, S.
Chavarren Cabrero, Javier 
UNESCO Clasification: 241106 Fisiología del ejercicio
Keywords: Hypoxia
Oxygen deficit
Issue Date: 2003
Journal: Journal of Applied Physiology 
Abstract: The aim of this study was to evaluate the effects of severe acute hypoxia on exercise performance and metabolism during 30-s Wingate tests. Five endurance- (E) and five sprint- (S) trained track cyclists from the Spanish National Team performed 30-s Wingate tests in normoxia and hypoxia (inspired O(2) fraction = 0.10). Oxygen deficit was estimated from submaximal cycling economy tests by use of a nonlinear model. E cyclists showed higher maximal O(2) uptake than S (72 +/- 1 and 62 +/- 2 ml x kg(-1) x min(-1), P < 0.05). S cyclists achieved higher peak and mean power output, and 33% larger oxygen deficit than E (P < 0.05). During the Wingate test in normoxia, S relied more on anaerobic energy sources than E (P < 0.05); however, S showed a larger fatigue index in both conditions (P < 0.05). Compared with normoxia, hypoxia lowered O(2) uptake by 16% in E and S (P < 0.05). Peak power output, fatigue index, and exercise femoral vein blood lactate concentration were not altered by hypoxia in any group. Endurance cyclists, unlike S, maintained their mean power output in hypoxia by increasing their anaerobic energy production, as shown by 7% greater oxygen deficit and 11% higher postexercise lactate concentration. In conclusion, performance during 30-s Wingate tests in severe acute hypoxia is maintained or barely reduced owing to the enhancement of the anaerobic energy release. The effect of severe acute hypoxia on supramaximal exercise performance depends on training background.
ISSN: 8750-7587
DOI: 10.1152/japplphysiol.00128.2002
Source: Journal Of Applied Physiology[ISSN 8750-7587],v. 94 (2), p. 668-676
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Anaerobic energy provision does not limit Wingate exercise performance in endurance-trained cyclists
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