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J Appl Physiol (October 4, 2002). doi:10.1152/japplphysiol.00128.2002
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Articles in PresS, published online ahead of print October 4, 2002
J Appl Physiol, 10.1152/jap.00128.2002
Submitted on February 20, 2002
Accepted on October 1, 2002

Anaerobic energy provision does not limit Wingate exercise performance in endurance trained cyclists

Jose A. L. Calbet1*, Jose A. De Paz2, Nuria Garatachea2, Salvador Cabeza de Vaca3, and Javier Chavarren1

1 Department of Physical Education, Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Las Palmas, Spain
2 Instituto Nacional de Educacion Fisica de Leon, Universidad de Leon, Leon, Leon, Spain
3 Centro de Tecnificacion de Ciclismo, Chiclana de la Frontera, Cadiz, Spain

* To whom correspondence should be addressed. E-mail: lopezcalbet{at}terra.es.

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 5 sprint (S) trained track cyclists from the Spanish National Team performed 30-s Wingate tests in normoxia (Nx) and hypoxia (FiO2 = 0.10) (Hx). Oxygen deficit (O2D) was estimated from submaximal cycling economy tests using a non-linear model. Endurance cyclists showed higher VO2max than S (72±1 and 62±2 ml.kg-1.min-1, P < 0.05). Sprint cyclists achieved higher peak and mean power output, and 33% larger O2D than E (P < 0.05). During the Wingate test in Nx, 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 to Nx, Hx lowered VO2 by 16% in E and S (P < 0.05). Peak power output, fatigue index, and exercise femoral vein blood lactate concentration ([La]) were not altered by Hx in any group. Endurance cyclists, unlike S, maintained their mean power output in Hx by increasing their anaerobic energy production, as shown by 7% greater O2D and 11% higher postexercise [La]. In conclusion, performance during 30-s Wingate tests in severe acute hypoxia is maintained or barely reduced due to the enhancement of the anaerobic energy release. The effect of severe acute hypoxia on supramaximal exercise performance depends on training background.




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