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

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.

Regular participation in sports is associated with enhanced physical fitness and lower fat mass in prepubertal boys

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Cerebral perturbations during exercise in hypoxia

“…Methodological concerns as well as future research avenues are also considered. cerebral perfusion; cerebral oxygenation; cortex excitability; central motor command; endurance WITH THE EXCEPTION of very short or static exercises performed at a high percentage of maximal power (15,19,83), hypoxia deteriorates exercise performance (7, 82). In particular, the maximal aerobic workload (Ẇ max ) that can be sustained during exercise involving large muscle groups (e.g., cycling) is considerably lower in hypoxia compared with normoxia.…”

Influence of extracurricular sport activities on body composition and physical fitness in boys: a 3-year longitudinal study

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