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Hyperventilation et exercice de sprint prolongé : conséquences sur la performance

Abstract : In this work we study the effects of a voluntary hyperventilation (respiratory alkalosis) on fatigue during a prolonged sprint. We measured the effects of a pre exercise increase of pH during anaerobic exercise. In the first test, seven subjects performed the test of Wingate, either under normal conditions, or after six maximal inspiration/expiry cycles carried out in 30 seconds (HV). The gaseous exchange were measured cycle with cycle during the entire test. The measured peak performances did not differ significantly between the two tests, on the other hand, the index of fatigability was higher when the test was carried out after a hyperventilation. In a second study, 11 subjects performed the test of Wingate either under normal conditions or 1 minute after 30 seconds of hyperventilation. Hyperventilation led to a significant reduction in the partial pressure of CO2 in the air of the end of expiration (PETCO2) below 30 mmHg suggesting a significant decrease of the blood ph. However, the peak power, the average power and the aerobic contribution were not significantly different between the two tests. Finally, in the last study, we recruited 9 high level swimmers, to carry out a 50m crawl either under normal conditions or after a HV followed by 30 seconds of passive recovery. In this study, average speed of the 50m crawls was significantly higher under HV conditions compared to normal conditions. The respiratory number of cycles recorded during each race was significantly lower in the HV conditions. We thus could conclude that a maximal voluntary pre exercise hyperventilation can significantly increase the performances of swimmers of good level at during a 50m crawl
Mots-clés : Alcalose Wingate Acidose
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Submitted on : Tuesday, May 6, 2014 - 11:12:08 AM
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  • HAL Id : tel-00987444, version 1

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Kaissar Kairouz. Hyperventilation et exercice de sprint prolongé : conséquences sur la performance. Education. Université Rennes 2, 2013. Français. ⟨NNT : 2013REN20064⟩. ⟨tel-00987444⟩

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