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Title: Pre-exercise hyperventilation can significantly increase performance in the 50-meter front crawl
Other Titles: Une hyperventilation pré-exercice peut significativement améliorer les performances lors du 50-mètre crawl
Authors: Jacob, Christophe 
Keyrouz, César
Bideau, Nicolas
Guillaume, Nicolas
Hage, Rawad El 
Bideau, Benoit
Zouhal, Hassane
Affiliations: Department of Physical Education 
Department of Physical Education 
Keywords: Fatigue
Respiratory alkalosis
Subjects: Sprint
Issue Date: 2015
Part of: Science & Sports Journal
Volume: 30
Issue: 3
Start page: 173
End page: 176
Summary Objectives The aim of this study was to measure the effect of a 30-second pre-exercise maximal voluntary hyperventilation on the performance during a 50 m front crawl. Material and methods Nine well-trained swimmers (5 males [21.0 ± 8.5 years, 181.4 ± 3.5 cm, 71.2 ± 3.9 kg] and 4 females [21.0 ± 8.7 years, 166.2 ± 5.0 cm, 55.2 ± 2.2 kg]) performed a 50 m front crawl sprint either in normal conditions (NO) or after hyperventilation (HV) (6 maximal breathing cycles realized in 30 seconds followed by 30 seconds of rest). Results Average velocity for the 50 m front crawl was significantly higher after HV (1.81 ± 0.13 m.s−1 vs. 1.79 ± 0.14 m.s−1, P < 0.01). As a result, performance improves (27.79 ± 2.01 s vs. 28.08 ± 2.17 s, P < 0.01). The number of breathing cycles recorded during each race was significantly lower under HV compared to NO (1.88 ± 0.92 and 2.66 ± 1.41, P < 0.01). Moreover, the first air intake was significantly delayed under HV conditions (29.55 ± 8.67 vs. 23.55 ± 6.10 m, P < 0.01). The stroke rate was slightly increased under HV conditions while stroke length was kept nearly constant. Conclusion A pre-exercise maximal voluntary hyperventilation can significantly increase performance on the 50 m front crawl in well-trained swimmers.
DOI: 10.1016/j.scispo.2015.02.006
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Physical Education

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