A master thesis from Aalborg University
The Effect of Acute Low to Medium Altitude Exposure on Repeated 30-Second Sprint-Performance in Well-Trained Cyclists.
[Effekten af akut højde på den gentagne anaerobe præstationsevne]
Author(s)
Term
4. semester
Education
Publication year
2014
Submitted on
2014-06-02
Pages
14 pages
Abstract
Abstract: Background: The purpose of this study was to determine the effect of acute hypobaric hypoxia on anaerobic performance during multiple 30-s Wingate tests. Methods: Five well trained (VO2max > 72.53 ±4.23 ml/min/kg) completed six 30-s Wingate tests, using a within-subject design, under four hypobaric conditions at approximately sea-level, 1000, 2000 and 3000 meters (1013 mbar, 908 mbar, 781 mbar and 696 mbar) on four separate days. VO2 kinetics, mean power output (MP), Fatigue index (FI), Peak Power output (PPO), Kalium+, Natrium and pH were measured after each sprint. For each visit the sprints were averaged. Results: Compared to sea-level and 1000m MP was significantly lower for 2000m and 3000m. FI was signicantly higher at 3000m when compared to sea-level, 1000 m and 2000m. Natrium was found to be significantly higher at 3000m compared to sea-level and 2000 m. pH was significantly lower at 3000 m than at sea-level and 2000 m. No significance was found for PPO, Kalium+ and VO2 kinetics. Conclusion: These results suggests that acute exposure to hypobaric hypoxia impairs 30-s anaerobic performance when altitude >=2000m possibly by reducing pH, the rate of PCr resynthesis and muscle glycogen.
Keywords
Højde ; anaerob ; præstation ; hypoxi ; cykling
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