title: Pre-exposure to hyperoxic air does not enhance power output during subsequent sprint cycling.
abstract: Previous studies have indicated that aerobic pathways contribute to 13-27% of the energy consumed during short-term (10-20 s) sprinting exercise. Accordingly, the present investigation was designed to test the hypothesis that prior breathing of oxygen-enriched air (F(in)O(2) = 60%) would enhance power output and reduce fatigue during subsequent sprint cycling. Ten well-trained male cyclists (mean +/- SD age, 25 +/- 3 years; height, 186.1 +/- 6.9 cm; body mass, 79.1 +/- 8.2 kg; maximal oxygen uptake [VO(2max)]: 63.2 +/- 5.2 ml kg(-1) min(-1)) took 25 breaths of either hyperoxic (HO) or normoxic (NO) air before performing 15 s of cycling at maximal exertion. During this performance, the maximal and mean power outputs were recorded. The concentration of lactate, pH, partial pressure of and saturation by oxygen, [H(+)] and base excess in arterial blood were assessed before and after the sprint. The maximal (1,053 +/- 141 for HO vs. 1,052 +/- 165 W for NO; P = 0.77) and mean power outputs (873 +/- 123 vs. 876 +/- 147 W; P = 0.68) did not differ between the two conditions. The partial pressure of oxygen was approximately 2.3-fold higher after inhaling HO in comparison to NO, while lactate concentration, pH, [H(+)] and base excess (best P = 0.32) after sprinting were not influenced by exposure to HO. These findings demonstrate that the peak and mean power outputs of athletes performing short-term intense exercise cannot be improved by pre-exposure to oxygen-enriched air.
authors.affiliation: Institute of Training Science and Sport Informatics, German Sport University Cologne, Cologne, Germany. sperlich@dshs-koeln.de
authors.forename: Billy
authors.initials: B
authors.lastname: Sperlich
authors.forename: Thorsten
authors.initials: T
authors.lastname: Schiffer
authors.forename: Silvia
authors.initials: S
authors.lastname: Achtzehn
authors.forename: Joachim
authors.initials: J
authors.lastname: Mester
authors.forename: Hans-Christer
authors.initials: HC
authors.lastname: Holmberg
mesh_terms: D000328:Adult; D001642:Bicycling; D005080:Exercise Test; D006801:Humans; D006863:Hydrogen-Ion Concentration; D018496:Hyperoxia / Q000097:blood / Q000503:physiopathology*; D001239:Inhalation; D019344:Lactic Acid / Q000097:blood; D008297:Male; D009119:Muscle Contraction; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000378:metabolism / Q000503:physiopathology*; D010100:Oxygen / Q000097:blood / Q000378:metabolism*; D010101:Oxygen Consumption; D010313:Partial Pressure; D013997:Time Factors; D055815:Young Adult
chemical_list: D019344:Lactic Acid; D010100:Oxygen
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