title: Effects of hyperoxia during recovery from 5×30-s bouts of maximal-intensity exercise.
abstract: We test the hypothesis that breathing oxygen-enriched air (F(I)O(2) = 100%) maintains exercise performance and reduces fatigue during intervals of maximal-intensity cycling. Ten well-trained male cyclists (age 25 ± 3 years; peak oxygen uptake 64.8 ± 6.2 ml · kg(-1) · min(-1); mean ± s) were exposed to either hyperoxic or normoxic air during the 6-min intervals between five 30-s sessions of cycling at maximal intensity. The concentrations of lactate and hydrogen ions [H(+)], pH, base excess, oxygen partial pressure, and oxygen saturation in the blood were assessed before and after these sprints. The peak (P = 0.62) and mean power outputs (P = 0.83) with hyperoxic and normoxic air did not differ. The partial pressure of oxygen was 4.2-fold higher after inhaling hyperoxic air, whereas lactate concentration, pH, [H(+)], and base excess (P ≥ 0.17) were not influenced. Perceived exertion towards the end of the 6-min periods after the fourth and fifth sprints (P < 0.05) was lower with hyperoxia than normoxia (P < 0.05). These findings demonstrate that the peak and mean power outputs of athletes performing intervals of maximal-intensity cycling are not improved by inhalation of oxygen-enriched air during recovery.
authors.affiliation: Department of Sport Science, Bergische Universität Wuppertal, Fuhlrottstrasse 10, Wuppertal, Germany. sperlich@uni-wuppertal.de
authors.forename: Billy
authors.initials: B
authors.lastname: Sperlich
authors.forename: Christoph
authors.initials: C
authors.lastname: Zinner
authors.forename: Malte
authors.initials: M
authors.lastname: Krueger
authors.forename: Jennifer
authors.initials: J
authors.lastname: Wegrzyk
authors.forename: Silvia
authors.initials: S
authors.lastname: Achtzehn
authors.forename: Hans-Christer
authors.initials: HC
authors.lastname: Holmberg
mesh_terms: D000280:Administration, Inhalation; D000328:Adult; D000388:Air; D056352:Athletes; D001642:Bicycling / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005221:Fatigue / Q000097:blood* / Q000517:prevention & control; D006801:Humans; D006863:Hydrogen-Ion Concentration; D018496:Hyperoxia; D007477:Ions; D019344:Lactic Acid; D008297:Male; D010100:Oxygen / Q000008:administration & dosage / Q000097:blood / Q000494:pharmacology*; D010101:Oxygen Consumption; D010313:Partial Pressure; D010465:Perception; D005082:Physical Exertion / Q000187:drug effects* / Q000502:physiology; D012119:Respiration; D012146:Rest / Q000502:physiology*; D055815:Young Adult
chemical_list: D007477:Ions; D019344:Lactic Acid; D010100:Oxygen