Objective This article examines the effect of inhaling 99.5% oxygen on short-term recovery processes. Method and materials In our pilot study a group of ice hockey players (n=10) completed two Wingate tests within a brief time interval (30 seconds). The entire testing was conducted twice over a period of one week: – the first time Oxyfit (99,5% oxygen) was inhaled during the pause between the tests – the second time a placebo (ordinary air in a bottle with the Oxyfit logo) was used The source of the 99.5% concentrated oxygen inhaled was Oxyfit (made by Linde gas a.s.). Oxyfit is distributed in some European countries under the name O-PUR. Results and conclusion. The results of the research significantly confirmed (p<0.03) a smaller decline in performance for the repeated Wingate test that was conducted following the inhalation of concentrated oxygen when compared with the inhalation of the placebo. In our opinion the pilot study indicates that the inhalation of concentrated oxygen has an influence on short-term recovery processes in the pause between repeated anaerobic exercise.