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Hyperoxia and hypoxia influence to adaptive processes at muscular work

In this brief review we will state the use of hyperoxia (HO) in sports training. HO training has been recommended by some authors for athletes to increase their performance. Herewith, there is no reliable knowledge about physiology mechanisms that provides the athlete level of growth during long-term training under HO conditions. Concurrently in the last half century, the athletes’ performance in endurance sports has grown remarkably due to natural and artificial hypoxia application in training process of many kinds of sports. Long-term adaptation mechanisms to muscular work under hypoxia conditions are shortly summarized for comparison with HO effects and we emphasized that the prospectivity of searching the ways for regular usage HO to increase athletic performance is too questionable.