Intermittent normobaric hypoxia does not alter performance or erythropoietic markers in highly trained distance runners.
Julian CG, Gore CJ, Wilber RL, Daniels JT, Fredericson M, Stray-Gundersen J, Hahn AG, Parisotto R, Levine BD. Intermittent normobaric hypoxia does not alter performance or erythropoietic markers in highly trained distance runners. J Appl Physiol (1985). 2004 May; 96(5):1800-7.