[Human energy expenditures during a prolonged stay in a cyclically changing atmosphere]

The paper presents the results of studying man's gas exchange and energy expenditures as related to the composition of a cyclically changing environment of an altitude chamber. The experiments were carried out on a 24-hour basis. The paper gives the environmental parameters that physiologically were most adequate as the training factor. The respiratory reactions suggest that the enclosed environment used is suitable to prevent hypokinesia effects.