title: Study of man during a 56-day exposure to an oxygen-helium atmosphere at 258 mm. Hg total pressure. I. Introduction and general experimental design.
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D000337:Aerospace Medicine; D001274:Atmospheric Pressure; D018504:Ecological Systems, Closed; D006371:Helium; D006801:Humans; D008297:Male; D010100:Oxygen
chemical_list: D006371:Helium; D010100:Oxygen