title: Study of man during a 56-day exposure to an oxygen-helium atmosphere at 258 mm. Hg total pressure. XII. Clinical observations.
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D000337:Aerospace Medicine; D001274:Atmospheric Pressure; D001774:Blood Chemical Analysis; D018504:Ecological Systems, Closed; D004562:Electrocardiography; D006371:Helium; D006452:Hemoglobinometry; D006801:Humans; D008297:Male; D010100:Oxygen; D010808:Physical Examination
chemical_list: D006371:Helium; D010100:Oxygen