title: WORK TOLERANCE: AGE AND ALTITUDE. REP 63-33.
mesh_terms: D000375:Aging; D000531:Altitude; D019069:Cell Respiration; D004361:Drug Tolerance; D006801:Humans; D005082:Physical Exertion; D010827:Physiology; D012119:Respiration
keywords: AGING; ALTITUDE; EXERTION; PHYSIOLOGY; RESPIRATION