Physical fitness and tolerances to environmental extremes.
D000222:Adaptation, Physiological; D000337:Aerospace Medicine; D000531:Altitude; D001794:Blood Pressure; D003243:Consciousness; D006339:Heart Rate; D006801:Humans; D000860:Hypoxia; D008297:Male; D005082:Physical Exertion; D010809:Physical Fitness; D011187:Posture; D012119:Respiration; D012399:Rotation