[Tolerance for hypokinesia in persons adapted to high mountains]

After a 26-day exposure to an altitude of 3200 m test subjects were kept in bed for 10 and 24 days. Each experimental group consisted of 6 test subjects. Physiological effects of the exposure were measured with respect to changes in the respiration, circulation and red blood systems as well as in the orthostatic and exercise tolerance. High altitude adaptation which preceded bed rest did not arrest the development of orthostatic intolerance or the decrease of physical performance that resulted from the bed rest experiment.