The authors examined 233 patients after myocardial infarction. The principal and control groups were formed at random. The principal group was composed of patients who had undergone complex stage-by-stage rehabilitation. The changes in the working capacity were determined by the bicycle ergometry test. It was established that the values of physical working capacity were significantly higher in patients of the principal group than in patients of the control group. The effect of the rehabilitation program was different in various age groups. It was most favourable in patients over 45 years of age. A significant difference was also disclosed in the parameters of the physical working capacity depending on the character of psychological readaptation.