Factors responsible for the efficacy of rehabilitative treatment of patients with a history of myocardial infarction were defined on the basis of the 2-year follow-up of 235 patients who suffered myocardial infarction, bicycle ergometry data, studies into intracardiac hemodynamics, oxygen supply in exercise tests, and criteria for the significance of the tetrachoric indicator with regard to the confidence limits. In patients who suffered uncomplicated myocardial infarction, prediction of the decreased work fitness in the long-term period is determined by the presence of angina pectoris and arterial hypertension. It has been established that whether will be lowered in future can be judged from the changes seen in the magnitude of the liminal power and the end diastolic volume of the left ventricle during the first 6 months following myocardial infarction.