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The enzyme and isoenzyme pattern was investigated in the plasma of patients with ischaemic heart disease (IHD) after exercise (bicycle test). In comparison to the "exercise profile"and "cardiac profile" differences exist between the characteristic changes of IHD patients. IHD patients with severe impairment of the left ventricle showed a changed enzyme pattern after exercise. The LDH-H-activity and the ratio LDH-H/LDH-M were increased between 1.5 and 8 hours after the exercise. The initially increased LDH-H/LDH-M ratio decreased to normal levels about 24 hours after exercise. The isoenzyme pattern after exercise is discussed in relation to the results of complete heart catheterisation.

The effect of combined rehabilitation on the recovery of working capacity was studied in 304 post-infarction patients in Moscow and 294 in Berlin. All the patients were male and below 65 years of age. Combined stepwise rehabilitation promoted the recovery and maintenance of working capacity in myocardial infarction survivors. A number of factors, such as middle and old age, occupations involving moderate and hard physical work, aggravated course of myocardial infarction, and first-class or fourth-class ECG changes by the Minnesota Code were shown to have negative effects on working capacity.