ABSTRACT: We have investigated the effect of endurance training on cell metabolism and exercise tolerance in patients with ischemic heart disease. Study population consisted of 24 survivors of myocardial infarction. Patients were assigned to the training group (n=18, mean age 48.2 years) or to the control group (n=6, mean age 42.6 years). Directly before (ExTest I) and after completing a 3-week endurance training program (ExTest II) patients performed bicycle ergometry with computer analysis of ventilatory expired gas (CardioO2, Medical Graphics Corporation). The exercise intensity increased gradually until ventilatory threshold was reached. ExTest II was finished at the same workload level as ExTest I. ECG was recorded and blood pressure was assessed during each ergometry. Prior to and 3 minutes after finishing each test, capillary blood samples were taken for measurements of acid-base equilibrium parameters and lactate concentrations and venous blood samples were collected for assessment of oxypurines and uric acid levels (HPLC method). The training consisted of five 40-min sessions of continuos working on a bicycle ergometer weekly. The workload was 25 W lower than the load at which ventilatory threshold had been reached by the patient. Subjects in the control group did not participate in endurance training. During exercise tests performed after the rehabilitation program, heart rate and rate-pressure product at particular workload were lower than on admission. Similarly, the increases in lactate concentrations and changes in base excess were reduced during ExTest II. The oxypurines pool was reduced after the training, which reflects improvement in cell metabolism. No influence of training on uric acid concentrations was observed.
Biology of Sport. 01/2003;