Article révisé par les pairs
Résumé : A maximal exercise test and hemodynamic studies at rest and during submaximal exercises were performed before and after muscular training in 43 patients with an uncomplicated myocardial infarction and in 11 patients with chronic lung disease. The results were compared with those observed in 34 control patients, 29 with myocardial infarction and 5 with chronic lung disease. Physical working capacity increased 22.1% (p < 0.001) in the trained cardiac patients and 20% (p < 0.05) in the trained pulmonary patients. No improvement was observed in the control groups. This improvement of the maximal working capacity after training was mainly dependent on an increase in the maximal arterio venous oxygen difference. The submaximal data suggest that the hemodynamic changes observed in cardiac patients are largely non specific and correspond mostly to the natural evolution of the cardiac function during the first few mth after myocardial infarction. In pulmonary patients, the favorable evolution of the resting arterial pO2 seems to be related to an improvement of the ventilation perfusion ratio.