[Ultrastructure of the heart muscle in experimental myocardial infarct following physical training]

The ultrastructure of peri- and extra-infarction areas was examined in the left-ventricular myocardium of rats after swimming exercise. The ultrastructural study of cardiomyocytes and blood capillaries has suggested that regular exercise under experimental myocardial infarction improves blood supply to the heart muscle, prevents fibrillogenesis and activates compensatory-adaptive response of the intracellular regeneration type within components of the capillary wall and cardiomyocytes.