[Functional-structural changes in the myocardium in systemic physical loading].

By means of ultrastructural and morphometrical methods hearts of 15 white rats have been studied during adaptation to the physical static load. This exercise induced the adaptive changes of the myocardium: hypertrophy and dilatation of the heart chambers. Hypertrophy of the myocardial parts takes place mainly at the expense of increasing of the length and width of cardiomyocytes.