Adaptation of the parts of myocardium of 18 white rats to the physical static loadings during two months have been studied by means of morphometric and histological methods. Physical loadings cause hyperfunction and hypertrophy of all chambers of the heart with a predominant hypertrophy of the right ventricle, right auricle and dilatation of these cavities. The heterogeneous changes of the myocardium were found on the organic level.
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