Peculiarities of heart mass changes in relation to body mass of immature rats under different modes of motor activity

The article presents data on the mass of the heart and the ratio of the heart mass to the body mass of rats under different motor modes developed by the authors. Under the influence of the regime of sharply enhanced motor activity there is a significant decrease in the growth of both body weight and heart mass, as a result of which absolute parameters of body mass and mass of the heart of growing rats were significantly lower than in Groups with sharply limited motor activity, and especially intensified motor activity.