The structural-functional state of the left ventricle of boys aged 8-12 years going in for middle-distance racing (the 1st group), swimming (the 2nd group) and wrestling (the 3rd group) has been studied by the method of echo-, poly- and electrocardiography. It is found that posterior wall of the ventricle myocardium is thicker, size of its anteroposterior cavity as well as cavity volume and total volume are larger, the myocardium mass is higher in younger sportsmen as compared with non-sportsmen of the same age. These data indicate the development of ventricular hyperfunction in both isometric and isotonic regimes. In trained pupils the heart rate is lower, all the phases of total systole are longer, intrasystolic value is smaller, and myocardium tension index is higher. They are the indicators of economy development in ventricular activity. These differences are the most significant in children developing their endurance.
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