CHANGES IN THE PUMP FUNCTION OF THE HEART OF CHILDREN AT SHARP MOTOR ACTIVITY LIMITATION

This paper deals with the study of the features of changes in the parameters of the pumping function of the heart of children with different levels of physical fitness at a sharp limitation of motor activity. It was revealed for the first time that the heart rate in children systematically engaging in muscle training with a sharp limitation of motor activity during the first three weeks does not undergo any significant changes, and tends to increase only in the fourth week of hypokinesia. Children who do not systematically engage in physical activity and sports show changes in heart rate already at the beginning of the second week of hypokinesia and significant changes at subsequent weeks at a sharp limitation of motor activity. Stroke volume of blood in children systematically engaging in sports does not undergo any significant changes during all four weeks of the limited motor activity, i.e. hypokinesia. Children who do not engage in physical activity and sports had no reliable changes in their stroke volume of blood during all three weeks of hypokinesia, while in the subsequent, i.e., the fourth week of severe limitation of motor activity, the stroke volume significantly decreased. Keywords: pump function of the heart, school-aged children, injuries, hypokinesia, muscle training.