THE REACTION OF THE HEART AND SYSTEMIC HEMODYNAMICS IN PHYSICAL STRESS IN HUMANS DURING ADAPTATION TO COLD
The article presents the results of research structural and functional response of the heart and systemic hemodynamics to measured physical load during adaptation of man to cold. Method of echocardiography in contrast the temperature of the seasons before and after the load on the body of men of working age, people of Northern European measured morphometric parameters of the heart, heart rate, hemodynamics in the pulmonary artery and in the aorta. During the study of the heart recorded blood pressure manometer. It is noticed that the person after clinoorthostatic active changes of body position chronotropic function of the heart, the systemic and intracardial hemocirculation had no seasonal differences. It was established that irrespective of the thermal regime of the external environment the body's response to short-term physical activity was associated with increased systolic blood pressure, increase heart rate, decrease of the systolic size of the left ventricle, enlargement of the cavity of the left atrium diameter and pulmonary artery. Thus there was an increase in the speed transorting blood flow with an increase in stroke volume and heart minute volume of blood circulation. Along with these changes in winter, relative to summer, found a greater increase in systemic hemodynamics, a lower increase of blood flow velocity in pulmonary artery and heart rate. The results suggest that in humans in the winter when to cold adaptation-induced short-term physical load stress the cardiovascular system is accompanied by a large than in summer, increased systolic blood pressure, less improvement of hemodynamics parameters in the pulmonary artery and chronotropic function of the heart.