PHYSIOLOGICAL REACTIONS OF CARDIOCIRCULATORY SYSTEM TO LOCAL COOLING OF EXTREMITIES IN YOUNG MALE AND FEMALE, NATIVES OF EUROPEAN NORTH

The paper presents the diagnostic results of apparently healthy girls (n=35 per.) and boys (n=35 per), born and permanently residing in the European North. The aim of the study was to detect peculiarities of hemodynamic parameters' change in reaction to local hand and foot skin cooling. Indices of cardiac function, vascular tone, as well as energy and velocity of blood flow have been studied by means of rheographic device «Rео-Spektr-3». Initial indices and indices straight after cold test (hand dipping into the water with temperature 6 °С) have been registered in surveyed. The same method and temperature were used for foot cooling. It has been stated, that local effect on hand and foot skin thermoreceptors induced statistically significant decrease of heart rate, increase of stroke volume, systolic blood pressure, volumetric blood flow rate, energy flow rate in girls and boys. Besides, the girls had increase in average hemodynamic pressure, linear velocity of blood flow and aortic ventricle capacity. Thus, circulatory response on local cooling to a greater extent typical for girls than boys and in foot cold tests than in hand cold tests.