VEGETATIVE SUPPORT OF THE HEART ACTIVITY OF ADOLESCENT STUDENTS IN THE CONDITIONS OF LOW AND MIDDLE MOUNTAINS OF KYRGYZSTAN
The article reflects the results of studying the indicators of cardiointervalography (CIG) of adolescents, girls and boys, low and medium mountains, studying in secondary schools. To determine the autonomic functions, the Martine exercise test was used. Rhythmogram recording and blood pressure measurements during rest and after a test of 5 minutes. During statistical processing, the following indicators of CIG were assessed: the amplitude of the mode (AMo) and the index of the tension of regulatory system (IT). The amplitude of the mode - the maximum value of the distribution density function of R-R intervals - is the degree of rigidity of the heart rate at the most probable level of the functioning of the cardiovascular system. This indicator reflects the stabilizing effect of centralization of heart rate control, which is mainly due to the degree of activation of the sympathetic division of the autonomic nervous system. The index of tension of regulatory systems characterizes the activity of the mechanisms of sympathetic regulation, the state of the central circuit of the body’s regulation. The study revealed the differences in the functional state of the autonomic nervous system of schoolchildren in low and medium mountains. The majority of adolescents (67-71 %) of low and medium mountains revealed a normotonic type of autonomic support of activity, 21-28 % - hypotonic, 8-11 % - hypertonic.