FEATURES OF AUTONOMOUS REGULATION IN YOUNG PEOPLE WITH DIFFERENT LEVEL OF ARTERIAL BLOOD PRESSURE

The purpose of the study is to investigate features of autonomous regulation in persons aged 18-22 years with different levels of blood pressure (BP). Materials and methods. The study involved 40 people aged 18-22 years with a normal body mass index, with no identified chronic illnesses or bad habits. All people were run a 30-squat Ruffier test in 2 minutes. Measurements of blood pressure were performed before and after physical activity by the Korotkov method. Cardiac rhythmography was performed before and after exercise. Analysis of heart rate variability was performed using Bayevsky method. Statistical analysis was performed using Mann-Whitney u-test, using Microsoft Excel and Statistica 10 software. Results. The average dynamic pressure in subjects with systolic blood pressure(SBP) is ≤ 119 mmHg after physical activity significantly less than the level of this indicator in the subjects from other groups. The results of Ruffier test indicate a higher level of functional reserves in the surveyed with SBP ≤ 119 mmHg. The analysis of heart rate variability revealed the poorer adaptation of regulatory systems to exercise of individuals with SBP> 130 mmHg. Discussion. The data obtained indicate a greater reserve of the cardiovascular system in the subjects from group I. The conducted analysis of heart rate variability found that TP (total area of heart rate variability in cm2), which shows the total absolute level of activity of the control systems after physical activity, is significantly higher in the subjects from group III compared to those from groups I and II. Such results indicate a worse adaptation to physical activity in group III individuals. The SDNN (standard deviation of the full array of cardio intervals) is also significantly higher in the subjects of group III. We found a significant decrease after exercise of VLF (very low frequency), LF (low frequency) and HF (high frequency) indices in subjects from group I, which indicates a normal reaction to physical activity of all parts of the autonomic nervous system. The subjects of group II after exercise significantly decreased the VLF and HF, which is explained by the adequate response to physical activity from the parasympathetic system and hormonal influences. In group III individuals, only VLF decreased significantly in response to physical activity. The results are a consequence of inadequate response of the sympathetic part of the autonomic nervous system to exercise. Conclusions. A significant difference in mean dynamic pressure after physical exertion was established between individuals with systolic blood pressure ≤119 mmHg. and persons with systolic blood pressure of 120 - 129 mmHg and between persons with systolic blood pressure ≤119 mmHg and individuals with systolic blood pressure ≥ 130 mmHg that indicates a higher tone of sympathetic autonomic influences in individuals with higher levels of blood pressure. On the basis of the Rufier sample, a higher level of functional reserves was found in the examined with systolic blood pressure ≤119 mmHg. Lower adaptive possibilities of autonomous regulation to physical activity in persons with systolic blood pressure ≥ 130 mmHg have been confirmed. based on higher TP and SDNN scores in them. In analysis of cardiorhythmograms, no significant decrease in levels of both LF and HF was observed in the subjects with systolic blood pressure ≥ 130 mmHg as a result of inadequate response of the sympathetic and parasympathetic parts of the autonomic nervous system to exercise.