THE VARIABILITY OF HEART RHYTHM AND CENTRAL HEMODYNAMICS IN PROVIDING ADAPTATION TO THE BODY'S PHYSICAL LOADS OF STUDENTS SPECIALIZING IN VOLLEYBALL

Elevated levels of systolic and diastolic and, respectively, pulse arterial pressure, the highest in the line of attack players. At the same time, they have relatively low values of heart rate and indicate that the supply of trophism is mainly determined by systolic cardiac output. To regulate the heart rhythm of the players in the line of attack, the central and humoral components in the regulation of the heart rhythm are inherent. Against the backdrop of these differences, they have a fairly high level of the total power of the spectrum of heart rate variability, which reflects the absolute level of activity of regulatory systems. Unlike the players in the attack line, for players who are more responsible for defensive actions, high values of the shock volume of blood and, correspondingly, a minute volume with high heart rate values are inherent, which indicates a relatively low heart contractility. Despite the prevalence of the speed-strength component of the activity of central blocking and binding agents, players of these roles have a high level of PWC170∙kg-1, it is determined, in our opinion, by the speed-strength capabilities of the muscle groups of the lower extremities and the functional capabilities of the cardiovascular system. During the restitution phase, inversion of spectral powers occurs due to an increase in the high-volt-wave component with an under-recovery of this attribute in the range of 11,6–72,8%, depending on the playing role.