M.D., D.Sc. (Medicine), Professor A.L. Pokhachevsky^{1, 2}
PhD, Associate Professor V.V. Seliverstova³
PhD E.P. Glushkova⁴
Dr.Hab., Associate Professor N.Yu. Nerobeev³
M.D., D.Sc. (Medicine), Professor S.V. Bulatetsky^2
1I. M. Sechenov First MSMU MOH Russia (Sechenovskiy University),Mosсow
²RyazSMU, Ryazan
³State Lesgaft University of Physical Culture, Sports and Health, St. Petersburg
⁴Medical and Sanitary Part of the Ministry of internal Affairs of Russia, Ryazan

Keywords: neurohumoral regulation, heart rate.

The aim of the study is to identify typical markers of neurohumoral regulation of physical quality (FC) "endurance".
Methodology and organization of the study. The functional state of athletes-track and field athletes and polyathletes (43 people) was assessed by spectral analysis of heart rate variability (CP) during an active clinoorthostatic test (AOP). Each athlete has taken into account the results of the control test: cross-country 3 km. Typical markers of neurohumoral regulation were identified by the intensity of correlations (Spearman) of the adaptive characteristics of the athletes ' body with the results of control testing.
Research results and discussion. The negative association (-0.35) with pNN50 indicates the need for large differences in paired CI and is probably related to the necessity of strengthening the rapid regulatory variability of CRH for this FS. In addition, an even more pronounced negative relationship with % HF (-0.53) confirms the desire of adaptive reactions to strengthen parasympathetic influences in order to achieve the best result. A pronounced positive relationship with VLF (0.66) determines the rejection of humoral-metabolic support, since the entire functional pattern is revealed due to the fastest possible component of regulation. The association with the vegetative balance (0.34) is also due to the dominance of HF and mediates the decisive influence of parasympathetic control.
The variability of adaptive reserves during the AOP period, showing a positive relationship with the coefficient of 30/15, demonstrates the absence of the need for parasympathetic reactivity, since the present FC, requiring a long time, and not a sprint effort, does not need the fastest possible involvement of power and energy supply. The requirement for greater parasympathetic participation (-0.7) is probably due to the minimum of this regulatory component during the AOP period. At the same time, this regularity is due, by and large, to the relationship of the best result with the volume of clinoorthostatic variability of this indicator (-0.83), and not its final value. Nevertheless, high values in HF in clinostasis retain a higher level in orthostasis, despite a pronounced drop in intensity, which is reflected in the high level of coupling in the orthostatic position. At the same time, the LF/HF marker, as well as in clinostasis, emphasizes the limiting value of parasympathetic (rather than sympathetic) activity.
Thus, the physical quality of "endurance" requires the dominant, or rather, the exclusive participation of parasympathetic control of neurohumoral regulation in the functional system of the body of athletes, whose special work responds to the development of this quality.

References

1. Pokhachevsky A. L. Comparative monitoring of the functional state of the autonomic nervous system of adolescents / A. L. Pokhachevsky / / Pediatrics. G. N. Speransky Journal. – 2010.– № 3 (89). – Pp. 51-56.