Features of autonomic reactivity in short track runners during anaerobic tests based on heart rate variability

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Dr. Biol., Professor T.M. Bruk1
Dr. Biol., Professor F.B. Litvin1
Dr. Biol., Associate Professor P.A. Terekhov1
PhD, Associate Professor E.V. Safonenkova1
1Smolensk State University of Sports, Smolensk

Objective of the study was to assess the level of autonomic reactivity in short track athletes when performing anaerobic tests of varying duration.
Methods and structure of the study. The study involved 18 12-year-old male adolescents of the 1st category skill level. The study was conducted using the Varicard 2.51 device with the Integrated Cardiointervalometry System (IСIMS) software, version 6.2.
Results and conclusions. In the age group of 12-year-old adolescent boys, the third type of regulation prevails (moderate prevalence of parasympathetic activity). Evaluation of the level of vegetative reactivity in the orthostatic test revealed different types of reaction from optimal and hyperreactive to paradoxical. After 6 s of load in orthostasis, vegetative reactivity occurs against the background of an optimal decrease in the activity of the parasympathetic division and a hyperreactive increase in the sympathetic division of the ANS. An increase in the duration of the load to 15 s is accompanied by a further increase in the tension of the regulatory systems, as evidenced by the maximum value of SI and the minimum values ​​of TP, HF, VLF. With a load lasting 45 s, the activity of the autonomous circuit increases relative to 6 s and 15 s of work, which reflects an increase in the MxDMn, RMSSD, HF indicators, the activity of the central circuit decreases with a decrease in the AMo, SI, LF / HF, IC indicators. Stress resistance increases against the background of optimization of vegetative reactivity.

Keywords: heart rate variability, autonomic reactivity, orthostasis, short track, exercise.

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