Postgraduate student A.N. Khodanovich
Velikiye Luki State Academy of Physical Education and Sports, Velikiye Luki

Keywords: attention distribution, orienteering, PZMR, SPMR, heart rate variability, biomysh.

Introduction. Currently, in the scientific and methodological literature, issues related to the dynamics of sensorimotor reactions and HRV of orienteering athletes of high grades in competitive practice have not been considered.
The aim of the study is to establish the dynamics of heart rate variability (HRV), sensorimotor reactions and attention distribution of orienteering athletes in the competitive period.
Methodology and organization of the study. To register the parameters of a simple visual-motor reaction (PMR), complex visual-motor reaction (SPMR), HRV and attention distribution (RV), the Biomysh Research KPF-01b software and hardware complex, Nerolab CJSC, Russia, was used. Eight orienteering athletes participated in the study. The subjects were divided into two groups according to their skill level (1st group – MS, n=4; 2nd group – CMS, n=4). The study was conducted during the running orienteering competitions, from July 10 to 17, 2022, during the international Rus competitions and the Championship and the Championship of the Northwestern Federal District. Four samples were taken for each subject, before the start of the competition block and after each of the three competition days.
The results of the study and their discussion. An analysis of the results of the orienteers obtained during the study showed that in MS before the start of the competition cycle, the average time of PMT (220.00±6.22 ms) was significantly shorter by 8.75%, compared with CMR (239.25±10.78 ms). A similar trend was observed after the second competition day (MS – 213.75±7.63 ms; CMS – 251.50±5.20 ms; 17.66%) and the end of the competition cycle (MS – 221.00±12.73 ms; CMS – 249.25±11.53 ms; 12.78%). The CMC showed a significant increase in the time of PMTCT by 3.29% after the second day of competition, compared with the first.
The analysis of the SPMR, RV and HRV data showed the absence of statistically significant differences in the studied groups both before the start of the competition and at various stages of the cycle.
Conclusion. In the study of PZMR, the masters of sports demonstrated a significantly shorter average reaction time both before the start of the competition block and after the second and third competition days. The MS values after loading are less susceptible to fluctuations.

Used literature

1. Gavrilova E.A. Heart rate variability and sport / E.A. Gavrilova // Human Physiology. - 2016. – vol. 42. – No. 5. – pp. 121-129.
2. Khodanovich A.N. Features of indicators of sensorimotor reactions of orienteering athletes specializing in cross-country orienteering in the competitive period / A.N. Khodanovich // Modern issues of biomedicine. – 2023. – vol. 7. – No. 1. – pp. 98-107.
3. Shlyk N.I. Indicators of heart rate variability at rest and orthostasis at different ranges of MxDMn values and their change in track and field athletes in the training process / N.I. Shlyk, A.E. Alabuzhev // Science and sport: modern trends. – 2020. – Vol. 8. – No. 4. – S. 46-66.