The article presents a characteristic of the functional state of biathletes during the preparatory period using the method of assessment of variability of heart rhythms (HRV). The purpose of the study - to determine the dynamics of the functional status of biathletes during the preparatory period of the one-year preparation cycle by estimating the variability of heart rhythms. The objectives of the study were research of the HRV biathletes before physical activity, study of trends in indicators during the preparatory period. The research was attended by youths (10 persons) - members of the National State University named after P.F. Lesgaft biathlon team. The measurements were carried out using the software-hardware complex "Dynamics, Omega-pro". The analysis of the obtained data was carried out in accordance with the method of R.M. Bayevsky. It was found out that the group of biathletes has a slight decrease in the functional state according to the HRV indicators, and adjustment of training programs is required.
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