Objective of the study was to identify changes in the central hemodynamic indices in highly-skilled athletes after a flight across several time zones. Methods and structure of the study. The study included an analysis of the functional state of the cardiovascular system in the female swimmers of the same age group who had the sports qualifications of Masters of Sport and higher. The subjects were examined after flying through several time zones to the training camps and three weeks after their stay outside their habitual time zone. The measurement logic and procedure are described in detail in this paper. The athletes` reaction to physical loads was assessed based on the indicators and indices that reflect the state of both the adaptive and functional capabilities of the cardiovascular system. Moreover, to calculate these values, the data obtained from the biological rhythm evaluation should be sufficient and no load testing should be required. Results and conclusion. Despite its controversy, the index method is quite informative and, with the right choice of estimates, facilitates a quick and cost-effective evaluation of the functional capabilities of athletes and their hemodynamic indices in particular. This makes it possible to plan the training tactics, which, in turn, makes it possible to achieve the maximum sports result at minimum "physiological" and health costs taking into account not only the influence of physical loads but also the effects of changes in the climatogeographic conditions and time zone offset.
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