Dr. Hab., Professor V.D. Povzun¹
PhD, Associate Professor A.A. Povzun^1
1Surgut State University, Surgut

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.
Thus, it is mandatory to take into account the effects of the time zone offset on the athlete’s body, especially in event of changes in the regulatory status due to the latitudinal displacement. In some cases, the negative effects of such displacement can be eliminated by means of well-constructed recreational activities. In other cases, there is a need for strict hemodynamic treatment of the bodily reaction to physical loads.

References

1. Apokin V.V., Povzun A.A., Rodionov V.A. et al Bioritmologicheskiy analiz izmeneniya adaptatsionnykh vozmozhnostey organizma sportsmenok pri dlitelnykh pereletakh s vostoka na zapad [Biorhythmological analysis of changes in body's adaptive capability of female athletes during long flights from east to west]. Teoriya i praktika fizicheskoy kultury, 2010, no. 11, pp. 95-98.
2. Apokin V.V., Povzun A.A., Povzun V.D. et al. Osobennosti srochnoy adaptatsii serdechno-sosudistoy sistemy u legkoatletov pri shirotnom peremeshchenii [Specifics of urgent adaptation of cardiovascular system in athletes at latitudinal displacement]. Teoriya i praktika fiz. kultury. 2015. No. 12. pp. 81- 83.
3. Iordanskaya F.A., Yudintseva M.S. Monitoring zdorovya i funktsionalnaya podgotovlennost vysokokvalifitsirovannykh sportsmenov v protsesse uchebno-trenirovochnoy raboty i sorevnovatelnoy deyatelnosti [Health monitoring and functional fitness of elite athletes in educational process and competitive activity]. Moscow: Sovetskiy sport. 2006. 184 p.
4. Povzun A.A., Apokin V.V., Peshkov A.A. Otsenka izmeneniya sostoyaniya nespetsificheskoy adaptosposobnosti sportsmenov vysokoy kvalifikatsii po pokazatelyam serdechno-sosudistoy sistemy pri dlitelnykh pereletakh [Evaluation of changes in nonspecific adaptive capability of highly skilled athletes in terms of cardiovascular system during long flights]. Teoriya i praktika fiz. kultury. 2011. No. 9. pp. 87-89.
5. Povzun A.A., Apokin V.V., Povzun V.D. et al. Funktsionalnoe sostoyanie serdechno-sosudistoy sistemyi u legkoatletov Srednego Priobya pri shirotnom peremeshchenii [Functional state of cardiovascular system in Middle Ob athletes at latitudinal displacement]. Teoriya i praktika fiz. kultury. 2016. No. 1. pp. 87- 89.
6. Savinykh L.E., Povzun A.A., Apokin V.V., Kiseleva A.A. Bioritmologicheskiy analiz vliyaniya dlitelnykh pereletov na sostoyanie nespetsificheskoy adaptosposobnosti organizma sportsmenok [Biorhythmological alalysis of influence of long flights on condition of nonspecific adaptability of organism of female athletes]. Teoriya i praktika fiz. kultury, 2010, no. 10, pp. 102-104.