Abstract des Autors

Cardiac rate variability indices are widely used in physiology, but now they acquire even more value while allocating predictive markers of sports performance. The lack of reproduction of sports results in competitions due to developing unfavorable prestarting conditions in athletes is an acute problem of modern athletics. Nowadays such changes are diagnosed by means of spectroscopic analysis of cardiac rate, estimating regulatory systems in competitive conditions. The search for predictive criteria of rate changes will promote allocation of the types of vegetative regulation of athletes with varied adaptive features and consequently different results. Sex and age dimorphism has been allocated in the cardiac rate indices of teenaged and junior athletes. The boys' indices of the general power of the spectrum of heart rate exceed the ones for girls. Boys have a trend to dominating high frequency waves, whereas for girls some decrease of the HF range is specific. The strongest reaction to the slow breathing test and orthostasis was marked in the girls aged 12-15. Boys had less significant reorganizations in the frequency range within the given tests. The athletes improving and reproducing their result have the most marked changes in the frequency range in the slow breathing test and the lowest reactivity in the clinoorthostatic test. Athletes with unstable and deteriorating results show the most essential changes in the studied indices in the clinoorthostatic test and the slightest changes in the slow breathing test compared to quiescence. Verf.-Referat