摘要：Purpose: to study the cerebral blood circulation in people during a tilt-table test depending on the level of nervous processes mobility and physical fitness. Material: to studied compensatory reactions of systemic hemodynamics and blood circulation of the brain to orthostasis in athletes (n=31) and non-athletes (n=31) aged 18-21 years who had different levels of FMNP in rheoplethysmography. First, we examined the level of functional mobility of nervous processes in athletes and non-athletes by the original method, then we divided them into groups with high and low levels of FMNP. The next step was to check hemodynamic parameters in groups with different levels of FMNP and physical performance and recorded them in lying and head-up-tilt positions of the body obtained by passive movement on the turntable at 900. There was a 15-minute pause between lying and head-up-tilt rheograms. Brain rheograms were recorded in the basin of the internal carotid arteries (front-mastoid region) and the vertebro-basilar basin (mastoid-occipital region) of both brain hemispheres. Head-up-tilt test for each subject was used at least 3 times. Results: The obtained results showed that both athletes and non-athletes with a high level of functional mobility of nervous processes were characterized by a low tone of resistive vessels in the internal carotid arteries basin of both hemispheres compared to those with a low level of FMNP. It was compensated by the predominance of the narrowing effect of the elastic type vessels and vascular resistance in the vertebro-basilar basin of the brain, which balanced the processes of cerebral blood flow. Participants with a low level of nervous processes mobility in response to orthostatic load showed opposite changes in cerebral hemodynamics, which was manifested by excessive spastic effect of vascular resistance in the internal carotid arteries and simultaneous vasodilation of resistive vessels in the vertebro-basilar basin of both hemispheres. Conclusion: Athletes with different FMNP showed differences in the economy of the cardiovascular system in favor of people with high level. Therefore, the development of individual training programs and prediction of their effectiveness should be based not only on the information about differences in their physical fitness, but also on the level of their FMNP.
