E.V. Krivonogova - Ph.D. (Biol.), Senior Research Scientist, Laboratory of Biorhythmology, Institute of Environmental Physiology, Ural Branch, RAS, Arkhangelsk, Russia. E-mail: elena200280@mail.ru L.V. Poskotinova - Dr.Sci. (Biol)., Associat Professor, Head of Biorhythmology Laboratory, Institute of Environmental Physiology, Ural Branch, RAS, Arkhangelsk, Russia. E-mail: liliya200572@mail.ru D.B. Demin - Ph.D. (Biol.), Senior Research Scientist, Laboratory of Biorhythmology, Institute of Environmental Physiology, Ural Branch, RAS, Arkhangelsk, Russia. E-mail: denisdemin@mail.ru

The aim was to identify the electroencephalography (EEG) changes in heart rate variability biofeedback (HRV BF) depending on the serotonin level in the peripheral blood in girl-s livening in Polar and Subpolar regions of the Rus-sian North. 75 healthy girls (15-17 years old) were attended in research. HRV BF short-term session (5 min) was conducted by the method of L. Poskotinova and Yu.N. Semenov (patent №2317771). The increasing of HRV total spectral power (TP, mc2) and decreasing of stress-index (SI) were criteria for the HRV BF success. The EEG power spectrum (PS) in the alpha, beta and theta frequencies ranges was recorded using an electroencephalograph «Encephalan» (Medicom, Taganrog). A serotonin level is determined in serum by enzyme immunoassay using a set of «Serotonin ELISA» (Germany) by Stavinskaya O.A. It was found that serotonin levels were higher in girls livening in Polar region (PR) than girls from Subpolar region (SR), while in girls from PR in 30% of cases there was a low serotonin level. In the I group were included persons from SP whose serotonin levels were below 80 ng/mL - 59.2 (53.5; 62.5) ng/ml, in the II group - persons from SP with serotonin level 151.4 (87.2; 191.7) ng/ml, in the III group - persons from PR with 365.8 serotonin levels (287.3; 427.2) ng/ml. All the girls had a significant increasing of TP and decreasing of SI. In girls from group I SM α-, β- and θ- EEG activity was decreased. In group II, there was an increase in girls SM α ? activity of EEG oscillations in the certain brain regions (frontal, central, parietal, temporal parts). In the girls group III CM significant changes EEG oscillations have not been identified. Thus, a relatively low serotonin concentration of serum at HRV BF reflected on the strength of cardiovascular afferent input to the central nervous system and the degree of excitation neuronal structures of the brain involved in regulating heart rate, apparently due to the relative increase noradrenergic activity. This work was supported in part by a Program of the UB RAS Presidium №15-15-4-9.

 

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