ИСТИНА

Background. The numbers of studies (Bazanova&Vernon, 2013; Mierau et al, 2015; Grandy et al, 2013; Angelakis et al, 2004) have shown significant correlations between individual alpha peak frequency and different motor and cognitive abilities. The aim of this study was to investigate the associations between self-regulation ability, postural control and EEG characteristics in students with high and low individual alpha peak frequency (IAPF). Methods. Our sample consisted of 13 male students 18-19 years old. EEG was recorded from 10 cortical leads (Fp1, Fp2, C3, C4, P3, P4, T3, T4, O1, O2). Postural control was assessed as Romberg test performance (in eyes open and eyes closed conditions) on the stabilometric platform ST-150 (Biomera, Russia). Experiment also involved two questionnaires: self-regulation ability and emotional resilience to stress. All students were divided into two groups according to their IAPF: group1 with IAPF>10 Hz and group2 with IAPF<10 Hz. Results. Two groups of students had significant differences (Mann-Whitney test) in some aspects of self-regulation ability, stress resistance (group2 had greater risk for stress-induced disorders), EEG parameters (group2 had higher alpha power and arousal amplitude) and postural control. In addition to the traditional stabilometric parameters, we used an index of mechanical energy (A), which is quantified as energy, spent by patient’s center of pressure in the plane of stabilometric platform, dependent on the mass and stated in Joules (Grohovsky S.S., Kubryak O.V., 2011). Group2 demonstrated enhanced energy index during standing in eyes open and eyes closed conditions. Discussion. In group2 (low IAPF) we found poor resistance to stress and impaired such cognitive functions, as programming and planning. There are significant differences between groups in Romberg ratio, measured as the index of mechanical energy (A in eyes open/A in eyes closed), but not in traditional ratio of surface area (mm2). Romberg ratio is usually calculated by comparing surface area of center of pressure of body sway (mm2) in eyes open and eyes closed conditions. The poor reliability of Romberg ratio, calculated traditionally, depends on the inconsistent index of surface area, which can differ greatly under similar conditions (Kubryak O.V., Grohovsky S.S., 2011). Using the more consistent index of mechanical energy in Romberg ratio can provide results that are more reliable. Conclusion. We conclude that IAPF is related to self-regulation ability. In addition, students with low IAPF were worse in performing Romberg test, were more vulnerable to psychological and other stressful pressure.