The aim of the study is to identify the features of functional state (FS) of children of senior preschool age and first grade students, manifested in the conditions of information loads. Methods. The study involved healthy children of the senior preschool age (n = 112) and first grade students (n = 137). We studied FS in four experimental situations: "comfortable wakefulness", "mobilization readiness", "load with a comfortable speed", "load with a maximum speed". Heart rate, ю-potential (OD), blood pressure were recorded. Anxiety and activity effectiveness were determined. The statistical significance of the differences was determined on the basis of Student t-test. Results. Information loads cause an increase in the level of CNS activation in children, an increase in the tension of regulatory systems and a shift in the autonomic balance towards the predominance of activity of the sympathetic division of the ANS. The most pronounced changes in the FS occurred during operation at maximum speed. Under these conditions, in senior preschool children, the shift in OD was 14,8 ± 1,3 mV (p < 0,001), heart rate (HR) 9,7 ± 1,1 beat/min (p < 0,001), average duration of the RR interval (RRNN) -31,4 ± 15,2 ms (p = 0,041), the spread of cardio intervals (MxDMn) -62,1 ± 13,9 ms (p < 0,001), quality of standard deviation (SDNN) -3,6 ± 1,7 ms (p = 0,036), mode amplitude (АМо) -6,3 ±1 ,9 % (p = 0,002), stress index (SI) 93,1 ± 17,6 rel. units (p < 0,001), systolic blood pressure (SBP) 8,5 ± 1,1 mm Hg (p < 0,001), diastolic blood pressure (DBP) 7,0 ± 0,9 mm Hg (p < 0,001), double product (DP) 21,6 ± 1,6 rel. units (p < 0,001). The shift of ю-potential among first grade students was 22,4 ± 1,4 mV (p < 0,001), HR 12,7 ± 1,2 beat/min (p < 0,001), RRNN -55,0 ± 11,3 ms (p < 0,001), MxDMn -67,3 ± 12,0 ms (p = 0,003), SDNN -7,2 ± 1,9 ms (p < 0,001), АМо 3,3 ± 1,3 %, (p = 0,012), SI 116,5 ± 18,1 rel. units (p < 0,001), SBP 13,2 ± 1,6 mm Hg (p < 0,001), DBP 6,5 ± 1,6 mm Hg (p < 0,001), DP 15,3 ± 1,8 rel. units (p < 0,001). It was found that the efficiency at the maximum speed is lower than under loads performed at a comfortable speed. Conclusions. Psychophysiological value of activity in preschool children is higher and its effectiveness is lower than among first grade students. Two types of response to the information load have been found out.
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