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Aim. The article aims to identify the effect of regular physical activity of medium and high intensity on the functional status of 5–6 and 6–7-year-old children. Materials and methods. The study involved children assigned for health reasons to the main medical group. A set of indicators characterizing the physiological, psychological, and behavioral aspects of the functional status was used. The experimental programs differed in the intensity of physical exercises. Results. Training programs based on high-intensity physical exercises contributed to a significant improvement in the functional status of the body, autonomic supply, physical performance and physical fitness compared to medium-intensity training programs. Comparison of functional indicators in children revealed that in 5–6-year-old children the level of general activation both in a state of calm wakefulness and under information loads at all stages of the study was higher than in 6–7-year-old children, while physical performance and motor fitness, on the contrary, were lower. Conclusion. The obtained results provide the evidence that 5–6 and 6–7-year-old children making physical exercises of high intensity performed better than those who had exercises of medium intensity as resulted from the degree of positive changes in functional indicators.

Today, there is an urgent need to develop simple, reliable and informative methods to measure the informatization level of children’s life that would be suitable for assessing the daily usage rate of computer equipment and digital technologies.

The research purpose is to find out the influence of physical working capability level appeared at the maximal zone, submaximal, high and reasonable power to organism’s functional state and effectiveness of intensive cognitive activity among children at critical periods of development under the conditions of informative-educational environment of modern school. 6-7 aged children (n=134) and 11-12 aged immature girls (n=221) related by the health state to the main medical group have taken part in the research. The research results allow to make a conclusion that at critical periods of development the physical working capability causes a significant influence on children’s FS changes under intensive cognitive activity. A high level of aerobic and anaerobic glycolytic capabilities appeared predominantly at reasonable zones, high and submaximal power on one hand and a high level of anaerobic alactic capabilities appeared in the maximal zone power on the other hand provide the opposite functional effect. The first ones provide the decrease of extra psychophysiological reactivity, increase of intensive cognitive activity effectiveness, and possible, the personal anxiety decrease, the second ones in opposite provide predominantly hypermobility of autonomic systems of 6-7 supply of activity. The obtained data show that the improvement of intensive cognitive activity effectiveness among children and their FS normalization at the conditions of informative-educational environment of modern school can be reached on the base of directed and balanced increase of physical working capability at different zones of relative power.