Introduction: Nowadays, studying the features of influence of mobile devices on stereotypes of children’s behavior and communication between children and adults acquires special significance. In modern conditions, a child loses the need for verbal communication and physical activity devoting almost all leisure time to virtual space. As a result, along with the development of specific features of cognitive functions in children their physical activity reduces significantly posing health risks and contributing to excess body weight, obesity, diseases of cardiovascular and nervous systems. Our objective was to evaluate the effectiveness of restrictions imposed on the use of cellphones at schools. Materials and methods: The study was conducted in Novosibirsk in January – March 2020. It involved 454 school children including 228 children who did not use cellphones during school breaks (observation group) and 226 children who actively used cellphones during breaks and lessons (control group). Results: The observation group was characterized by significantly higher energy expenditures related to physical activities with a dynamic component during breaks (p≤0.05) as confirmed by objective data collected by a Polar V800 pulsometer with Polar H10 heart rate sensors, a higher percentage of verbal communications (81.2% against 21.2%), a lower prevalence of posture disorders as detected by computer topography (32.8% against 65.8%) and signs of overexertion of the visual apparatus during the school day among the children having functional visual loss (34.6% against 69.2%). Conclusions: The results prove the effectiveness of restrictions imposed on the children’s use of cellphones at school.

Introduction. The article examines the problem of creating healthy learning environments for children and adolescents. The purpose of this research is to identify the characteristics of functional state of schoolchildren’s adaptation system in conditions of limited use of mobile communication devices. Materials and Methods. Data for this study were collected using a hygiene experiment. The sample consisted of 355 schoolchildren. The observation group (n=155) included students separated from their mobile communication devices. The control group consisted of 180 students. The study involved evaluating the functional state of the adaptive capacity of compensatory adaptive mechanisms using generally accepted R. M. Baevsky’s method, modified for the purposes of the research. The identified indicators were subjected to statistical processing. The authors employed the following methods of theoretical research: comparison, formalization, generalization and system analysis. Results. The authors provide an international overview of interventions aimed at reducing mobile phone use in educational settings. The relationship between the state of schoolchildren’s adaptation mechanisms within all age groups and indicators of the cardiovascular system in conditions of separation from mobile communication devices was studied. The authors focus on the values of schoolchildren’s adaptive capacity in conditions of free use of mobile phones during the school day compared to the values obtained in conditions of smartphone separation. The study reveals the correlation between the activity and sensitivity of vegetative regulation of heart rate and gender and age characteristics. Conclusions. The research findings confirm the effectiveness of the restrictions imposed on the use of personal mobile communication devices at comprehensive schools. The authors conclude that limited use of mobile communication devices prevents reducing adaptive capacity of the child's body, therefore it reduces the risk of fatigue and pathological changes.

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Introduction. This article presents the results of a large-scale research on monitoring the nutrition of students in educational institutions. Nutrition is one of the leading factors determining the health and harmony in the processes of growth and development of the child population. One of the most common consequences of unhealthy eating behavior is overweight and obesity. The study and early detection of risk factors is necessary for the prevention of overweight and obesity, which are an acute problem of modern science and education. The purpose of the study is to assess risk factors for overweight and obesity in schoolchildren in order to develop effective programs for the prevention of childhood obesity and nutritional diseases. Materials and Methods. The research data were collected and processed via the following methods: a questionnaire, analytical and statistical methods using parametric and non-parametric methods of statistics and t-test (in the case of normal distribution of data) and Fisher (U). Differences were considered statistically significant at p<0.05. The STATISTICA-10.0 package and Microsoft Excel were used. Results. As part of the global monitoring of schoolchildren’s nutrition (the survey covered 43.9 thousand schoolchildren from 49 regions of the Russian Federation), the following key risk factors for nutrition-related health disorders in schoolchildren were identified: a violation of the structure of nutrition, unhealthy eating behavior and eating habits, violations in the organization of nutrition in educational institutions and at home. Statistically significant correlation coefficients were found between indicators of normal body weight and family income, between overweight and unhealthy eating habits, and eating behavior, the prevalence of diseases of the digestive system. Forecast indicators of a decrease in the prevalence of obesity with a decrease in the proportion of children with unhealthy eating habits have been established. Conclusions. The results of the study characterize the key risk factors for the development of overweight and obesity in children associated with nutrition. In the future, the results obtained can be used to predict the effectiveness of implemented preventive measures at the level of individual educational institutions and territories of the Russian Federation.

Introduction: In the Russian Federation, much attention is traditionally paid to military education and training. A special place in its structure is occupied by the system of cadet classes and corps. A distinctive feature of the learning mode in such institutions is a combined effect of standard and specific factors of indoor school environment and intensive physical activity owing to sports, applied military and drill training. No evidence-based methods of establishing nutrient requirements of children in modern conditions of cadet corps have been developed so far, which predetermines the potential of transforming nutrition from a health-saving factor into a health risk factor. Our objective was to provide a scientific substantiation of the model of healthy nutrition for students of cadet-type educational establishments. Methods: The statistical significance of the correlation was evaluated using the Student’s t-test. Correlation and regression analyses were used to assess cause-and-effect relationships. The Pearson correlation coefficient (rxy) was used as an indicator of the strength of the relationship between quantitative indicators x and y, both having a normal distribution. Correlation coefficient (rxy) values were interpreted in accordance with the Chaddock scale. For the purpose of statistical modeling, the method of multiple linear regressions was used. Conclusions: We substantiated the innovative model of organizing healthy nutrition for students of cadet-type schools based on the correlation and regression analyses with determination of statistical significance of the studied characteristics. Its efficiency indicators include an increase in average functional capabilities of students by more than 10 % and a reduction in the probability of developmental disorders by more than 25 %.