Results of the study on hygienic assessment of the electromagnetic field levels of the electronic information-educational schools' environment showed that the intensity values of the electromagnetic field were within the limits of the permissible levels in conference rooms, in recreation, in canteens, in classrooms and in workplaces of computer and distance-learning rooms. The packages of system units, small servers, microwave ovens, monitors, televisions, laptops, sockets and extension cords were the main sources of electromagnetic radiation in modern comprehensive schools. The values of electromagnetic radiation of ultra-high frequencies in the general education establishments were within the limits of the maximum permissible levels. We have been developed recommendations for the hygienic safety of the information-communication technology use and the equipment and furniture placement in computer classes of comprehensive schools.

The article is devoted to the study of vestibular system functions involved in the perception of educational information in children educational activities. We estimated statokinetic stability and static equilibrium for 164 students of the 2nd grade in traditional (105 children) and innovation (59 children) forms for organization of educational process. At the innovation form children were engaged standing and sitting. It was found that the values of the indicator of statokinetic stability varied from 4.5 ± 0.3 vol. up to 5.9 ± 0.4 vol. (p < 0.05) among boys and from 5.8 ± 0.4 vol. up to 7.8 ± 0.6 vol. (p < 0.05) among girls; at the traditional form, respectively, from 4.9 ± 0.4 vol. up to 5.4 ± 0.5 vol. (p > 0.05) and from 5.5 ± 0.3 vol. up to 5.8 ± 0.4 vol. (p > 0.05) in the dynamics of the school year. Static equilibrium values among boys and girls increased during the school year in both forms of educational process.

The paper presents the results of monitoring of intraschool factors and gives a hygienic assessment of the sanitary and epidemiological wellbeing of schools and the organization of the educational process in schools of Chelyabinsk. It was established that 56.4 % of establishments with satisfactory conditions of stay and education belong to the second group and 0.6 % of schools belong to the third group of sanitary and epidemiological wellbeing. In the study of class schedules, non-compliance with hygienic standards was found in 26.3 % of cases. Subjects of high difficulty level are put the first on schedule in 15.0 % of cases and during 5-8 lessons in 10.0 % of cases. We assessed the anxiety levels of 5-11^th grade students (total 2 032 schoolchildren). High levels of reactive anxiety were found among 35.7 % of students and personal anxiety among 37.0 % of schoolchildren respectively. The most significant causes of psychological discomfort in educational establishments are the conditions of a new digital intraschool environment and educational overload, which can manifest themselves in a high anxiety level among students, which necessitates the development of hygienic principles for the formation of a health-saving environment.

A study of the frequency and intensity of using various types of electronic devises by 229 senior students showed that the average duration of using a computer and a laptop for the holiday period is about 4 hours. This is two times higher than on school days (p < 0.05), the duration of continuous operating time with them is about 3 hours, while on school days it did not exceed more than 2 hours (p < 0.05). We believe that it is necessary to extend the positive experience of health improving activities for the holiday period. The high proportion of child care institutions in the Russian Federation (81.3 %), with about 50 % of the total number of children enrolled in summer health improvement company, allows to be recommended these institutions as a platform for health improving activities. Our methods showed positive results in the children health improving with functional disorders and chronic diseases of the vision organ in the child care institution during the one summer health improvement company. They showed significant positive dynamics of visual acuity in 81 % of cases (p < 0.05), and improved results of the Malinovsky test.

Functional body reserves determine the level of functional systems activity, the state of performance and indicate the impact of environmental factors on health as a whole. The paper presents an assessment of the level of adaptive body capabilities in high school students with different motor activity in innovative school. The study involved 308 students (girls - 211, boys - 97) at the age of 15-18 years. The functional tests with a load are used to assess the functional reserves: Martin Kushelevsky test, Orthostatic Test, Shtange's test, Genchi test, Rhomberg's Test. The method of step counter «Pedometer by ITO Technologies, Inc» and the method of survey «Questionnaires for the study of medical and social causes of deviations in health and diseases in children» are used to assess the motor activity of students. Screening results of the functional reserves level showed that more than half of students in innovation school performed functional tests only satisfactorily, high school students with an excellent level of functional reserves were identified only among girls in 10^th grade (0.6 %). Functional indicators of persons with a higher level of motor activity are higher than those with lower motor activity.

The future of the country is determined by health status of the younger generation. The child body reacts most quickly to all external factors, both positive and negative. According to the indicators of physical development and the health status of the child population, it is possible to judge the socio-hygienic and economic wellbeing, the state of the environment in the region. Indicators of the physical development of children and adolescents are a combination of morphological and functional properties of the organism, characterizing the process of their growth and maturation, endurance to any changes in environmental conditions, lifestyle. In childhood and adolescence, individual indicators of physical development are constantly changing, reflecting the influence of the totality of environmental factors, the nature of nutrition, lifestyle. Changes in morbidity rates are not linear, but there are periods of some decrease in the prevalence of functional disorders and chronic diseases and periods of their rapid increase. The work revealed patterns of changes in the physical development of children and adolescents aged 7 to 17 years, which have occurred during the 2008-2017 period. We have made a prognosis of the changes in the parameters on the further physical development of children and adolescents over the next 10 years.

We studied features of preschool children's nutrition. It was revealed that the quantitative and qualitative characteristics of the average daily rations do not comply with the established requirements of the current regulations. A hygienic assessment of arsenic content in staple foods during the 2005-2016 period in the Primorsky Territory is given. The results of a study of the effects of arsenic content on the morbidity of the digestive system in children are presented. The dynamics of the primary morbidity indicators by average annual values is shown. A statistically significant relationship has been established between the actual concentrations of arsenic in food products and digestive diseases among the children of the Primorsky Territory.

A hygienic assessment of the eating habits of younger schoolchildren of Smolensk was carried out. A survey of307 schoolchildren of 3-4 grades with various parameters of physical development in the field of nutrition and lifestyle was carried out. The respondents' diet showed: insufficient and irregular consumption of food - sources of animal protein (meat, milk and dairy products, fish), lack of vegetables, popularity of fast-food products, sweets and sweet carbonated drinks. The violations in the diet and the level of motor activity are most pronounced in the group of children with overweight and obesity. The results confirm the need to develop preventive measures aimed at developing a healthy eating culture among schoolchildren.

Alumina refineries are among the leading sources of atmospheric air pollution with a wide range of pollutants hazardous to human respiratory organs. It is relevant to study and evaluate the occurrence of the risks for development of respiratory diseases in children living in the area affected by the emission components of an alumina refinery. We assessed air quality of the area under observation and comparison according to monitoring observations, risk of non-carcinogenic effects from the respiratory organs. The content of chemicals in the blood and urine adequate to risk factors was quantified. The structure of individual groups of respiratory diseases was analyzed. The causal relationships of violations of laboratory parameters with an increased content of chemicals in biological media were evaluated. It was found that an aerogenic exposure of chemical pollutants is formed on the territory with the production of metallurgical alumina. It determines the risk for development of respiratory diseases, exceeding an acceptable level up to 49.9 times. In the exposed children, the content of manganese, chromium, nickel, copper, xylenes, formaldehyde and aluminum, fluoride ion in the urine was increased to 4.2 times in relation to the indices in the comparison group. A high level of additional respiratory morbidity(1.8 times) was revealed. Chronic lymphoproliferative diseases of the nasopharynx and inflammatory diseases of the upper respiratory tract (up to 6.6 times more often), inflammatory diseases with a predominance of the mechanism of allergic inflammation ( up to 2.1 times more often)are more often detected in the framework of the respiratory diseases. Negative effects on the part of the respiratory system in the form of activation of antioxidant processes, the development of an inflammatory reaction, local, general and specific sensitization of the respiratory tract were established. It confirms the occurrence of the risks for the development of respiratory diseases in children in the exposure area of the chemical factors of alumina refinery-associated economic activity.

The paper presents the analysis results of the level and structure of students' morbidity of specialized secondary school according to the data of medical control charts (form 062/y). We obtained the data on the impact of the educational environment factors on the basis of the results of assessment of sanitary and epidemiological wellbeing of the college and determined the parameters forming the leading positions in the structure of students' morbidity. A set of measures aimed at the prevention of health losses of the studied group of students is proposed.

The paper presents the results of determining vascular risk due to negative lifestyle factors (physical inactivity, smoking) in young people. The group of respondents (91 people, age 18-20 years) was divided into 3 subgroups depending on the facts of smoking and physical inactivity. The study of endothelium function and elasticity of arterioles was determined using the AngioScan (photo-plethysmographic method for recording the pulse wave) and assessing the shape and state of the capillaries using a capillaroscope (UsB microscope series PW200-PW1600). The criteria for vascular risk were: the stiffness of the vascular wall, assessed using the type of pulse wave (A, B, C), tissue saturation with oxygen, the level of vascular «stress» (based on the dynamics of the pulse rate). By comparing these indicators with AngioScan software, the biological age of the vessels was determined. Relative vascular risk was defined as the ratio of the registered indicators in groups 1 and 2 to the corresponding indicators in group 3 (the control group). By calculating the relative vascular risk, the most sensitive indicators were identified: the type of pulse wave and the magnitude of vascular «stress», which indicate a pronounced tendency to unfavorable prognosis of cardiovascular diseases in this lifestyle.

We conducted a study on the intensity of educational activities and determined the typology of the physiological reactions of the body of each of students with different levels of efficiency. The intensity of the educational process of students is given by the method of V.R. Kuchma, E.A. Tkachuk, N.V. Efimova, I.V. Mylnikova (2015) with a scoring of intellectual, sensory, emotional loads, mode and monotony of educational work. A survey of295 students divided into three groups of 60 people was conducted at a time. There were students with a normal level of efficiency, with reduced efficiency and with significantly reduced efficiency. The functional state of the central nervous system, the autonomic nervous system was determined on the hardware-software complexes based on the methods of, respectively, variational chronoreflexometry and pulsometry. The leading factors of students' educational activities were high intellectual, visual loads and irregular schedule of academic work, which were assigned to class 3 of 2nd degree on unsocial conditions. In conditions of intense learning activities, only every third student had a normal level of efficiency. We have established the fact of a decrease in the functional state of the central nervous system, stability of the nervous response, adaptive capacity due to the intra-system mismatch of the autonomic nervous system departments and its regulation levels in students with reduced and significantly reduced efficiency as compared with students with normal efficiency. Those can become a scientific basis for the formation of targeted preventive measures to improve the level of efficiency through the normalization of these physiological processes.

In modern conditions, constant monitoring of the level of physical development is necessary, as this is the diagnostic key of the risk of developing diseases and taking prevention activities. The screening data of the physical development of 832 senior schoolstudents and first-year students at Pacific State Medical University (434 young men and 398 girls) aged 15-18 years were used. The assessment of physical development was carried out with anthropometric and functional traits. The individual level of physical development is determined using the method of sigmal deviations. Statistical processing of materials was carried out using the software STATISTICA 13 and Excel (Microsoft Office 2010). Testing the hypothesis for the normal distribution of quantitative traits in groups was carried out using the Kolmogorov-Smirnov, Shapiro-Wilk, Kramer-von-Mises criteria and the Pearson X acceptance criterion. All the data arrays obeyed the normal distribution law. A statistically significant difference in the groups between the quantitative parameters under the condition of equality (homoscedasticity) of the variances was evaluated using the parametric Student's t-test. The average values of the physical development of the youth of Vladivostok are established. Physiometric signs showed statistically significant differences between the mean values of the vital capacity of the lungs and the dynamometry of the right hand between young schoolboys and young male students, and the average values of the strength of the right arm of schoolgirls and female students. Most of the examined persons had a moderate physical development, but predominantly girls have a lack of body weight, and young male students are prone to obesity. Levels of life index and power indices below the norm are more than 50 % of respondents. The differences in statistical indicators are significant with a degree of significance of p < 0.05. The data obtained as a result of the research are necessary for the development of preventive programs to enhance the physical development and promote the health of the young generation.