No abstract

Comprehensive anthropometrical examination of 225 schoolchildren of municipal educational institutions of the Surgut district was conducted. The aim of the work was assessment of physical development of high school students constantly living on the territory of Khanty-Mansi autonomous Okrug (KhMAO) - Ugra. Methods. The key anthropometrical indicators: body length and weight, chest circumference were registered according to standard research techniques. Body mass indices, proportionality index and somatotype were calculated to assess children's physical development. Results were analyzed by means of the standard methods of mathematical statistics. All the surveyed were divided into following groups: representatives of indigenous ethnic groups of the North (Khanty) who came for the educational period to boarding schools; metises of the first generation who had one of parents the Khanty's representative; descendants of the alien population. Each group was additionally divided by gender. Results. It was stated that the key anthropometrical indicators in metises had in-between position among experimental groups. Values of body length in metises were closer to those in descendants of the alien population, and body weight and chest circumference - to the indicators of representatives of indigenous ethnic groups of the North. According to body density indices, proportionality of body development and orientation of growth processes metises were more similar to the Khanty's school children. Conclusions. Possibly, adaptation of the alien population of KhMAO - Yugra to climatic factors happened through miscegenation with predominant inheritance of anthropometrical signs of indigenous ethnic groups of the North.

Cardiorespiratory system is the most important part of the body, which provides high life expectancy. Special parameters of heart rate dynamics require the development of new approaches for analysis and prediction. The paper presents a comparison of the effective traditional statistical methods, the conventional (in physics) thermodynamic methods, with methods of chaos theory and self-organization to estimate the parameters of heart rate three age groups of Khanty-women in the aspect of identification of their age characteristics. It is proved that there are few statistical differences between the groups (one-type uncertainty), entropic parameters are also less informative. On the contrary, the quasi-attractor’s parameters in three age groups of women are purposefully changed (decrease) and can be described by the Verhulst-Pearl model, with the calculation of the rate of changes over time. A new method for estimating the age-related changes of cardiac parameters based in the calculation of rate of change of the quasi-attractor’s volume is proposed.

The carried out research has allowed to draw a conclusion that adaptive reactions of an organism of representatives of natives of northern region and native population proceed with various pressure of systems of regulation. The motion of the quasi-tractor along all the coordinates makes it possible to evaluate the physical development of Russian schoolchildren. Anthropometric examinations of children and adolescents allow not only to determine the degree of physical maturation, but also to give an overall assessment of the health status of the children surveyed.