ASSESSMENT OF HEART RATE VARIABILITY AS HEALTH CRITERIA IN CHILDREN OF PRIMARY SCHOOL AGE

Relevance. Of particular relevance today is the importance of heart rate variability. Heart rate - the force of contractions, regulated by the sympathetic and parasympathetic divisions of the autonomic nervous system, which is very sensitive to any stressful effects. Differences in clinical manifestations in children are explained by the heterogeneity of the child population, which manifests itself in variations in the strength of stress reactions - adaptation failure, in differences in the terms of "maturation" of functional systems. In children, depending on age, the polymodal nature of responsible reactions are clearly manifested: part shows hypersensitivity to them, part - complete anergy, stability or tolerance, and part meets the average reaction rate, an explanation for this existence of hereditary polymorphism in the human population [1,2]. There are non-specific syndromes that are associated with tension and exhaustion of physiological adaptation mechanisms. From the theory of adaptation, nonspecific protective reactions of the body are primary and arise in response to any damaging effect. Up to a certain point, these reactions remain hidden and appear when adaptation is disrupted, when ecological disadaptation syndromes are found in all their diversity. Based on the generalization of the data accumulated by different authors, Yu.P. Gichev (2000) schematically displayed the sequence of the main environmentally conditioned pre-morbid and pathological changes in the body during prolonged exposure to chemical environmental pollution (OS): pollution OS—> pollution of the internal environment of the body —> tension of adaptation processes —» depletion of physiological reserves —> insufficiency of regenerative-plastic potential and violation of recovery processes —> formation of premorbid conditions —> accelerated aging, disease.

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