[The informativeness of indices of the heart rate variability for the identification of the adverse effects of environmental factors on the health of adolescent girls].

There was performed an investigation of informativeness of indices of the heart rate variability at rest and during orthostatic testing in the adolescent girls residing in the industrial town and in the village. The influence of unfa- vorable environmental factors was established to be reflected by the indices of the spectral analysis and cardioin- tervalography. In urban girls there was noted the marked increase of the centralization of heart rhythm control on the background of the increased activity of the sympathetic compartment and the reduction of the influence of the parasympathetic compartment of the autonomous nervous system on the sinus node. In rural adolescent girls the func- tional state of the autonomic nervous system being the optimal is characterized by an adequate response to the active orthostatic test of the parasympathetic and sympathetic compartments with the moderate involvement of mechanisms of the central control of the cardiac rhythm. Results of the study have an important significance for the diagnosis of the early disorders of health in adolescent girls.