Parameters of heart rate variability (HRV) in teenagers have been studied by the cluster analysis to establish the variants of heart rate (HR) regulation in the forming adaptive reactions. The following results have been obtained: HR regulation options in teenagers with different contribution of central and peripheral structures to HRV formation mechanisms; the role of peripheral nervous system in cardiac arrhythmias genesis in teenagers has been confirmed, that is accompanied by the growth of the full spectrum power with the preservation of typical variants of HR regulation; for teenagers with normal sinus HR without clinical signs of the autonomic dysfunction syndrome, the HRV parameters have been obtained which can be proposed as standards for the given age group and used to interpret HRV results; other variants of HRV reflect boundary cases and are clinically interpreted as the vegetative lability under conditions of intensive development and establishment of systems in adolescence.
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