Typological analysis of the spectral density form of the quasi-period duration dynamic series is discussed. The value of areas of slow-wave range is defined in accordance with the typological form of the spectral density. The research was performed on the basis of experimental material obtained in a clinical trial of children and teenagers. This trial was focused on the initial stage of arterial hypertension screening. It was found that within the context of the studied problem, which is focused on initial-stage arterial hypertension detection in infancy and adolescence, the most informative indices are determined by oscillatory components of the dicrotic wave of the pulsation signal.