The Development of Periodicity of Heart Rate and Respiration During Sleep in Newborn Babies

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Abstract
Polygraphic records of EEG, ocular movements, respiration and heart rate were made continuously in 10 full term babies between 2 and 7 days old. Power spectral analysis was then computed for heart and respiratory rate. The period durations obtained by this method ranged from 20-70 min. Most of the power spectra showed 2 maxima. In many cases cycles of respiration and heart rate were not identical. Newborns have 2 separate cycles with different period durations. Most probably the shorter cycle originates from the fetal life, the longer one represents the development of the periodicity of the adult.

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