[Development of heart rate in newborn infants during quiet sleep].
The small number of investigations of the development of heart rhythm during the first half year of life provide only rough ideas regarding the maturation of heart rate control. In the present study, in 10 newborns, ECG and respiratory effort were recorded in 13 sessions from birth up to the sixth month. The total power (TP), power in the low (LF) and high frequency range (HF), and the ratio LF/HF were used from the heart rate power spectra. All parameters reveal no linear developmental patterns: TP, LF, and HF increase during the first days to a maximum, then decrease subsequently and remain low until the second month. TP and HF increase between the second and sixth month. LF/HF increases up to the second month followed by a decrease down to the sixth month. The developmental courses of TP, HF and LF/HF correlate with the course of breathing rate (BR), whereby high BR is associated with low HF and TP. The results hint at a maturated cardiorespiratory system.
Patzak
A
A
Institut für Physiologie, Universitätsklinikum Charité, Humboldt-Universität, Berlin, Deutschland.
Mrowka
R
R
Lewinsohn
D
D
Schubert
E
E
D002657:Child Development / Q000502:physiology*; D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D005583:Fourier Analysis; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn / Q000502:physiology*; D008297:Male; D017286:Polysomnography; D011603:Psychophysiology; D012016:Reference Values; D012815:Signal Processing, Computer-Assisted; D012894:Sleep Stages / Q000502:physiology*