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... 5. The distribution of circadian cycles according to gestational age groups In examining the relationship between circadian rhythmicity and post-conceptional age (PCA), an analysis of the correlation coefficient was performed using the amplitudes of each period. The amplitudes of the heart rate circadian rhythms were positively correlated with PCA in all four periods (Fig. 6). The higher percentages for the existence of circadian rhythms in preterm infants compared to full-term infants suggest that the maternal influence on circadian rhythm may persist in preterm infants more strongly than in full-term infants during the neonatal period. However, the observed increase in circadian amplitude with PCA implies that the magnitude of circadian rhythmicity parallels the maturation of neonates. Further, we analysed the heart rate circadian rhythmicity of infants born with small weight for gestational age (SGA: birth weight and height bellow < -2SDs) during 0-2 postnatal days
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