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Developing circadian rhythmicity.

S A Rivkees¹, H Hao

¹Department of Pediatric Endocrinology, Yale University School of Medicine, New Haven, CT, USA. Scott.Rivkees@Yale.edu

Seminars in Perinatology

|September 7, 2000

Summary

The developing circadian timing system is present prenatally and responsive to light in premature infants. Maturation of sleep-wake and hormone rhythms occurs after two months, highlighting the importance of circadian biology in neonatal care.

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EDITORIAL. Why the Consensus for Consensus?

Journal of pediatric endocrinology & metabolism : JPEM·2021

Area of Science:

Chronobiology
Developmental Neuroscience
Neonatal Physiology

Background:

Circadian rhythms are intrinsic biological cycles approximating 24-hours.
The suprachiasmatic nuclei, the body's master circadian clock, form by midgestation in primates.
The developing circadian system in primate infants demonstrates light responsiveness even at premature stages.

Purpose of the Study:

To review the developmental trajectory of the mammalian circadian system.
To highlight the role of light in regulating the fetal and neonatal circadian clock.
To underscore the emerging significance of circadian biology in neonatal intensive care.

Main Methods:

Review of existing scientific literature on circadian rhythm development.
Analysis of evidence regarding prenatal and postnatal maturation of the circadian system.
Examination of the impact of light exposure on the developing circadian clock.

Main Results:

The human and nonhuman primate circadian timing system develops prenatally, with the suprachiasmatic nuclei present by midgestation.
The immature circadian system in primate infants can be modulated by low-intensity light.
Postnatal development shows progressive maturation of circadian outputs, with distinct sleep-wake and hormonal rhythms typically emerging after two months of age.

Conclusions:

Circadian biology is a critical factor in fetal and neonatal development.
Light exposure is a key regulator of the developing circadian system.
Integrating circadian principles into neonatal care is essential for optimizing infant health and development.

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