PMID: 8990202Jan 7, 1997Paper

Newborn primate infants are entrained by low intensity lighting

Proceedings of the National Academy of Sciences of the United States of America
S A RivkeesJ Fortman

Abstract

At the present time we do not know when the circadian timing system of human infants becomes responsive to light. Because of human study limitations, it is not currently possible to address this issue in clinical studies. Therefore, to provide insights into when the circadian system of humans becomes responsive to light, baboons were studied. We first assessed if the biological clock located in suprachiasmatic nuclei (SCN) is responsive to light at birth. When term newborn infants were exposed to bright light at night (5000 lux), SCN metabolic activity and c-fos mRNA expression increased, indicating the presence of photic responsiveness. When photic entrainment of developing rhythmicity was examined in infants, low intensity (200 lux) cycled lighting was sufficient to entrain circadian phase. However, low intensity lighting was not sufficient to induce changes in SCN metabolic activity or c-fos mRNA expression. Phase-response studies indicated that light exposure (200 lux) before the onset of activity most effectively shifted circadian phase. These data provide direct evidence that the SCN are responsive to visually mediated light information in a primate at birth. Further consideration of lighting conditions that infants are e...Continue Reading

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Citations

Aug 27, 1999·Early Human Development·R I StarkM M Myers
Nov 22, 2001·Current Opinion in Pediatrics·S A Rivkees
May 1, 2001·Pediatric Research·M MirmiranP W Nathanielsz
Mar 3, 1999·Proceedings of the National Academy of Sciences of the United States of America·H Hao, S A Rivkees
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Sep 7, 2000·Seminars in Perinatology·S A Rivkees, H Hao
Sep 7, 2000·Seminars in Perinatology·M Mirmiran, R L Ariagno
Aug 4, 2004·Clinics in Perinatology·Scott A Rivkees
Jan 9, 2003·Clinics in Perinatology·Jeffrey M Perlman
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Nov 17, 2017·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Tamara J VarcoeDavid J Kennaway
Mar 27, 2020·International Journal of Molecular Sciences·Chien-Ning Hsu, You-Lin Tain
Mar 23, 2021·Frontiers in Neurology·Luc J M Schlangen, Luke L A Price
Jun 13, 2012·Pediatrics·Caroline GuyerOskar G Jenni
Aug 5, 2003·Pediatrics·Scott A Rivkees

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