The effects of red and blue lights on circadian variations in cortisol, alpha amylase, and melatonin.

International Journal of Endocrinology
Mariana G Figueiro, Mark S Rea

Abstract

The primary purpose of the present study was to expand our understanding of the impact of light exposures on the endocrine and autonomic systems as measured by acute cortisol, alpha amylase, and melatonin responses. We utilized exposures from narrowband long-wavelength (red) and from narrow-band short-wavelength (blue) lights to more precisely understand the role of the suprachiasmatic nuclei (SCN) in these responses. In a within-subjects experimental design, twelve subjects periodically received one-hour corneal exposures of 40 lux from the blue or from the red lights while continuously awake for 27 hours. Results showed-that, as expected, only the blue light reduced nocturnal melatonin. In contrast, both blue and red lights affected cortisol levels and, although less clear, alpha amylase levels as well. The present data bring into question whether the nonvisual pathway mediating nocturnal melatonin suppression is the same as that mediating other responses to light exhibited by the endocrine and the autonomic nervous systems.

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Citations

Sep 19, 2012·International Journal of Endocrinology·Mariana G FigueiroMark S Rea
Nov 28, 2012·Journal of Athletic Training·Jiexiu ZhaoDongsen Liu
May 21, 2014·Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft·A Ahamed BashaK Ramesh Rao
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Aug 18, 2012·International Journal of Endocrinology·Mariana G Figueiro, Mark S Rea
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