Light-induced melatonin suppression at night after exposure to different wavelength composition of morning light

Neuroscience Letters
Tomoaki KozakiKeisuke Hatae

Abstract

Bright nocturnal light has been shown to suppress melatonin secretion. However, bright light exposure during the day might reduce light-induced melatonin suppression at night. The human circadian system is sensitive to short wavelength light. This study evaluated the preventive effect of different wavelengths of daytime light on light-induced melatonin suppression at night. Twelve male subjects were exposed to various light conditions (dim, white, and bluish white light) between the hours of 09:00 and 10:30 (daytime light conditions). They were then exposed to light (300lx) again between 01:00 and 02:30 (night-time light exposure). Subjects provided saliva samples before (00:55) and after night-time light exposure (02:30). A two-tailed paired t-test yielded significant decrements in melatonin concentrations after night-time light exposure under daytime dim and white light conditions. No significant differences were found in melatonin concentrations between pre- and post-night-time light exposure with bluish-white light. Present findings suggest that daytime blue light exposure has an acute preventive impact on light-induced melatonin suppression in individuals with a general life rhythm (sleep/wake schedule). These findings may...Continue Reading

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Citations

Aug 16, 2016·Sleep Medicine·Ståle Pallesen, Janne Grønli
Oct 13, 2018·Chronobiology International·Leena TähkämöAnu-Katriina Pesonen
Aug 30, 2019·Journal of Physiological Anthropology·Akira YasukouchiHiroyuki Furuune
Jun 20, 2018·Journal of Physiological Anthropology·Tomoaki Kozaki, Yuki Hidaka
Dec 20, 2018·Journal of Physiological Anthropology·Soomin LeeTetso Katsuura
Oct 6, 2020·Frontiers in Endocrinology·Zeeshan Ahmad KhanAsamanja Chattoraj
Aug 23, 2019·Journal of Biophotonics·Siegfried WahlIliya V Ivanov
Jul 10, 2019·Frontiers in Neuroscience·Anne-Loes OpperhuizenAndries Kalsbeek
Jun 2, 2020·L'Encéphale·S HartleyS Royant-Parola
Mar 28, 2021·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Taisuke EtoShigekazu Higuchi

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