PMID: 2120090Aug 20, 1990Paper

The effects of light exposure on plasma concentrations of melatonin, LH, FSH and prolactin in women

Nihon Naibunpi Gakkai zasshi
F MiyauchiY Tsukada

Abstract

The effects of light exposure on plasma concentrations of melatonin, LH, FSH and prolactin were studied in 11 normal cycling women during their follicular phases. Blood samples were obtained via an indwelling venous catheter every 10 min. for 2.5 hours starting at 9:30 and 21:30h. For the blood samplings taken at night, six women were kept in a dark room and were permitted to sleep. Their blood samples were obtained using a flashlight (5-10 lux) without their rest being disturbed. However, the other five women were exposed to light (3,000 lux at eye level) and awakened from 22:40 to 24:00h. Plasma melatonin concentrations in the morning decreased from 48.7 +/- 11.6 pg/ml at 9:30h to 24.7 +/- 4.0 pg/ml at 12:00h. On the other hand, plasma melatonin concentrations at night increased from 65.4 +/- 9.6 pg/ml at 21:30h to 138.2 +/- 28.6 pg/ml at 24:00h. The pulsatile LH secretion was changed from the type of "high frequency, low amplitude" in the morning to the type of "low frequency, high amplitude" at night. Nocturnal FSH concentrations were lower than diurnal ones, but nocturnal prolactin concentrations were higher than diurnal ones. Nocturnal concentrations of melatonin were suppressed 40 min. after the light exposure (from 117....Continue Reading

Citations

May 21, 2014·Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft·A Ahamed BashaK Ramesh Rao
Oct 13, 2010·Gynecological Endocrinology : the Official Journal of the International Society of Gynecological Endocrinology·Konstantin V DanilenkoEvgeniy G Verevkin
Sep 1, 1996·Applied Human Science : Journal of Physiological Anthropology·T Morita, H Tokura

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