Melatonin Rhythms in Night Shift Workers

Circadian excretory rhythms in night workers.

Conroy, R. T. W. L., Elliott, A. L., and Mills, J. N. (1970). Brit. J. industr. Med., 27, 356-363. Circadian excretory rhythms in night workers. Urine samples have been collected from day and night shift workers in a light engineering factory over periods of 24 or 48 hours during which blood was also collected for determination of plasma 11-hydroxycorticosteroids (11-OHCS). Different subjects d...

Circadian rhythms in plasma concentration of 11-hydroxycorticosteroids in men working on night shift and in permanent night workers.

Association between night shift work, melatonin and estradiol in nurses

Synthesis of melatonin is regulated through visible light exposure, with peak production during the night. Melatonin regulates various physiological processes including secretion of other hormones, and has anticarcinogenic properties as demonstrated in animal and in vitro experiments. It has been suggested that night shift work (exposure to light at night) may disrupt circadian rhythm, and mela...

Increased and mistimed sex hormone production in night shift workers.

BACKGROUND Night shift work has been associated with an increased risk for breast and prostate cancer. The effect of circadian disruption on sex steroid production is a possible underlying mechanism, underinvestigated in humans. We have assessed daily rhythms of sex hormones and melatonin in night and day shift workers of both sexes. METHODS We recruited 75 night and 42 day workers, ages 22 t...

Circadian variation of melatonin, light exposure, and diurnal preference in day and night shift workers of both sexes.

BACKGROUND Light-at-night has been shown in experimental studies to disrupt melatonin production but this has only partly been confirmed in studies of night shift workers. In this cross-sectional study, we examined the circadian variation of melatonin in relation to shift status, individual levels of light-at-night exposure, and diurnal preference, an attribute reflecting personal preference fo...