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Brain Res. 1997 Jun 6;759(1):166-70.

Exposure to long summer days affects the human melatonin and cortisol rhythms.

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1
Institute of Physiology, Academy of Sciences of the Czech Republic, Prague.

Abstract

Exposure of 8 human subjects in summer to a natural 16 h bright light photoperiod phase advanced the morning salivary melatonin decline and cortisol rise and shortened the nocturnal melatonin signal by 2 h relative to the winter patterns of the same subjects followed under a combined artificial and natural light 16 h photoperiod. The data suggest that summer days experienced from sunrise till sunset and not winter days with a combined artificial and natural light long photoperiod evoke a true long day response of the human circadian system.

PMID:
9219878
[Indexed for MEDLINE]
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