Rat Serum Melatonin Rise and Fall: Influence of Morning Light. (Reannouncementwith New Availability Information)

摘要

Illnerova and Vanecek (1-6) adapted rats to various lengths of dark (scotoperiod)with novel light pulses or novel dark extension. The rise and fall of melatonin (MEL) synthesis were each entrainable in the dark without an influence of acute inhibition by light gating the surge into dark. Evening light phase-delayed and morning light phase-advanced the MEL rise and fall. Variable and opposite influences on the rise and fall timings and a variable interaction between them depended on scotoperoid length. Usually, the advancing effect of morning light determined the MEL fall. In shorter scotoperiods, evening light had a delaying effect on the MEL rise.