Diurnal variations of hormonal secretion, alertness and cognition in extreme chronotypes under different lighting conditions.

ABSTRACT: Circadian rhythms in physiology and behavior are modulated by external factors such as light or temperature. We studied whether self-selected office lighting during the habitual waking period had a different impact on alertness, cognitive performance and hormonal secretion in extreme morning and evening chronotypes (N = 32), whose preferred bed- and wake-up times differed by several hours. The self-selected lighting condition was compared with constant bright light and a control condition in dim light. Saliva samples for hormonal analyses, subjective ratings of alertness, wellbeing, visual comfort and cognitive performance were regularly collected. Between the self-selected and the bright, but not the dim lighting condition, the onset of melatonin secretion in the evening (as marker for ci

SUBMITTER: Maierova L 

PROVIDER: S-EPMC5028769 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature