Circadian phase response curves to light in older and young women and men |
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| Authors: | Daniel F Kripke Jeffrey A Elliott Shawn D Youngstedt Katharine M Rex |
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| Affiliation: | (1) Department of Psychiatry and Sam and Rose Stein Institute on Aging, University of California, San Diego #0667, La Jolla, California 92093-0667, USA;(2) Department of Exercise Science, Norman J. Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA;(3) Dorn VA Medical Center, Columbia, SC 29209, USA |
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| Abstract: | Background The phase of a circadian rhythm reflects where the peak and the trough occur, for example, the peak and trough of performance within the 24 h. Light exposure can shift this phase. More extensive knowledge of the human circadian phase response to light is needed to guide light treatment for shiftworkers, air travelers, and people with circadian rhythm phase disorders. This study tested the hypotheses that older adults have absent or weaker phase-shift responses to light (3000 lux), and that women's responses might differ from those of men. |
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