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Int J Endocrinol. 2012;2012:749460. doi: 10.1155/2012/749460. Epub 2012 Oct 22.

Relationship of morning cortisol to circadian phase and rising time in young adults with delayed sleep times.

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Lighting Research Center, Rensselaer Polytechnic Institute, 21 Union Street, Troy, NY 12180-3352, USA.


The present study was aimed at further elucidating the relationship between circadian phase, rising time, and the morning cortisol awakening response (CAR). The results presented here are a secondary analysis of experimental data obtained from a study of advanced sleep-wake schedules and light exposures on circadian phase advances measured by dim-light melatonin onset (DLMO). The present results demonstrate that morning CAR is strongly related to rising time and more weakly related to DLMO phase.

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