Circadian rhythmicity of cortisol and body temperature: morningness-eveningness effects.

@article{Bailey2001CircadianRO,
  title={Circadian rhythmicity of cortisol and body temperature: morningness-eveningness effects.},
  author={S. L. Bailey and Margaret McLean Heitkemper},
  journal={Chronobiology international},
  year={2001},
  volume={18 2},
  pages={249-61}
}
The purpose of this study was to describe and compare the circadian rhythm of body temperature and cortisol, as well as self-reported clock times of sleep onset and offset on weekdays and weekends in 19 healthy adult "larks" (morning chronotypes) and "owls" (evening chronotypes), defined by the Home and Ostberg questionnaire. Day-active subjects entered the General Clinical Research Center, where blood was sampled every 2 h over 38 h for later analysis for cortisol concentration by enzyme… CONTINUE READING