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Author (up) Thorn, L.; Hucklebridge, F.; Esgate, A.; Evans, P.; Clow, A. url  doi
  Title The effect of dawn simulation on the cortisol response to awakening in healthy participants Type Journal Article
  Year 2004 Publication Psychoneuroendocrinology Abbreviated Journal Psychoneuroendocrinology  
  Volume 29 Issue 7 Pages 925-930  
  Keywords Human Health; Adult; Affect/*physiology/radiation effects; Arousal/*physiology/radiation effects; Circadian Rhythm/*physiology; Female; Humans; Hydrocortisone/analysis/*physiology/radiation effects; *Light; Male; Middle Aged; Reference Values; Saliva/chemistry; Wakefulness/*physiology/radiation effects  
  Abstract Bright light exposure after awakening has been shown to elevate cortisol levels in healthy participants. The present study examined the effect of dawn simulation (a treatment for seasonal affective disorder) on the cortisol response to awakening and mood. Twelve healthy participants were supplied with a dawn simulator (The Natural Alarm Clock, Outside In, Cambridge Ltd), a bedside light that increases in intensity prior to awakening to approximately 250 lux over 30 mins when an audible alarm sounds. A counterbalanced study was performed on 4 consecutive normal weekdays, two of which were control days (no dawn simulation) and two experimental (dawn simulation). Saliva samples were taken immediately on awakening then at 15, 30 and 45 minutes post awakening on all 4 study-days. Total cortisol production during the first 45 mins after awakening was found to be significantly higher in the experimental condition than in the control condition. Participants also reported greater arousal in the experimental condition and there was a trend for an association between increased arousal and increased cortisol secretory activity under dawn simulation. This study provides supportive evidence for the role of light and the suprachiasmatic nucleus in the awakening cortisol response.  
  Address Department of Psychology, University of Westminster, 309 Regent Street, London W1R 8AL, UK  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0306-4530 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:15177708 Approved no  
  Call Number LoNNe @ kagoburian @ Serial 824  
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