Morningness and eveningness: the free cortisol rise after awakening in "early birds" and "night owls".
Identifieur interne : 001436 ( Main/Exploration ); précédent : 001435; suivant : 001437Morningness and eveningness: the free cortisol rise after awakening in "early birds" and "night owls".
Auteurs : Brigitte M. Kudielka [Allemagne] ; Ilona S. Federenko ; Dirk H. Hellhammer ; Stefan WüstSource :
- Biological psychology [ 0301-0511 ] ; 2006.
English descriptors
- KwdEn :
- MESH :
- chemical , analysis : Hydrocortisone.
- chemistry : Saliva.
- physiology : Circadian Rhythm, Hypothalamo-Hypophyseal System, Pituitary-Adrenal System, Twins, Wakefulness.
- Adult, Humans, Male, Surveys and Questionnaires.
Abstract
We investigated salivary cortisol profiles in the first hour after awakening in morning versus evening chronotypes. Chronotypes were defined by Horne and Ostberg's Owl-and-Lark-Questionnaire. In a sample of 112 healthy, day-active young men, we identified 9 morning and 29 evening chronotypes. Saliva samples were collected 0, 30, 45, and 60min after awakening on 2 consecutive days. Log-transformed cortisol levels were analyzed with General Linear Model procedures (GLMs) and awakening time and sleep duration were entered as covariates. On both days, a significant main effect of chronotype emerged (both p=0.02), and this effect could not be explained by differences in awakening time or sleep duration. The present data support the idea that morning relative to evening chronotypes might show higher cortisol levels in the first hour after awakening. In sum, individual chronotype should be acknowledged as one further possible source of interindividual variability in the cortisol rise after awakening.
DOI: 10.1016/j.biopsycho.2005.08.003
PubMed: 16236420
Affiliations:
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Kudielka</name><affiliation wicri:level="4"><nlm:affiliation>Department of Clinical and Theoretical Psychobiology, University of Trier, Johanniterufer 15, D-54290 Trier, Germany. kudielka@uni-trier.de</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Department of Clinical and Theoretical Psychobiology, University of Trier, Johanniterufer 15, D-54290 Trier</wicri:regionArea><wicri:noRegion>54290 Trier</wicri:noRegion><orgName type="university">Université de Trèves</orgName><placeName><settlement type="city">Trèves (Allemagne)</settlement><region type="land" nuts="1">Rhénanie-Palatinat</region></placeName></affiliation></author><author><name sortKey="Federenko, Ilona S" sort="Federenko, Ilona S" uniqKey="Federenko I" first="Ilona S" last="Federenko">Ilona S. Federenko</name></author><author><name sortKey="Hellhammer, Dirk H" sort="Hellhammer, Dirk H" uniqKey="Hellhammer D" first="Dirk H" last="Hellhammer">Dirk H. 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Chronotypes were defined by Horne and Ostberg's Owl-and-Lark-Questionnaire. In a sample of 112 healthy, day-active young men, we identified 9 morning and 29 evening chronotypes. Saliva samples were collected 0, 30, 45, and 60min after awakening on 2 consecutive days. Log-transformed cortisol levels were analyzed with General Linear Model procedures (GLMs) and awakening time and sleep duration were entered as covariates. On both days, a significant main effect of chronotype emerged (both p=0.02), and this effect could not be explained by differences in awakening time or sleep duration. The present data support the idea that morning relative to evening chronotypes might show higher cortisol levels in the first hour after awakening. In sum, individual chronotype should be acknowledged as one further possible source of interindividual variability in the cortisol rise after awakening.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country><region><li>Rhénanie-Palatinat</li></region><settlement><li>Trèves (Allemagne)</li></settlement><orgName><li>Université de Trèves</li></orgName></list><tree><noCountry><name sortKey="Federenko, Ilona S" sort="Federenko, Ilona S" uniqKey="Federenko I" first="Ilona S" last="Federenko">Ilona S. Federenko</name><name sortKey="Hellhammer, Dirk H" sort="Hellhammer, Dirk H" uniqKey="Hellhammer D" first="Dirk H" last="Hellhammer">Dirk H. Hellhammer</name><name sortKey="Wust, Stefan" sort="Wust, Stefan" uniqKey="Wust S" first="Stefan" last="Wüst">Stefan Wüst</name></noCountry><country name="Allemagne"><region name="Rhénanie-Palatinat"><name sortKey="Kudielka, Brigitte M" sort="Kudielka, Brigitte M" uniqKey="Kudielka B" first="Brigitte M" last="Kudielka">Brigitte M. 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