Effect of morning bright light on body temperature, plasma cortisol and wrist motility measured during 24 hour of constant conditions.
Using 24 h constant conditions, time course of body temperature, plasma cortisol and wrist motility was measured in response to a 3 day morning 2 h bright light pulse. This protocol demonstrated that a 2000 lux illumination was sufficient to elicit a shift of about 2 h of temperature minimum and cortisol peak. In reference session, actimetric recordings showed a circadian time course, closely in relation with core temperature. Bright light pulse resulted in a decrease of amplitude and a disappearance of circadian pattern of actimetry.
Foret
J
J
Laboratoire d'Etude du Sommeil, INSERM U 296, Paris, France.
Aguirre
A
A
Touitou
Y
Y
Clodoré
M
M
Benoit
O
O
D000328:Adult; D001833:Body Temperature Regulation / Q000502:physiology*; D002940:Circadian Rhythm / Q000502:physiology / Q000528:radiation effects*; D006801:Humans; D006854:Hydrocortisone / Q000097:blood* / Q000378:metabolism; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D012890:Sleep / Q000502:physiology; D013472:Sunlight; D014953:Wrist
D006854:Hydrocortisone