Short-Wavelength Light Enhances Cortisol Awakening Response in Sleep-Restricted Adolescents
Joint Authors
Figueiro, Mariana G.
Rea, Mark S.
Source
International Journal of Endocrinology
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-07-30
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Abstract EN
Levels of cortisol, a hormone produced by the adrenal gland, follow a daily, 24-hour rhythm with concentrations reaching a minimum in the evening and a peak near rising time.
In addition, cortisol levels exhibit a sharp peak in concentration within the first hour after waking; this is known as the cortisol awakening response (CAR).
The present study is a secondary analysis of a larger study investigating the impact of short-wavelength (λmax≈470 nm) light on CAR in adolescents who were sleep restricted.
The study ran over the course of three overnight sessions, at least one week apart.
The experimental sessions differed in terms of the light exposure scenarios experienced during the evening prior to sleeping in the laboratory and during the morning after waking from a 4.5-hour sleep opportunity.
Eighteen adolescents aged 12–17 years were exposed to dim light or to 40 lux (0.401 W/m2) of 470-nm peaking light for 80 minutes after awakening.
Saliva samples were collected every 20 minutes to assess CAR.
Exposure to short-wavelength light in the morning significantly enhanced CAR compared to dim light.
Morning exposure to short-wavelength light may be a simple, yet practical way to better prepare adolescents for an active day.
American Psychological Association (APA)
Figueiro, Mariana G.& Rea, Mark S.. 2012. Short-Wavelength Light Enhances Cortisol Awakening Response in Sleep-Restricted Adolescents. International Journal of Endocrinology،Vol. 2012, no. 2012, pp.1-7.
https://search.emarefa.net/detail/BIM-461640
Modern Language Association (MLA)
Figueiro, Mariana G.& Rea, Mark S.. Short-Wavelength Light Enhances Cortisol Awakening Response in Sleep-Restricted Adolescents. International Journal of Endocrinology No. 2012 (2012), pp.1-7.
https://search.emarefa.net/detail/BIM-461640
American Medical Association (AMA)
Figueiro, Mariana G.& Rea, Mark S.. Short-Wavelength Light Enhances Cortisol Awakening Response in Sleep-Restricted Adolescents. International Journal of Endocrinology. 2012. Vol. 2012, no. 2012, pp.1-7.
https://search.emarefa.net/detail/BIM-461640
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-461640