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BMC Psychiatry
Published in: BMC Psychiatry 1/2007

Open Access 01-12-2007 | Research article

Does bright light have an anxiolytic effect? - an open trial

Authors: Shawn D Youngstedt, Daniel F Kripke

Published in: BMC Psychiatry | Issue 1/2007

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Abstract

Background

The aim of this open trial was to examine the influence of acute bright light exposure on anxiety in older and young adults.

Methods

This study was ancillary to a complex 5-day laboratory experiment testing phase-responses to light at all times of the day. On 3 consecutive days, participants were exposed to bright light (3,000 lux) for 3 hours. The Spielberger State-Trait Anxiety Inventory (Form Y1) was administered 5 minutes before and 20 minutes after each treatment. Mean state anxiety before and after treatment were analyzed by age, sex, and time ANOVA. To avoid floor effects, only participants with baseline STAI levels of ≥ 25 were included.

Results

A significant anxiolytic effect of bright light was found for the mean data, as well as for each of the three days. No significant main effect of age, sex, or interaction of these factors with STAI change were found.

Conclusion

The results show consistent and significant (albeit modest) anxiolytic effects following acute bright light exposure in low anxiety adults. Further randomized, controlled trials in clinically anxious individuals are needed.
Appendix
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Metadata
Title
Does bright light have an anxiolytic effect? - an open trial
Authors
Shawn D Youngstedt
Daniel F Kripke
Publication date
01-12-2007
Publisher
BioMed Central
Published in
BMC Psychiatry / Issue 1/2007
Electronic ISSN: 1471-244X
DOI
https://doi.org/10.1186/1471-244X-7-62

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