Anxiety, Depression, Sleep
Conditions
Keywords
Anxiety, Phototherapy, Psychic Anxiety
Brief summary
The primary aim of this research was to examine the influence of bright light on anxiety in high-anxious young adults. In an acute exposure study, participants were randomly assigned to 45 min of either (1) bright light (3,000 lux) or (2) a placebo inactivated negative ion generator. Treatments were initiated ≤1 hr after awakening. At 10 min before and 30 min after the treatments, state anxiety, mood, and blood pressure were assessed. Following the acute exposure study, participants performed a 5-week study. Following a a 1-week baseline, participants were randomly assigned to four weeks of daily exposure to either (1) bright light (45 min/day; 3,000 lux) or (2) placebo inactivated negative ion generator, which were initiated ≤1 hr after awakening. Before and after the experiment, clinical ratings were conducted with the Hamilton Anxiety Scale, the Hamilton Depression Scale, and the Clinical Global Impressions scale (CGI). Following baseline, and following each week of treatment, blood pressure, as well as questionnaires for state anxiety, depression, mood, sleep, and side effects were assessed.
Interventions
DEVICELitebook Bright Light Box
Four weeks of daily exposure to bright light (3,000 lux) for 45 min/day, beginning within 60 min of arising.
DEVICELitebook inactivated negation ion generator (the placebo)
Four weeks of daily exposure to inactivated negative ion generator for 45 min/day, beginning within 60 min of arising
Sponsors
Liteboook Company
University of South Carolina
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to 35 Years
Healthy volunteers
Yes
Inclusion criteria
* Having a level of trait anxiety \[Spielberger State-Trait Anxiety Inventory (Form Y1)\]{23642} that was ≥ the 75th percentile for their age (i.e., ≥ 46 and ≥ 44 for women and men, respectively)
Exclusion criteria
* Current treatment for anxiety or depression; * History of bipolar disorder, mania, or psychotic disorders; * History of winter depression, which might bias towards positive response to light; * Hypertension; * Ophthalmic abnormalities; and * Usual exposure to high levels of light such that the intervention would add little to usual exposure.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Spielberger State Anxiety Inventory | 5 weeks | state anxiety questionnaire |
| Hamilton Anxiety | 5 weeks | Hamilton Anxiety Questionnaire |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Beck Depression Inventory | 5 weeks | self-report depression questionnaire |
| Pittsburgh Sleep Quality Inventory | 5 weeks | PSQI, a common sleep quality questionnaire |
Countries
United States
Outcome results
None listed