OBJECTIVE. To investigate the effects of bright light treatment on
the symptoms of pain, mood, and sleep in patients with
fibromyalgia (FM) reporting seasonality of symptoms on the
Seasonal Pattern Assessment Questionnaire (SPAQ).
randomized 10 week crossover study compared the effects of 4
weeks of "visible electromagnetic fields" (EMF) (light
condition; mean 4750 lux, SD 2337 lux) to 4 weeks of
"nonvisible EMF" (no light condition) in 14 patients with FM
having a minimum SPAQ score of 11. The light visor system
(Bio-Brite) was fitted with an opaque filter for the
"nonvisible EMF" control condition.
RESULTS. No significant
differences were found between treatment conditions on
tenderness measured with dolorimetry, self-ratings of sleep,
pain, mood, and global measures. Mood was not related to pain
or sleep. There was significant reduction in depression scores
and subjective pain, but increased tenderness and nocturnal
awakenings related to time.
CONCLUSION. The were no
significant differences between the light and no light
conditions on pain, mood, or sleep in patients with FM
reporting seasonality of symptoms. No relationship was found
between mood and the symptoms of FM (i.e., pain, sleep, and
MCM: Studied effects of bright light in 10-week crossover
study in 14 pts w FM and a score on the Seasonal Pattern
Assessment Questionnaire of at least 11. Found no difference
between treatment conditions and pain, sleep, or mood. No
relationship was found between mood and the symptoms of FM
(i.e., in pain, sleep, and fatigue).
Pearl SJ, Lue F, MacLean AW, Heslegrave RJ, Reynolds WJ, Moldofsky H