Short-term effects of bright light therapy in adults with chronic nonspecific back pain: a randomized controlled trial.

Objective: The present trial evaluated incorporation of bright light therapy in the treatment of chronic nonspecific back pain (CNBP).

Design: A prospective, randomized, controlled, multicenter, open design with three parallel trial arms was used.

Setting: Subjects received a novel therapeutic, an expected therapeutic ineffective low dose, or no light exposure at three different medical centers.