The treatment period lasted three months, after which the participants entered a naturalistic follow‐up period of six months. Participants were treated at home with 30 minutes of light therapy at fixed times in the morning and evening. The intervention group was treated with BLT (☑0,000 Lux), the control group with control light (☒00 Lux). Methods: In this double‐blind controlled trial, patients with idiopathic PD and MDD were randomized to the intervention or control group. BLT supports the circadian rhythm and might therefore be a new treatment option for MDD and insomnia in PD. Background: A disturbed circadian rhythm may be a causal factor in the development of MDD and insomnia in PD patients. Objective: The aim of this study was to assess the efficacy of Bright Light Therapy (BLT) in reducing depressive symptoms in patients with Parkinson's disease (PD) and major depressive disorder (MDD), compared with exposure to a control light. van der Werf, YD van den Heuvel, OAĪnatomy and neurosciences Psychiatry APH - Mental Health Amsterdam Neuroscience - Neurodegeneration Pediatric surgery Neurology Amsterdam Neuroscience - Mood, Anxiety, Psychosis, Stress & Sleep APH - Methodology ACS - Atherosclerosis & ischemic syndromes CCA - Imaging and biomarkers Epidemiology and Data Science Amsterdam Neuroscience - Compulsivity, Impulsivity & Attention The Effects of Bright Light Therapy on Depression, Sleep and Circadian Rhythm in Patients with Parkinson's Disease and a Depressive Disorder: Results of a Double-Blind Randomized Controlled Trial
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