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Improvement in Fatigue, Sleepiness, and Health-Related Quality of Life with Bright Light Treatment in Persons with Seasonal Affective Disorder and Subsyndromal SAD
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience. Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Medicinska och farmaceutiska vetenskapsområdet, centrumbildningar mm , Center for Clinical Research Dalarna.
Sleep Lab, Inland hospital, 2500 Tynset, Norway.
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
2011 (English)In: Depression Research and Treatment, ISSN 2090-1321, 543906- p.Article in journal (Refereed) Published
Abstract [en]

Objective. To investigate the effects of bright light treatment for secondary outcome measures and to explore and validate empirically derived subgroups and treatment effects in subgroups. Methods. A descriptive design. A sample of forty-nine persons (mean age of 45.8) with clinically assessed seasonal affective disorder (SAD) or  subsyndromal SAD (S-SAD) participated in a two-group clinical trial evaluating the effects of treatment with bright light therapy. A person-oriented cluster analysis was applied to study treatment effects in subgroups. Results. For the merged group, sleepiness (Epworth Sleepiness Scale), fatigue (fatigue questionnaire), and health-related quality of life (SF-36) were improved at posttreatment, and results were maintained at the one-month followup. Three distinct subgroups had a high level of fatigue in common, while the level of excessive daytime sleepiness and depressed mood differed between the subgroups. Over time, all subgroups improved following ten days treatment in a light room. Conclusion. Fatigue, excessive daytime sleepiness, and health-related quality of life improve in a similar way as depressed mood following treatment with bright light. The treatment was effective irrespective of the severity of the disorder, that is, for persons with SAD and  subsyndromal SAD.

Place, publisher, year, edition, pages
2011. 543906- p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-155288DOI: 10.1155/2011/543906OAI: oai:DiVA.org:uu-155288DiVA: diva2:425076
Available from: 2011-06-20 Created: 2011-06-20 Last updated: 2011-06-20Bibliographically approved

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Lindberg, Per
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Department of NeuroscienceCenter for Clinical Research DalarnaDepartment of Psychology
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