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Multiple Sclerosis International
Volume 2014, Article ID 872732, 5 pages
http://dx.doi.org/10.1155/2014/872732
Research Article

Fatigue Is Associated with Poor Sleep in People with Multiple Sclerosis and Cognitive Impairment

1Department of Neurology, School of Medicine, Oregon Health & Science University, 3181 SW Sam Jackson Park Road L226, Portland, OR 97239, USA
2Multiple Sclerosis Center of Excellence-West, Portland Department of Veterans Affairs Medical Center, Portland, OR 97239, USA
3Portland Lung Clinic, Adventist Medical Center, Portland, OR 97216, USA
4Department of Medical Informatics and Clinical Epidemiology, School of Medicine, Oregon Health & Science University, Portland, OR 97239, USA
5Epilepsy Center of Excellence, Portland Veterans Affairs Medical Center, Portland, OR 97239, USA
6Department of Neurology, School of Medicine, Louisiana State University Health Sciences Center-New Orleans, New Orleans, LA 70112, USA
7National Center for Rehabilitative Auditory Research, Portland Veterans Affairs Medical Center, Portland, OR 97239, USA
8Department of Rehabilitation Medicine, University of Washington, VA Puget Sound Health Care System, VA MS Center of Excellence-West, Seattle, WA 98108, USA
9Department of Epidemiology, University of Washington, VA Puget Sound Health Care System, VA MS Center of Excellence-West, Seattle, WA 98108, USA

Received 8 August 2013; Revised 12 December 2013; Accepted 13 December 2013; Published 5 March 2014

Academic Editor: Francesca Bagnato

Copyright © 2014 Michelle H. Cameron et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background. Fatigue is the most common symptom in people with multiple sclerosis (MS). Poor sleep also occurs in this population. Objective. The objective of this study was to determine the relationship between fatigue and sleep quality in people with MS and cognitive impairment. Method. This cross-sectional study assessed relationships among fatigue, assessed with the Modified Fatigue Impact Scale (MFIS) and the Fatigue Severity Scale (FSS), sleep quality assessed with the Pittsburg Sleep Quality Index (PSQI), and demographics in 121 people with MS and cognitive impairment. Results. Fatigue was significantly correlated with poor sleep quality (MFIS: , ; FSS: , ). FSS scores were also significantly correlated with the PSQI subscore for daytime dysfunction and MFIS scores were significantly correlated with disability, age, and the PSQI subscores for sleep quality, sleep duration, and daytime dysfunction. Conclusions. This study demonstrates a relationship between fatigue and sleep quality in individuals with MS and cognitive impairment.