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Scandinavian Journal of Pain

Official Journal of the Scandinavian Association for the Study of Pain

Editor-in-Chief: Breivik, Harald

4 Issues per year


CiteScore 2017: 0.84

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1877-8879
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Volume 17, Issue 1

Perceived sleep deficit is a strong predictor of RLS in multisite pain – A population based study in middle aged females

Romana Stehlik
  • Corresponding author
  • Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
  • Center for Sleep and Vigilance Disorders, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Jan Ulfberg / Ding Zou
  • Center for Sleep and Vigilance Disorders, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Jan Hedner
  • Center for Sleep and Vigilance Disorders, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
  • Sleep Disorders Center, Sahlgrenska University Hospital, Gothenburg, Sweden
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ludger Grote
  • Center for Sleep and Vigilance Disorders, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
  • Sleep Disorders Center, Sahlgrenska University Hospital, Gothenburg, Sweden
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2017-10-01 | DOI: https://doi.org/10.1016/j.sjpain.2017.06.003

Abstract

Background

Chronic pain conditions as well as Restless Legs Syndrome (RLS) are known to be associated with subjectively and objectively disturbed sleep. RLS has been recently described as highly prevalent in multisite pain and the role of sleep as a modifying factor in this RLS phenotype is unknown. This study aimed to investigate if perceived sleep deficit and other sleep related parameters predict RLS in subjects with multisite pain.

Current knowledge/study rationale

We have recently demonstrated a strong association between Restless Legs Syndrome (RLS) and number of pain locations. In the current analysis we hypothesized that impaired sleep predicts RLS in subjects with multisite pain.

Method

Questionnaire-based data from 2727 randomly selected women aged 18-64 years were used to analyze RLS symptoms, self-reported sleep quality, and the degree of daytime sleepiness (Epworth Sleepiness Scale (ESS)) in relation to type, degree and localization of body pain. Potential confounders including anthropometrics, pain localization, co-morbidities, and medication were adjusted for in the Generalized Linear Models (GLM).

Results

Perceived sleep deficit ≥90 min (OR 2.4 (1.5-3.8), p < 0.001) and frequent nocturnal awakenings (OR 2.3 (1.4-3.6), p <0.001) were the strongest sleep related predictors for RLS in subjects with multisite pain. Additional factors include prolonged sleep latency (≥30 min, OR 1.8 (1.1-2.8), p = 0.01) and daytime symptoms like elevated daytime sleepiness (ESS score ≥9, OR 1.8 (1.2-2.7), p = 0.005). Accordingly, RLS diagnosis was associated with impaired sleep quality (TST (Total Sleep Time) -8.2 min, sleep latency +8.0 min, and number of awakenings from sleep +0.4, p <0.01). ESS score increased with RLS diagnosis (+0.74, p <0.01) and number of pain locations (0.5, 1.7, and 1.8 for 1, 3, and 5 pain areas, p <0.001). In addition, confounders like pain severity, the history of psychiatric disease, and current smoking were associated with impaired sleep quality in this group of females.

Conclusions

Perceived sleep deficit and sleep fragmentation are the strongest sleep related predictors of RLS in multisite pain. Potential implication of our results are that clinical management programmes of RLS in subjects with multisite pain need to consider both sleep quality and sleep quantity for individually tailored treatment regimes.

Study impact

RLS, pain, and sleep disorders are highly interrelated. Our study strongly suggests that clinical management of RLS in patients with multisite pain needs to consider sleep quality as an independent risk factor.

Keywords: Chronic widespread pain; Restless legs syndrome; Sleep disorders; Female

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About the article

Pain Center, Uppsala University Hospital, 751 85 Uppsala, Sweden


Received: 2017-01-05

Revised: 2017-06-02

Accepted: 2017-06-11

Published Online: 2017-10-01

Published in Print: 2017-10-01


Funding sources: Grants for Romana Stehlik: Centre for Clinical Research (CKF), in Dalarna, Sweden: 2010: D18000; 2012: D12000. Swedish Sleep Research Society: 2012: D3500. Grants used for posting of the questionnaires to the population and for data management. Pain Rehabilitation Clinic, Sater, Sweden: 2011: D10000; 2012: D 20000;2013: D 5000. This amount was used for part-time salaries for personnel performing and evaluating the study. There are no other sources of funding.

Conflicts of interest: The authors have no conflict of interest.


Citation Information: Scandinavian Journal of Pain, Volume 17, Issue 1, Pages 1–7, ISSN (Online) 1877-8879, ISSN (Print) 1877-8860, DOI: https://doi.org/10.1016/j.sjpain.2017.06.003.

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