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Sleep and Breathing

, Volume 16, Issue 3, pp 639–648 | Cite as

Ten-year natural course of habitual snoring and restless legs syndrome in a population aged 61–63 years at the baseline

  • Anna-Kaisa JuutiEmail author
  • Liisa Hiltunen
  • Ulla Rajala
  • Mauri Laakso
  • Pirjo Härkönen
  • Sirkka Keinänen-Kiukaanniemi
  • Esa Läärä
Original Article

Abstract

Purpose

We investigated the prevalence, natural course, and associated risk factors of habitual snoring (HS) and restless legs syndrome (RLS) over a period of 10 years among an aging population from their early sixties to their seventies.

Methods

A population-based follow-up study among all persons born in 1935 and living in the city of Oulu in northern Finland was conducted. In this study, we examined subjects who had participated in two subsequent surveys conducted in 1996–1998 and 2007–2008. The data were gathered by questionnaires, as well as by laboratory and clinical measurements.

Results

Altogether 457 (55%) of the 838 eligible subjects participated in both surveys. The prevalence of both RLS and HS decreased during the 10 years from 21% to 15% and from 26% to 19%, respectively. Half of those who snored in 1996–1998 stopped snoring in 10 years time, and half of those who suffered from restless legs at least three times per week in 1996–1998 suffered from this syndrome never or less than once a week in 2007–2008. The 10-year incidence of new cases of both HS and RLS was 7%. Male gender predicted best the incidence of new HS in 10 years, while the Zung sum score as a marker of depressive symptoms and waist circumference predicted RLS.

Conclusions

Overall, the prevalence of both HS and RLS seems to diminish during aging. The causes behind this still remain unknown and should be investigated with more sophisticated methods.

Keywords

Habitual snoring Restless legs Depressive symptoms Waist circumference Male gender Longitudinal study 

Abbreviations

BNSQ

Basic Nordic Sleep Questionnaire

CHD

Coronary heart disease

ESS

Epworth Sleepiness Scale

HS

Habitual snoring

IFG

Impaired fasting glucose

IGR

Impaired glucose regulation

IGT

Impaired glucose tolerance

IRLSSG

International Restless Legs Syndrome Study Group

OGTT

2-h oral glucose tolerance test

RLS

Restless legs syndrome

ZSDS

Zung Self-rated Depression Scale

Notes

Conflicts of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Anna-Kaisa Juuti
    • 1
    Email author
  • Liisa Hiltunen
    • 2
    • 3
    • 4
  • Ulla Rajala
    • 1
  • Mauri Laakso
    • 1
    • 3
  • Pirjo Härkönen
    • 5
  • Sirkka Keinänen-Kiukaanniemi
    • 1
    • 3
    • 4
  • Esa Läärä
    • 6
  1. 1.Institute of Health SciencesUniversity of OuluOuluFinland
  2. 2.Vaasa Health Care DistrictVaasaFinland
  3. 3.Unit of General PracticeOulu University HospitalOuluFinland
  4. 4.Health Centre of OuluOuluFinland
  5. 5.Department of Sports MedicineOulu Deaconess InstituteOuluFinland
  6. 6.Department of Mathematical SciencesUniversity of OuluOuluFinland

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