title: Sleep duration and central obesity in women - differences between short sleepers and long sleepers.
abstract: OBJECTIVE
  To assess characteristics of short sleepers and long sleepers and to assess association between sleep duration and central obesity in a population-based sample of women.
  
  
  METHODS
  Non-pregnant women ≥20 years that were randomly selected from the population-registry of Uppsala, Sweden, answered a questionnaire (n=6461) including questions on sleeping habits and somatic disorders.
  
  
  RESULTS
  There was a U-shaped association between sleep duration and waist circumference. Short sleeping women (<5 h) had a waist circumference of 89.2±14.9 cm (mean±SD) decreasing to 82.9±11.9 cm for women sleeping 7-<8 h and increasing to 89.0±16.7 cm for women sleeping ≥10 h. Both short sleepers and long sleepers were more often physically inactive, smokers, ill or taking medication, and psychologically distressed than normal sleepers (6-<9 h). In women <50 years both short and long sleep duration were risk factors for central obesity. Short sleep duration remained a risk factor for central obesity, whereas the association with long sleep duration did not reach statistical significance after adjustments.
  
  
  CONCLUSIONS
  Short sleepers and long sleepers showed differences in characteristics compared to normal sleepers. Furthermore, we showed an independent association between short sleep duration and central obesity, which was strongest in younger women. It is important to identify short sleepers, especially in younger women.
authors: Department of Medical Sciences, Respiratory Medicine and Allergology, Uppsala University, Sweden. jenny.theorell-haglow@medsci.uu.se
authors: Jenny
authors: J
authors: Theorell-Haglöw
authors: Lars
authors: L
authors: Berglund
authors: Christer
authors: C
authors: Janson
authors: Eva
authors: E
authors: Lindberg
mesh_terms: D000328:Adult; D017677:Age Distribution; D001007:Anxiety / Q000453:epidemiology; D015992:Body Mass Index; D003863:Depression / Q000453:epidemiology; D005260:Female; D006306:Health Surveys; D006801:Humans; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology / Q000503:physiopathology*; D012042:Registries / Q000706:statistics & numerical data*; D012307:Risk Factors; D012890:Sleep / Q000502:physiology*; D012893:Sleep Wake Disorders / Q000453:epidemiology / Q000503:physiopathology*; D011795:Surveys and Questionnaires; D013548:Sweden / Q000453:epidemiology; D055105:Waist Circumference; D055815:Young Adult