title: Associations between short sleep duration and central obesity in women.
abstract: OBJECTIVE
  The aim was to assess associations between sleep duration, sleep stages, and central obesity in women.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  City of Uppsala, Sweden.
  
  
  METHODS
  Population-based sample of 400 women (range 20-70 years).
  
  
  METHODS
  Full-night polysomnography and measurement of anthropometric variables.
  
  
  RESULTS
  Sleep duration was inversely related to both waist circumference and sagittal abdominal diameter. Sleep duration remained inversely related to waist circumference (adj. beta = -1.22 cm/h; P = 0.016) and sagittal abdominal diameter (adj. beta = -0.46 cm/h; P = 0.001) after adjusting for potential confounders. Duration of slow wave sleep (SWS, adj. beta = -0.058 cm/min; P = 0.025) and REM sleep (adj. beta = -0.062 cm/min; P = 0.002) were both inversely related to waist circumference afteradjustments. Moreover,duration of REM sleep was inversely related to sagittal abdominal diameter (adj. beta = -0.021 cm/min; P < 0.0001). These associations were stronger in young women (age < 50 years).
  
  
  CONCLUSIONS
  An inverse relationship between short sleep duration and central obesity was found in women after adjusting for confounders. Loss of SWS and REM sleep may be important factors in the association between sleep loss and central obesity.
authors.affiliation: Department of Medical Sciences, Respiratory Medicine and Allergology, Uppsala University, Sweden. jenny.theorell-haglow@medsci.uu.se
authors.forename: Jenny
authors.initials: J
authors.lastname: Theorell-Haglöw
authors.forename: Christian
authors.initials: C
authors.lastname: Berne
authors.forename: Christer
authors.initials: C
authors.lastname: Janson
authors.forename: Carin
authors.initials: C
authors.lastname: Sahlin
authors.forename: Eva
authors.initials: E
authors.lastname: Lindberg
mesh_terms: D015992:Body Mass Index; D015897:Comorbidity; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008875:Middle Aged; D056128:Obesity, Abdominal / Q000453:epidemiology*; D017286:Polysomnography; D012307:Risk Factors; D012892:Sleep Deprivation / Q000453:epidemiology* / Q000503:physiopathology; D012894:Sleep Stages; D012895:Sleep, REM; D013548:Sweden / Q000453:epidemiology; D013997:Time Factors; D055105:Waist Circumference
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