title: Abdominal obesity, TV-viewing time and prospective declines in physical activity.
abstract: OBJECTIVE
  To examine the prospective associations of baseline abdominal obesity and TV-viewing time with five-year reductions in leisure-time physical activity level.
  
  
  METHODS
  We used data from the Australian Diabetes, Obesity and Lifestyle Study (AusDiab), a nationally representative population-based cohort study with measures collected in 1999-2000 and 2004-2005. Abdominal obesity was determined by waist circumference and TV-viewing time and physical activity level were assessed using established interviewer-administered questionnaires.
  
  
  RESULTS
  Among 2,191 men and 2,650 women aged ≥ 25years, odds ratios (ORs) of 5-year reductions from sufficient to insufficient or no physical activity, and from insufficient to no physical activity were estimated with logistic regression. We adjusted for sociodemographic characteristics. The odds of reducing physical levels from baseline to the follow-up survey for obese men (34.2%) and women (38.1%), respectively were 1.40 (1.10-1.79) and 1.44 (1.16-1.80), compared to those with a normal waist circumference. Women, but not men, with higher levels of TV-viewing time had higher odds of reducing physical activity levels (8.6%; OR 1.46; 1.01-2.11), independent of abdominal obesity.
  
  
  CONCLUSIONS
  These findings suggest that abdominal obesity is associated with prospective reductions in physical activity level, and that high levels of TV-viewing time might have an additional adverse influence for women.
authors.affiliation: Department of General Practice, VU University Medical Center, van der Boechorststraat 7, Amsterdam, The Netherlands. j.lakerveld@vumc.nl
authors.forename: Jeroen
authors.initials: J
authors.lastname: Lakerveld
authors.forename: David
authors.initials: D
authors.lastname: Dunstan
authors.forename: Sandra
authors.initials: S
authors.lastname: Bot
authors.forename: Jo
authors.initials: J
authors.lastname: Salmon
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Dekker
authors.forename: Giel
authors.initials: G
authors.lastname: Nijpels
authors.forename: Neville
authors.initials: N
authors.lastname: Owen
mesh_terms: D000328:Adult; D000368:Aged; D001315:Australia; D015331:Cohort Studies; D015444:Exercise / Q000502:physiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D056128:Obesity, Abdominal / Q000503:physiopathology*; D011446:Prospective Studies; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires; D013690:Television; D013997:Time Factors; D055105:Waist Circumference / Q000502:physiology*