Cross-sectional associations between occupational and leisure-time sitting, physical activity and obesity in working adults

Prev Med. Mar-Apr 2012;54(3-4):195-200. doi: 10.1016/j.ypmed.2011.12.020. Epub 2011 Dec 28.

Abstract

Aim: To examine associations between occupational and leisure-time sitting, physical activity and obesity in working adults.

Methods: We analyzed data from workers from the 2007-08 Australian National Health Survey (n=10,785). Participants reported their activity at work (mostly sitting, standing, walking, or heavy labor), transport-related walking, leisure-time sitting and physical activity. Body mass index was objectively measured. Adjusted Cox proportional hazard regression models examined associations between occupational activity category, leisure-time sitting, physical activity and obesity risk.

Results: Substantial proportions of men (42%) and women (47%) mostly sit at work. Workers with sitting jobs were significantly more likely to be sufficiently active during leisure-time than workers with mostly standing, walking or heavy labor jobs (RR=0.88, 0.80, 0.86 respectively). Workers with mostly sitting jobs had significantly higher overweight/obesity risk than workers with mostly standing jobs (RR=0.88, 95% CI: 0.82-0.95) independent of physical activity and leisure-time sitting. Workers with leisure-time sitting of less than four hours per day had significantly lower obesity risk than workers with four or more hours per day of leisure-time sitting (RR=0.77, 95%CI: 0.69-0.87) independent of physical activity and occupational activity.

Conclusions: Sitting time and physical activity are independently associated with obesity. Leisure-time sitting may have a stronger association with obesity risk than occupational sitting.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Age Factors
  • Aged
  • Australia / epidemiology
  • Body Mass Index
  • Cross-Sectional Studies
  • Female
  • Health Surveys
  • Humans
  • Leisure Activities*
  • Male
  • Middle Aged
  • Motor Activity*
  • Obesity / epidemiology
  • Obesity / etiology*
  • Occupations / statistics & numerical data*
  • Proportional Hazards Models
  • Risk
  • Risk Factors
  • Sedentary Behavior*
  • Sex Factors
  • Young Adult