title: Age and temporal trends of total physical activity in Swedish men.
abstract: OBJECTIVE
  Despite a large public health interest in physical activity and its role in obesity and other chronic diseases, only few reports to date have addressed total levels and trends of physical activity. We have studied in a cross-sectional setting with a retrospective recall of physical activity an association of levels of total physical activity and different types of activities with age and with calendar-time.
  
  
  METHODS
  In a population-based study of 33,466 men aged 45-79 yr in central Sweden, information on physical activity and other lifestyle factors was collected through a self-administered questionnaire. Level of total activity at ages 15, 30, and 50 yr was assessed quantitatively, based on six questions on different activities: work/occupation, housework, walking/bicycling, exercise, inactive leisure time, and sleeping. The physical activity levels were measured as metabolic equivalents, MET-hours per days.
  
  
  RESULTS
  Total daily physical activity decreased at age 30 yr (-1.6%, 95% CI: -1.7, -1.4) and at age 50 yr (-3.9%, 95% CI: -4.0, -3.7) compared with age 15 yr. Total physical activity decreased over a period of 60 yr in all three separate age groups (-9.1% among 15-yr-olds, 95% CI: -9.8, -8.5; -2.3% among 30-yr-olds 95% CI: -3.0, -1.6; and -2.9% among 50-yr-olds, 95% CI: -3.4, -2.5).
  
  
  CONCLUSIONS
  These negative trends in physical activity observed by age and with time might explain the trends in increasing prevalence of obesity.
authors.affiliation: The National Institute of Environmental Medicine, Division of Nutritional Epidemiology, Karolinska Institutet, Stockholm, Sweden.
authors.forename: Anna
authors.initials: A
authors.lastname: Norman
authors.forename: Rino
authors.initials: R
authors.lastname: Bellocco
authors.forename: Florin
authors.initials: F
authors.lastname: Vaida
authors.forename: Alicja
authors.initials: A
authors.lastname: Wolk
mesh_terms: D000367:Age Factors; D000368:Aged; D003430:Cross-Sectional Studies; D015444:Exercise; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology; D009790:Occupations; D010809:Physical Fitness; D011634:Public Health; D012189:Retrospective Studies; D013177:Sports; D013548:Sweden