title: The work and home activities questionnaire: energy expenditure estimates and association with percent body fat.
abstract: BACKGROUND
  Understanding and increasing physical activity requires assessment of occupational, home, leisure and sedentary activities.
  
  
  METHODS
  A physical activity questionnaire was developed using data from a large representative U.S. sample; includes occupational, leisure and home-based domains; and produces estimates of energy expenditure, percent body fat, minutes in various domains, and meeting recommendations. It was tested in 396 persons, mean age 44 years. Estimates were evaluated in relation to percent body fat measured by dual-energy x-ray absorptiometry.
  
  
  RESULTS
  Median energy expenditure was 2365 kcal (women) and 2960 kcal (men). Women spent 35.1 minutes/day in moderate household activities, 13.0 minutes in moderate leisure and 4.0 minutes in vigorous activities. Men spent 18.0, 22.5 and 15.6 minutes/day in those activities, respectively. Men and women spent 276.4 and 257.0 minutes/day in sedentary activities. Respondents who met recommendations through vigorous activities had significantly lower percent body fat than those who did not, while meeting recommendations only through moderate activities was not associated with percent body fat. Predicted and observed percent body fat correlated at r = .73 and r = .82 for men and women respectively, P < .0001.
  
  
  CONCLUSIONS
  This questionnaire may be useful for understanding health effects of different components of activity, and for interventions to increase activity levels.
authors.affiliation: School of Public Health, University of California, Berkeley, CA, USA.
authors.forename: Gladys
authors.initials: G
authors.lastname: Block
authors.forename: Christopher D
authors.initials: CD
authors.lastname: Jensen
authors.forename: Torin J
authors.initials: TJ
authors.lastname: Block
authors.forename: Jean
authors.initials: J
authors.lastname: Norris
authors.forename: Tapashi B
authors.initials: TB
authors.lastname: Dalvi
authors.forename: Ellen B
authors.initials: EB
authors.lastname: Fung
mesh_terms: D015502:Absorptiometry, Photon; D050154:Adiposity; D000293:Adolescent; D000328:Adult; D000368:Aged; D004734:Energy Metabolism; D005260:Female; D006306:Health Surveys; D040361:Healthy People Programs; D006801:Humans; D007899:Leisure Activities; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009790:Occupations; D012044:Regression Analysis; D011795:Surveys and Questionnaires; D014481:United States / Q000453:epidemiology