title: Describing the relationship between occupational and non-occupational physical activity using objective measurement.
abstract: OBJECTIVE
  Physical inactivity is a major health risk for working adults, yet the interplay between physical activity levels in work and non-work settings is not well understood. The association between occupational physical activity (OPA) and non-occupational physical activity (non-OPA), and associations by sex, were examined in a group of 233 working adults in the Minneapolis, MN metro area between 2010 and 2012.
  
  
  METHODS
  Accelerometry-measured activity was split into OPA and non-OPA via participant-reported typical work start and end times. Regression models were used to estimate associations.
  
  
  RESULTS
  Average weekly OPA was positively associated with non-OPA (B=0.18, 95% CI: 0.08-0.28) and associations were stronger among women than men (Binteraction= -0.39, 95% CI: -0.61 to -0.17).
  
  
  CONCLUSIONS
  Results suggest that individuals with less physical activity during work also have less physical activity outside of work. Understanding the complexities of the OPA/non-OPA relationship will enable researchers to explore the underlying mechanisms.
authors.affiliation: Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, 1300 S 2nd St, Minneapolis, MN 55415 ; HealthPartners Institute for Education and Research, 8170 33rd Ave S, Mailstop 21111R, PO Box 1524, Bloomington, MN 55440.
authors.forename: Meghan M
authors.initials: MM
authors.lastname: JaKa
authors.affiliation: Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, 1300 S 2nd St, Minneapolis, MN 55415.
authors.forename: Jacob L
authors.initials: JL
authors.lastname: Haapala
authors.affiliation: Division of Biostatistics, School of Public Health, University of Minnesota.
authors.forename: Julian
authors.initials: J
authors.lastname: Wolfson
authors.affiliation: Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, 1300 S 2nd St, Minneapolis, MN 55415.
authors.forename: Simone A
authors.initials: SA
authors.lastname: French
keywords: Bias (Epidemiology); Motor Activity; Occupational Health