title: Associations between bouted and non-bouted physical activity on multimorbidity.
abstract: BACKGROUND
  The association between objectively measured bouted (at least 10 min in duration) and non-bouted (<10 min in duration) physical activity with multimorbidity is unknown, which was the purpose of this study.
  
  
  METHODS
  Data from the 2003-2006 National Health and Nutrition Examination Survey (NHANES) were employed (n = 4 584 adults). Bouted physical activity and non-bouted physical activity were assessed via accelerometry, with multimorbidity assessed via physician diagnosis and laboratory data.
  
  
  RESULTS
  For the ordinal regression model, and after adjustment, both non-bouted moderate-to-vigorous physical activity (MVPA; βadjusted= -0·63; 95% CI: -0·79 to -0·48; P<0·001) and bouted MVPA (βadjusted= -0·43; 95% CI: -0·63 to -0·23; P<0·001) were independently associated with multimorbidity. In a multivariable logistic regression, both non-bouted MVPA (ORadjusted= 0·59; 95% CI: 0·48-0·72; P<0·001) and bouted MVPA (ORadjusted= 0·66; 95% CI: 0·52-0·84; P = 0·001) were associated with a reduced odds of being multimorbid.
  
  
  CONCLUSIONS
  Both bouted MVPA and non-bouted MVPA were associated with reduced odds of multimorbidity, underscoring the importance of promoting both types of physical activity.
authors.affiliation: Department of Health, Exercise Science and Recreation Management, Center for Health Behavior Research, The University of Mississippi, University, MS, USA.
authors.forename: Paul D
authors.initials: PD
authors.lastname: Loprinzi
mesh_terms: D000328:Adult; D015444:Exercise; D005260:Female; D006304:Health Status; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D000076322:Multimorbidity; D015999:Multivariate Analysis; D009749:Nutrition Surveys; D016017:Odds Ratio; D065840:Protective Factors; D012307:Risk Factors; D013997:Time Factors; D014481:United States
keywords: accelerometry; chronic disease; epidemiology; physical activity