title: Physical activity assessment methods in the Jackson Heart Study.
abstract: OBJECTIVE
  Physical activity measures used in exam 1 of the Jackson Heart Study (JHS), including the diet and physical activity substudy (DPASS), are described.
  
  
  METHODS
  The JHS physical activity (PAC) survey instrument was administered by interview. Accelerometer data, pedometer step counts, and additional questionnaire data were collected from volunteer subsamples of the cohort, including the DPASS.
  
  
  METHODS
  The PAC assessed four different domains of physical activity (active living, work, home and garden, and sport and exercise indexes). The 24-hour accelerometer and pedometer monitoring provided objective measures for validation of cohort survey responses. The DPASS past week activity (PWA) questionnaire assessed time spent in moderate and vigorous activity during the previous seven days. Pedometer step counts for three days before three DPASS visits provided additional data for the DPASS.
  
  
  RESULTS
  5296 respondents completed the PAC, 423 completed 24-hour accelerometer monitoring, and 499 completed the DPASS measures; 85 completed both 24-hour monitoring and DPASS measures. Initial analyses of leisure and sports activity items showed similar distributions for men and women and for the cohort and DPASS participants, in a bimodal distribution, with similar proportions reporting infrequent and frequent activity. The physical activity measures from the JHS can provide unique information about the association between physical activity, other risk factors, and cardiovascular disease in African Americans.
authors.affiliation: GV (Sonny) Montgomery Veterans Affairs Medical Center, Jackson, Mississippi 39216, USA. patricia.dubbert@med.va.gov
authors.forename: Patricia M
authors.initials: PM
authors.lastname: Dubbert
authors.forename: Teresa
authors.initials: T
authors.lastname: Carithers
authors.forename: Barbara E
authors.initials: BE
authors.lastname: Ainsworth
authors.forename: Herman A
authors.initials: HA
authors.lastname: Taylor
authors.forename: Gregory
authors.initials: G
authors.lastname: Wilson
authors.forename: Sharon B
authors.initials: SB
authors.lastname: Wyatt
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044383:Black People; D002318:Cardiovascular Diseases / Q000453:epidemiology / Q000208:ethnology*; D004032:Diet; D005260:Female; D006801:Humans; D007407:Interviews as Topic; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D008922:Mississippi / Q000453:epidemiology; D009043:Motor Activity; D011446:Prospective Studies; D012107:Research Design; D012111:Residence Characteristics; D011795:Surveys and Questionnaires; D001741:Black or African American