title: Reliability and validity of CHAMPS self-reported sedentary-to-vigorous intensity physical activity in older adults.
abstract: BACKGROUND
  Recent research highlights the potential value of differentiating between categories of physical activity intensities as predictors of health and well-being. This study sought to assess reliability and concurrent validity of sedentary (ie, 1 METs), low-light (ie, >1 and ≤2 METs; eg, playing cards), high-light (ie, >2 and <3 METs; eg, light walking), moderate-to-vigorous physical activity (MVPA, ≥3 METs), and "total activity" (≥2 METs) from the CHAMPS survey. Further, this study explored over-reporting and double-reporting.
  
  
  METHODS
  CHAMPS data were gathered from the Seniors Neighborhood Quality of Life Study, an observational study of adults aged 65+ years conducted in 2 US regions.
  
  
  RESULTS
  Participants (N = 870) were 75.3 ± 6.8 years old, with 56% women and 71% white. The CHAMPS sedentary, low-light, high-light, total activity, and MVPA variables had acceptable test-retest reliability (ICCs 0.56-0.70). The CHAMPS high-light (ρ = 0.27), total activity (ρ = 0.34), and MVPA (ρ = 0.37) duration scales were moderately associated with accelerometry minutes of corresponding intensity, and the sedentary scale (ρ = 0.12) had a lower, but significant correlation. Results suggested that several CHAMPS items may be susceptible to over-reporting (eg, walking, housework).
  
  
  CONCLUSIONS
  CHAMPS items effectively measured high-light, total activity, and MVPA in seniors, but further refinement is needed for sedentary and low-light activity.
authors.affiliation: Stanford Prevention Research Center, Stanford University, Stanford, CA, USA.
authors.forename: Eric B
authors.initials: EB
authors.lastname: Hekler
authors.forename: Matthew P
authors.initials: MP
authors.lastname: Buman
authors.forename: William L
authors.initials: WL
authors.lastname: Haskell
authors.forename: Terry L
authors.initials: TL
authors.lastname: Conway
authors.forename: Kelli L
authors.initials: KL
authors.lastname: Cain
authors.forename: James F
authors.initials: JF
authors.lastname: Sallis
authors.forename: Brian E
authors.initials: BE
authors.lastname: Saelens
authors.forename: Lawrence D
authors.initials: LD
authors.lastname: Frank
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Kerr
authors.forename: Abby C
authors.initials: AC
authors.lastname: King
mesh_terms: D000054:Acceleration; D056044:Actigraphy; D000367:Age Factors; D000368:Aged; D015444:Exercise / Q000502:physiology* / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D011788:Quality of Life / Q000523:psychology*; D015203:Reproducibility of Results; D057185:Sedentary Behavior; D057566:Self Report; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires