title: A Comparison of Accelerometer Cut-Points among Individuals with Coronary Artery Disease.
abstract: BACKGROUND
  Accurate assessment of physical activity among coronary artery disease patients is important for assessing adherence to interventions. The study compared moderate-to-vigorous physical intensity activity and relationships with cardiometabolic health/fitness indicators using accelerometer cut-points developed for coronary artery disease patients versus those developed in younger and middle-aged adults.
  
  
  METHODS
  A total of 231 adults with coronary artery disease wore an Actigraph GT3X accelerometer for ≥4 days (≥10 hours/day). Moderate-to-vigorous intensity physical activity between cut-points was compared using Bland-Altman analyses. Partial spearman correlations assessed relationships between moderate-to-vigorous intensity physical activity from each cut-point with markers of cardiometabolic health and fitness while controlling for age and sex.
  
  
  RESULTS
  Average time spent in bouts of moderate-to-vigorous intensity physical activity using coronary artery disease cut-points was significantly higher than the young (mean difference: 13.0±12.8 minutes/day) or middle-aged (17.0±15.2 minutes/day) cut-points. Young and middle-aged cut-points were more strongly correlated with body mass index, waist circumference and systolic blood pressure, while coronary artery disease cut-points had stronger relationships with triglycerides, high-density and low-density lipoproteins. All were similarly correlated with measures of fitness.
  
  
  CONCLUSIONS
  Researchers need to exert caution when deciding on which cut-points to apply to their population. Further work is needed to validate which cut-points provide a true reflection of moderate-to-vigorous intensity physical activity and to examine relationships among patients with varying fitness.
authors.affiliation: Division of Prevention and Rehabilitation, University of Ottawa Heart Institute, Ottawa, Ontario, Canada.
authors.forename: Stephanie A
authors.initials: SA
authors.lastname: Prince
authors.affiliation: Division of Prevention and Rehabilitation, University of Ottawa Heart Institute, Ottawa, Ontario, Canada.
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Reed
authors.affiliation: Institute for Clinical Evaluation Services, Ottawa, Ontario, Canada.
authors.forename: Amy E
authors.initials: AE
authors.lastname: Mark
authors.affiliation: Department of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Blanchard
authors.affiliation: School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada; Toronto Rehabilitation Institute, University Health Network, Toronto, Ontario, Canada.
authors.forename: Sherry L
authors.initials: SL
authors.lastname: Grace
authors.affiliation: Division of Prevention and Rehabilitation, University of Ottawa Heart Institute, Ottawa, Ontario, Canada.
authors.forename: Robert D
authors.initials: RD
authors.lastname: Reid
mesh_terms: D056044:Actigraphy / Q000295:instrumentation / Q000379:methods; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers; D002170:Canada / Q000453:epidemiology; D003324:Coronary Artery Disease / Q000453:epidemiology / Q000378:metabolism* / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D012016:Reference Values; D012959:Socioeconomic Factors
chemical_list: D015415:Biomarkers