title: Comparison Between Wrist-Worn and Waist-Worn Accelerometry.
abstract: To use the most recent ActiGraph model (GT9X) to compare counts per minute (CPM) estimates between wrist-worn and waist-worn attachment sites.
  
  
  
  Participants completed 2 conditions (laboratory [N = 13] and free-living conditions [N = 9]), in which during both of these conditions they wore 2 ActiGraph GT9X accelerometers on their nondominant wrist (side-by-side) and 2 ActiGraph GT9X accelerometers on their right hip in line with the midaxillary line (side-by-side). During the laboratory visit, participants completed 5 treadmill-based trials all lasting 5 min: walk at 3 mph, 3.5 mph, 4 mph, and a jog at 6 mph and 6.5 mph. During the free-living setting, participants wore the monitors for 8 hours. Paired t test, Pearson correlation and Bland-Altman analyses were employed to evaluate agreement of CPM between the attachment sites.
  
  
  
  Across all intensity levels and setting (laboratory and free-living), CPM were statistically significantly and substantively different between waist- and wrist-mounted accelerometry.
  
  
  
  Attachment site drastically influences CPM. As such, extreme caution should be exercised when comparing CPM estimates among studies employing different attachment site methodologies, particularly waist versus wrist.
authors.forename: Paul D
authors.initials: PD
authors.lastname: Loprinzi
authors.forename: Brandee
authors.initials: B
authors.lastname: Smith
mesh_terms: D061725:Accelerometry / Q000379:methods*; D000328:Adult; D015444:Exercise; D005260:Female; D006615:Hip / Q000502:physiology*; D006801:Humans; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D016138:Walking / Q000502:physiology*; D014953:Wrist / Q000502:physiology*; D055815:Young Adult
keywords: attachment methodology; exercise; physical activity