title: Accelerometer measured daily physical activity and sedentary pursuits--comparison between two models of the Actigraph and the importance of data reduction.
abstract: BACKGROUND
  Very few validation studies have been performed between different generations of the commonly used Actigraph accelerometers. We compared daily physical activity data generated from the old generation Actigraph model 7164 with the new generation Actigraph GT1M accelerometer in 15 young females for eight consecutive days. We also investigated if different wear time thresholds had any impact on the findings. Minutes per day of moderate and vigorous physical activity (MVPA), vigorous physical activity (VPA) and very vigorous physical activity (VVPA) were calculated. Moreover, minutes of sedentary pursuits per day were calculated.
  
  
  RESULTS
  There were significant (P < 0.05) differences between the Actigraph 7164 and the GT1M concerning MVPA (61 ± 21vs. 56 ± 23 min/day), VPA (12 ± 8 vs. 9 ± 3 min/day) and VVPA (3.2 ± 3.0 vs. 0.3 ± 1.1 min/day). The different wear time thresholds had little impact on minutes per day in different intensities. Median minutes of sedentary pursuits per day ranged from 159 to 438 minutes depending on which wear time threshold was used (i.e. 10, 30 or 60 minutes), whereas very small differences were observed between the two different models.
  
  
  CONCLUSIONS
  Data from the old generation Actigraph 7164 and the new generation Actigraph GT1M accelerometers differ, where the Actigraph GT1M generates lower minutes spent in free living physical activity. Median minutes of sedentary pursuits per day are highly dependent on which wear time threshold that is used, and not by accelerometer model.
authors.forename: Tina
authors.initials: T
authors.lastname: Tanha
authors.forename: Åsa
authors.initials: Å
authors.lastname: Tornberg
authors.affiliation: Department of Clinical Sciences, Unit of Clinical Physiology and Nuclear Medicine, Skåne University Hospital, Lund University, Malmö, Sweden. magnus.dencker@skane.se.
authors.forename: Magnus
authors.initials: M
authors.lastname: Dencker
authors.forename: Per
authors.initials: P
authors.lastname: Wollmer
mesh_terms: D056044:Actigraphy / Q000295:instrumentation / Q000592:standards*; D000203:Activities of Daily Living; D000293:Adolescent; D000328:Adult; D003625:Data Collection / Q000592:standards; D005260:Female; D006801:Humans; D018670:Monitoring, Ambulatory / Q000295:instrumentation* / Q000379:methods; D009043:Motor Activity / Q000502:physiology*; D057185:Sedentary Behavior; D013997:Time Factors; D054928:Validation Studies as Topic