Rowlands, AV and Cliff, DP and Fairclough, SJ and Boddy, LM and Olds, TS and Parfitt, G and Noonan, RJ and Downs, SJ and Knowles, ZR and Beets, MW (2016) Moving forward with backwards compatibility: Translating wrist accelerometer data. Medicine and Science in Sports and Exercise. ISSN 1530-0315
Rowlands et al_ENMO_MVPA_Final submitted.pdf - Accepted Version
Restricted to Repository staff only until 20 June 2017.
Purpose: To provide a means for calibrating raw acceleration data from wrist-worn accelerometers in relation to past estimates of children’s moderate-to-vigorous physical activity (MVPA) from a range of cut-points applied to hip-worn ActiGraph data.
Methods: This is a secondary analysis of three studies with concurrent 7-day accelerometer wear at the wrist (GENEActiv) and hip (ActiGraph) in 238 children aged 9-12 years. The time spent above acceleration (ENMO) thresholds of 100, 150, 200, 250, 300, 350 and 400 mg from wrist acceleration data (<5 s epoch) was calculated for comparison to MVPA estimated from widely used children’s hip-worn ActiGraph MVPA cut-points (Freedson/Trost 1100 counts per minute (cpm); Pate 1680 cpm; Evenson 2296 cpm; Puyau 3200 cpm) with epochs of <5, 15 and 60 s.
Results: The optimal ENMO thresholds for alignment with MVPA estimates from ActiGraph cut-points determined from 70% of the sample and cross-validated with the remaining 30% were: Freedson/Trost = ENMO 150+ mg, irrespective of ActiGraph epoch (ICC>0.65); Pate = ENMO 200+ mg, irrespective of ActiGraph epoch (ICC>0.67); Evenson = ENMO 250+ mg for <5 s and 15 s epochs (ICC>0.69) and ENMO 300+ mg for 60 s epochs (ICC=0.73); Puyau = ENMO 300+ mg for <5 s epochs (ICC=0.73), ENMO 350+ mg for 15 s epochs (ICC=0.73), ENMO 400+ mg for 60 s epochs (ICC=0.65). Agreement was robust with cross-validation ICCs=0.62-0.71 and means within ?7.8?±4.9% of MVPA estimates from ActiGraph cut-points, except Puyau 60 s epochs (ICC=0.42).
Conclusion: Incremental ENMO thresholds enable children’s acceleration data measured at the wrist to be simply and directly compared, at a group level, to past estimates of MVPA from hip-worn ActiGraphs across a range of cut-points.
|Additional Information:||'This is a non-final version of an article published in final form in Medicine and Science in Sports and Exercise. (C) 2016 American College of Sports Medicine|
|Uncontrolled Keywords:||1106 Human Movement And Sports Science|
|Subjects:||R Medicine > RC Internal medicine > RC1200 Sports Medicine|
|Divisions:||Sport & Exercise Sciences|
|Publisher:||American College of Sports Medicine (ACSM)|
|Date Deposited:||10 Jun 2016 08:51|
|Last Modified:||23 Sep 2016 11:26|
|DOI or Identification number:||10.1249/MSS.0000000000001015|
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