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Title: Moving Forward with Backward Compatibility: Translating Wrist Accelerometer Data
Authors: Rowlands, Alex V.
Cliff, Dylan P.
Fairclough, Stuart J.
Boddy, Lynne M.
Olds, Tim S.
Parfitt, Gaynor
Noonan, Rob J.
Downs, Samantha J.
Knowles, Zoe R.
Beets, Michael W.
First Published: 20-Jun-2016
Publisher: American College of Sports Medicine (ACSM)
Citation: Medicine and Science in Sports and Exercise, 2016, in press
Abstract: 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.
DOI Link: 10.1249/MSS.0000000000001015
ISSN: 0195-9131
eISSN: 1530-0315
Links: TBC
Embargo on file until: 20-Jun-2017
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2016 American College of Sports Medicine (ACSM). Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Description: The file associated with this record is under a 12 month embargo from publication in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.
Appears in Collections:Published Articles, College of Medicine, Biological Sciences and Psychology

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