title: Predictive Validity of a Thigh-Worn Accelerometer METs Algorithm in 5- to 12-Year-old Children.
abstract: To validate the activPAL3 algorithm for predicting metabolic equivalents (TAMETs) and classifying MVPA in 5- to 12-year-old children.
  
  
  
  Fifty-seven children (9.2 ± 2.3y, 49.1% boys) completed 14 activities including sedentary behaviors (SB), light (LPA) and moderate-to-vigorous physical activities (MVPA). Indirect calorimetry (IC) was used as the criterion measure. Analyses included equivalence testing, Bland-Altman procedures and area under the receiver operating curve (ROC-AUC).
  
  
  
  At the group level, TAMETs were significantly equivalent to IC for handheld e-game, writing/coloring, and standing class activity (P < .05). Overall, TAMETs were overestimated for SB (7.9 ± 6.7%) and LPA (1.9 ± 20.2%) and underestimated for MVPA (27.7 ± 26.6%); however, classification accuracy of MVPA was good (ROC-AUC = 0.86). Limits of agreement were wide for all activities, indicating large individual error (SB: -27.6% to 44.7%; LPA: -47.1% to 51.0%; MVPA: -88.8% to 33.9%).
  
  
  
  TAMETs were accurate for some SB and standing, but were overestimated for overall SB and LPA, and underestimated for MVPA. Accuracy for classifying MVPA was, however, acceptable.
authors.affiliation: Early Start Research Institute and the Illawarra Health and Medical Research Institute, Faculty of Social Sciences, Wollongong, NSW, Australia.
authors.forename: Christiana M
authors.initials: CM
authors.lastname: van Loo
authors.forename: Anthony D
authors.initials: AD
authors.lastname: Okely
authors.forename: Marijka
authors.initials: M
authors.lastname: Batterham
authors.forename: Tina
authors.initials: T
authors.lastname: Hinkley
authors.forename: Ulf
authors.initials: U
authors.lastname: Ekelund
authors.forename: Soren
authors.initials: S
authors.lastname: Brage
authors.forename: John J
authors.initials: JJ
authors.lastname: Reilly
authors.forename: Gregory E
authors.initials: GE
authors.lastname: Peoples
authors.forename: Rachel
authors.initials: R
authors.lastname: Jones
authors.forename: Xanne
authors.initials: X
authors.lastname: Janssen
authors.forename: Dylan P
authors.initials: DP
authors.lastname: Cliff
mesh_terms: D061725:Accelerometry / Q000379:methods*; D002648:Child; D002675:Child, Preschool; D004734:Energy Metabolism / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity; D015203:Reproducibility of Results; D013848:Thigh