title: Validation of Actigraph accelerometer estimates of total energy expenditure in young children.
abstract: OBJECTIVE
  To assess the validity of two equations based on the Actigraph CSA/MTI accelerometer for prediction of total energy expenditure (TEE).
  
  
  METHODS
  The criterion was TEE measured using the doubly labeled water method in 85 children, mean age 4.6 years (SD 1.1), over 7 days in the pre-schoolers and 10 days in the school-age participants. Children wore the Actigraph concurrently during waking hours, for 3 of 7 days (pre-schoolers) or 7 of 10 days (school-age children). We tested two prediction equations based on accelerometry. Agreement between predicted and measured TEE was assessed using the 'Bland Altman' approach.
  
  
  RESULTS
  Mean TEE measured by doubly-labeled water was 5.8 MJ/d (SD 1.6). Mean error for the Ekelund equation was + 0.3 MJ/d (limits of agreement -3.7 to + 4.3), and for that of Puyau et al. was -0.3 MJ/d (limits of agreement + 3.2 to -3.8).
  
  
  CONCLUSIONS
  Simple approaches using the Actigraph appear to be inadequate for the estimation of free-living TEE in young children at present.
authors: University of Glasgow, Division of Developmental Medicine, Yorkhill Hospitals, Glasgow, Scotland. jjr2y@clinmed.gla.ac.uk
authors: John J
authors: JJ
authors: Reilly
authors: Louise A
authors: LA
authors: Kelly
authors: Colette
authors: C
authors: Montgomery
authors: Diane M
authors: DM
authors: Jackson
authors: Christine
authors: C
authors: Slater
authors: Stan
authors: S
authors: Grant
authors: James Y
authors: JY
authors: Paton
mesh_terms: D000054:Acceleration; D015992:Body Mass Index; D002153:Calorimetry, Indirect / Q000379:methods; D002648:Child; D002675:Child, Preschool; D017666:Deuterium Oxide; D004734:Energy Metabolism / Q000502:physiology*; D005260:Female; D006801:Humans; D007553:Isotope Labeling; D008019:Life Style; D008137:Longitudinal Studies; D008297:Male; D018670:Monitoring, Ambulatory / Q000295:instrumentation* / Q000379:methods; D009043:Motor Activity / Q000502:physiology; D010103:Oxygen Isotopes; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012606:Scotland; D017678:Sex Distribution
chemical_list: D010103:Oxygen Isotopes; D017666:Deuterium Oxide