title: An investigation of a novel three-dimensional activity monitor to predict free-living energy expenditure.
abstract: The aim of this study was to assess the capability of the 3dNX accelerometer to predict energy expenditure in two separate, free-living cohorts. Twenty-three adolescents and 14 young adults took a single dose of doubly labelled water and wore a 3dNX activity monitor during waking hours for a 10-day period while carrying out their normal routines. Multiple linear regression with backward elimination was used to establish the strength of the associations between various indices of energy expenditure, physical activity counts, and anthropometric variables. 3dNX output accounted for 27% and 35% of the variance in the total energy expenditure of the adolescent and young adult cohort, respectively. The explained variance increased to 78%, with a standard error of estimate of 7%, when 3dNX output was combined with body composition variables. The 3dNX accelerometer can be used to predict free-living daily energy expenditure with a standard error of estimate of 1.65 MJ in adolescents and 1.52 MJ in young adults. The inclusion of anthropometric variables reduces the error to approximately 1 MJ. Although it remains to cross-validate these models in other populations, early indications suggest that the 3dNX provides a useful method of predicting energy expenditure in free-living individuals.
authors.affiliation: Optimal Performance Ltd., Bristol, UK. james@optimalperformance.co.uk
authors.forename: James
authors.initials: J
authors.lastname: Carter
authors.forename: David
authors.initials: D
authors.lastname: Wilkinson
authors.forename: Sam
authors.initials: S
authors.lastname: Blacker
authors.forename: Mark
authors.initials: M
authors.lastname: Rayson
authors.forename: James
authors.initials: J
authors.lastname: Bilzon
authors.forename: Rachel
authors.initials: R
authors.lastname: Izard
authors.forename: Andy
authors.initials: A
authors.lastname: Coward
authors.forename: Antony
authors.initials: A
authors.lastname: Wright
authors.forename: Alan
authors.initials: A
authors.lastname: Nevill
authors.forename: Kirsten
authors.initials: K
authors.lastname: Rennie
authors.forename: Tracey
authors.initials: T
authors.lastname: McCaffrey
authors.forename: Barbara
authors.initials: B
authors.lastname: Livingstone
mesh_terms: D000293:Adolescent; D000328:Adult; D015415:Biomarkers / Q000652:urine; D001823:Body Composition / Q000502:physiology; D015331:Cohort Studies; D003903:Deuterium / Q000378:metabolism / Q000652:urine; D004734:Energy Metabolism / Q000502:physiology*; D015444:Exercise / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D018670:Monitoring, Ambulatory / Q000295:instrumentation* / Q000379:methods*; D010101:Oxygen Consumption
chemical_list: D015415:Biomarkers; D003903:Deuterium