title: Validation of five minimally obstructive methods to estimate physical activity energy expenditure in young adults in semi-standardized settings.
abstract: We compared the accuracy of five objective methods, including two newly developed methods combining accelerometry and activity type recognition (Acti4), against indirect calorimetry, to estimate total energy expenditure (EE) of different activities in semi-standardized settings. Fourteen participants performed a standardized and semi-standardized protocol including seven daily life activity types, while having their EE measured by indirect calorimetry. Simultaneously, physical activity was quantified by an ActivPAL3, two ActiGraph GT3X+'s and an Actiheart. EE was estimated by the standard ActivPAL3 software (ActivPAL), ActiGraph GT3X+ (ActiGraph) and Actiheart (Actiheart), and by a combination of activity type recognition via Acti4 software and activity counts per minute (CPM) of either a hip- or thigh-worn ActiGraph GT3X+ (AGhip + Acti4 and AGthigh + Acti4). At group level, estimated physical activities EE by Actiheart (MSE = 2.05) and AGthigh + Acti4 (MSE = 0.25) were not significantly different from measured EE by indirect calorimetry, while significantly underestimated by ActiGraph, ActivPAL and AGhip + Acti4. AGthigh + Acti4 and Actiheart explained 77% and 45%, of the individual variations in measured physical activity EE by indirect calorimetry, respectively. This study concludes that combining accelerometer data from a thigh-worn ActiGraph GT3X+ with activity type recognition improved the accuracy of activity specific EE estimation against indirect calorimetry in semi-standardized settings compared to previously validated methods using CPM only.
authors.affiliation: Department of Nutrition, Exercise and Sports, University of Copenhagen, DK-2200 Copenhagen, Denmark. ngu@nrcwe.dk.|National Research Centre for the Working Environment, DK-2100 Copenhagen, Denmark. ngu@nrcwe.dk.
authors.forename: Mikkel B
authors.initials: MB
authors.lastname: Schneller
authors.affiliation: Department of Nutrition, Exercise and Sports, University of Copenhagen, DK-2200 Copenhagen, Denmark. mtpedersen@nexs.ku.dk.
authors.forename: Mogens T
authors.initials: MT
authors.lastname: Pedersen
authors.affiliation: National Research Centre for the Working Environment, DK-2100 Copenhagen, Denmark. ngu@nrcwe.dk.
authors.forename: Nidhi
authors.initials: N
authors.lastname: Gupta
authors.affiliation: Research Centre for Prevention and Health, the Capital Region of Denmark, Glostrup University Hospital, DK-2600 Glostrup, Denmark. metaad01@regionh.dk.
authors.forename: Mette
authors.initials: M
authors.lastname: Aadahl
authors.affiliation: National Research Centre for the Working Environment, DK-2100 Copenhagen, Denmark. ngu@nrcwe.dk.
authors.forename: Andreas
authors.initials: A
authors.lastname: Holtermann
mesh_terms: D061725:Accelerometry; D000328:Adult; D002153:Calorimetry, Indirect; D004734:Energy Metabolism; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D018670:Monitoring, Ambulatory; D009043:Motor Activity / Q000502:physiology*; D010101:Oxygen Consumption; D013686:Telemetry; D016138:Walking / Q000502:physiology*; D055815:Young Adult