title: Characterization of wrist-wearable activity measurement using whole body calorimetry in semi-free living conditions.
abstract: Physical activity (PA) is a significant factor in a number of health conditions and monitoring PA can play a significant role in the treatment of, or research into, these conditions. For longitudinal monitoring of PA, unobtrusive devices are often used and there is a need for the development of energy expenditure (EE) estimation techniques from single-device systems. This paper presents an experiment designed to characterize the relationship between a previously described technique, the activity score (AS) and EE obtained from whole-room indirect calorimetry. The study used 8 participants over a 24-hr period with interspersed exercise periods to observe physical movement with wearable devices and EE in 5 minute epochs. Results show that AS and EE are correlated with a Spearman's rank correlation coefficient of 0.775 with p <; 0.001.
authors.forename: James D
authors.initials: JD
authors.lastname: Amor
authors.forename: John G
authors.initials: JG
authors.lastname: Hattersley
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Barber
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: James
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D002153:Calorimetry, Indirect / Q000295:instrumentation* / Q000379:methods; D002149:Energy Intake; D004734:Energy Metabolism; D015444:Exercise; D005260:Female; D006801:Humans; D057187:Independent Living; D008297:Male; D018670:Monitoring, Ambulatory; D009068:Movement; D010101:Oxygen Consumption; D018709:Statistics, Nonparametric; D014953:Wrist / Q000502:physiology; D055815:Young Adult