Establishing raw acceleration thresholds to classify sedentary and stationary behaviour in children

Hurter, Liezel, Fairclough, Stuart, Knowles, Zoe, Porcellato, Lorna, Cooper-Ryan, Anna and Boddy, Lynner (2018) Establishing raw acceleration thresholds to classify sedentary and stationary behaviour in children. Children, 5 (12). pp. 1-18. ISSN 2227-9067 DOI

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This study aimed to: (1) compare acceleration output between ActiGraph (AG) hip and wrist monitors and GENEActiv (GA) wrist monitors; (2) identify raw acceleration sedentary and stationary thresholds for the two brands and placements; and (3) validate the thresholds during a free-living period. Twenty-seven from 9- to 10-year-old children wore AG accelerometers on the right hip, dominant- and non-dominant wrists, GA accelerometers on both wrists, and an activPAL on the thigh, while completing seven sedentary and light-intensity physical activities, followed by 10 minutes of school recess. In a subsequent study, 21 children wore AG and GA wrist monitors and activPAL for two days of free-living. The main effects of activity and brand and a significant activity × brand × placement interaction were observed (all p < 0.0001). Output from the AG hip was lower than the AG wrist monitors (both p < 0.0001). Receiver operating characteristic (ROC) curves established AG sedentary thresholds of 32.6 mg for the hip, 55.6 mg and 48.1 mg for dominant and non-dominant wrists respectively. GA wrist thresholds were 56.5 mg (dominant) and 51.6 mg (non-dominant). Similar thresholds were observed for stationary behaviours. The AG non-dominant threshold came closest to achieving equivalency with activPAL during free-living.

Item Type: Article
Uncontrolled Keywords: accelerometers; wearable technology; activity classification; cut points
Subjects: L Education > L Education (General)
R Medicine > R Medicine (General)
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sports Science
Date Deposited: 21 Dec 2018 10:35

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