Validating the sedentary sphere method in children : does wrist or accelerometer brand matter?

Hurter, L, Rowlands, AV, Fairclough, SJ, Gibbon, KC, Knowles, ZR ORCID:, Porcellato, LA ORCID:, Cooper-Ryan, AM ORCID: and Boddy, LM 2019, 'Validating the sedentary sphere method in children : does wrist or accelerometer brand matter?' , Journal of Sports Sciences, 37 (16) , pp. 1910-1918.

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This study aimed to validate the Sedentary Sphere posture classification method from wrist-worn accelerometers in children. Twenty-seven 9–10-year-old children wore ActiGraph GT9X (AG) and GENEActiv (GA) accelerometers on both wrists, and activPAL on the thigh while completing prescribed activities: five sedentary activities, standing with a phone, walking (criterion for all 7: observation) and 10-min free-living play (criterion: activPAL). In an independent sample, 21 children wore AG and GA accelerometers on the non-dominant wrist and activPAL for two days of free-living. Per cent accuracy, pairwise 95% equivalence tests (±10% equivalence zone) and intra-class correlation coefficients (ICC) analyses were completed. Accuracy was similar, for prescribed activities irrespective of brand (non-dominant wrist: 77–78%; dominant wrist: 79%). Posture estimates were equivalent between wrists within brand (±6%, ICC > 0.81, lower 95% CI ≥ 0.75), between brands worn on the same wrist (±5%, ICC ≥ 0.84, lower 95% CI ≥ 0.80) and between brands worn on opposing wrists (±6%, ICC ≥ 0.78, lower 95% CI ≥ 0.72). Agreement with activPAL during free-living was 77%, but sedentary time was underestimated by 7% (GA) and 10% (AG). The Sedentary Sphere can be used to classify posture from wrist-worn AG and GA accelerometers for group-level estimates in children, but future work is needed to improve the algorithm for better individual-level results.

Item Type: Article
Schools: Schools > School of Health and Society > Centre for Health Sciences Research
Journal or Publication Title: Journal of Sports Sciences
Publisher: Taylor & Francis
ISSN: 0264-0414
Related URLs:
SWORD Depositor: Publications Router
Depositing User: Publications Router
Date Deposited: 02 May 2019 08:27
Last Modified: 28 Aug 2021 13:42

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