Boddy, LM, Noonan, RJ, Rowlands, AV, Hurter, L, Knowles, ZR and Fairclough, SJ (2019) The backwards comparability of wrist worn GENEActiv and waist worn ActiGraph accelerometer estimates of sedentary time in children. Journal of Science and Medicine in Sport. ISSN 1440-2440

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Abstract

Objectives: To examine the backward comparability of a range of wrist-worn accelerometer estimates of sedentary time (ST) with ActiGraph 100 count∙min-1 waist ST estimates.

Design: Cross-sectional, secondary data analysis
Method: One hundred and eight 10-11-year-old children (65 girls) wore an ActiGraph GT3X+ accelerometer (AG) on their waist and a GENEActiv accelerometer (GA) on their non-dominant wrist for seven days. GA ST data were classified using a range of thresholds from 23-56 mg. ST estimates were compared to AG ST 100 count∙min-1 data. Agreement between the AG and GA thresholds was examined using Cronbach’s alpha, intraclass correlation coefficients (ICC), limits of agreement (LOA), Kappa values, percent agreement, mean absolute percent error (MAPE) and equivalency analysis.

Results: Mean AG total ST was 492.4 minutes over the measurement period. Kappa values ranged from 0.31-0.39. Percent agreement ranged from 68-69.9%. Cronbach’s alpha values ranged from 0.88-0.93. ICCs ranged from 0.59-0.86. LOA were wide for all comparisons. Only the 34 mg threshold produced estimates that were equivalent at the group level to the AG ST 100 count∙min-1 data though sensitivity and specificity values of ~64% and ~74% respectively were observed.

Conclusions: Wrist-based estimates of ST generated using the 34 mg threshold are comparable with those derived from the AG waist mounted 100 count∙min-1 threshold at the group level. The 34 mg threshold could be applied to allow group-level comparisons of ST with evidence generated using the ActiGraph 100 count∙min-1 method though it is important to consider the observed sensitivity and specificity results when interpreting findings.

Item Type:	Article
Uncontrolled Keywords:	1106 Human Movement and Sports Sciences, 1117 Public Health and Health Services
Subjects:	R Medicine > RC Internal medicine > RC1200 Sports Medicine R Medicine > RJ Pediatrics > RJ101 Child Health. Child health services
Divisions:	Sport & Exercise Sciences
Publisher:	Elsevier
Date Deposited:	05 Feb 2019 10:11
Last Modified:	04 Sep 2021 09:44
DOI or ID number:	10.1016/j.jsams.2019.02.001
URI:	https://researchonline.ljmu.ac.uk/id/eprint/10111

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