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Validation of thigh-based accelerometer estimates of postural allocation in 5-12 year-olds

van Loo, Christiana M T, Okely, Anthony D, Batterham, Marijka J, Hinkley, Trina, Ekelund, Ulf, Brage, Soren, Reilly, John J, Jones, Rachel A, Janssen, Xanne and Cliff, Dylan P 2016, Validation of thigh-based accelerometer estimates of postural allocation in 5-12 year-olds, Journal of science and medicine in sport, In Press, pp. 1-5, doi: 10.1016/j.jsams.2016.08.008.

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Title Validation of thigh-based accelerometer estimates of postural allocation in 5-12 year-olds
Author(s) van Loo, Christiana M T
Okely, Anthony D
Batterham, Marijka J
Hinkley, Trina
Ekelund, Ulf
Brage, Soren
Reilly, John J
Jones, Rachel A
Janssen, Xanne
Cliff, Dylan P
Journal name Journal of science and medicine in sport
Season In Press
Start page 1
End page 5
Total pages 5
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016
ISSN 1878-1861
Keyword(s) Accelerometry
Physical activity
Sedentary behaviour
Summary OBJECTIVES: To validate activPAL3™ (AP3) for classifying postural allocation, estimating time spent in postures and examining the number of breaks in sedentary behaviour (SB) in 5-12 year-olds. DESIGN: Laboratory-based validation study. METHODS: Fifty-seven children completed 15 sedentary, light- and moderate-to-vigorous intensity activities. Direct observation (DO) was used as the criterion measure. The accuracy of AP3 was examined using a confusion matrix, equivalence testing, Bland-Altman procedures and a paired t-test for 5-8y and 9-12y. RESULTS: Sensitivity of AP3 was 86.8%, 82.5% and 85.3% for sitting/lying, standing, and stepping, respectively, in 5-8y and 95.3%, 81.5% and 85.1%, respectively, in 9-12y. Time estimates of AP3 were equivalent to DO for sitting/lying in 9-12y and stepping in all ages, but not for sitting/lying in 5-12y and standing in all ages. Underestimation of sitting/lying time was smaller in 9-12y (1.4%, limits of agreement [LoA]: -13.8 to 11.1%) compared to 5-8y (12.6%, LoA: -39.8 to 14.7%). Underestimation for stepping time was small (5-8y: 6.5%, LoA: -18.3 to 5.3%; 9-12y: 7.6%, LoA: -16.8 to 1.6%). Considerable overestimation was found for standing (5-8y: 36.8%, LoA: -16.3 to 89.8%; 9-12y: 19.3%, LoA: -1.6 to 36.9%). SB breaks were significantly overestimated (5-8y: 53.2%, 9-12y: 28.3%, p<0.001). CONCLUSIONS: AP3 showed acceptable accuracy for classifying postures, however estimates of time spent standing were consistently overestimated and individual error was considerable. Estimates of sitting/lying were more accurate for 9-12y. Stepping time was accurately estimated for all ages. SB breaks were significantly overestimated, although the absolute difference was larger in 5-8y. Surveillance applications of AP3 would be acceptable, however, individual level applications might be less accurate.
Language eng
DOI 10.1016/j.jsams.2016.08.008
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
111799 Public Health and Health Services not elsewhere classified
Socio Economic Objective 920401 Behaviour and Health
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
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Created: Tue, 15 Nov 2016, 14:08:21 EST

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