Picture map of Europe with pins indicating European capital cities

Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

Explore research outputs by the European Policies Research Centre...

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

van Loo, Christiana M.T. and Okely, Anthony D. and Batterham, Marijka J. and Hinkley, Trina and Ekelund, Ulf and Brage, Søren and Reilly, John J. and Jones, Rachel and 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. ISSN 1878-1861 (In Press)

[img]
Preview
Text (van-Loo-etal-JSMS2016-Validation-of-thigh-based-accelerometer-estimates)
van_Loo_etal_JSMS2016_Validation_of_thigh_based_accelerometer_estimates.pdf - Accepted Author Manuscript
License: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 logo

Download (611kB) | Preview

Abstract

Objectives: To validate activPAL3TM (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]: -13.8-11.1%) compared to 5-8y (12.6%, LoA: -39.8-14.7%). Underestimation for stepping time was small (5-8y: 6.5%, LoA: -18.3-5.3%; 9-12y: 7.6%, LoA: -16.8-1.6%). Considerable overestimation was found for standing (5-8y: 36.8%, LoA: -16.3-89.8%; 9-12y: 19.3%, LoA: -1.6-36.9%). 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.