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Tracking of accelerometry-measured physical activity during childhood: ICAD pooled analysis..pdf (654.76 kB)

Tracking of accelerometry-measured physical activity during childhood: ICAD pooled analysis

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posted on 2015-11-17, 16:53 authored by Soyang Kwon, Kathleen F. Janz, Ashley R. Cooper, Ulf Ekelund, Dale EsligerDale Esliger, Pippa Griew, Ken Judge, Andy Ness, Christopher J. Riddoch, Jo Salmon, Lauren SherarLauren Sherar
Background: Understanding of physical activity (PA) tracking during childhood is important to predict PA behaviors and design appropriate interventions. We compared tracking of PA according to PA level and type of day (weekday/weekend) in a pool of five children's cohort studies.Methods: Data from ALSPAC, CLAN, Iowa Bone Development Study, HEAPS, PEACH were extracted from the International Children's Accelerometry Database (ICAD), resulting in 5,016 participants with age, gender, and accelerometry data at both baseline and follow-up (mean age: 10.3 years at baseline, 12.5 years at follow-up). Daily minutes spent in moderate- and vigorous-intensity PA (MVPA) and vigorous-intensity PA (VPA) was categorized into quintiles. Multinomial logistic regression models were fit to predict follow-up (M)VPA from baseline (M)VPA (reference: 20- < 80%tile), age at follow-up, and follow-up duration.Results: For the weekday, VPA tracking for boys with high baseline VPA was higher than boys with low baseline VPA (ORs: 3.9 [95% CI: 3.1, 5.0] vs. 2.1 [95% CI: 1.6, 2.6]). Among girls, high VPA was less stable when compared low VPA (ORs: 1.8 [95% CI: 1.4, 2.2] vs. 2.6 [95% CI: 2.1, 3.2]). The pattern was similar for MVPA among girls (ORs: 1.6 [95% CI: 1.2, 2.0] vs. 2.8 [95% CI: 2.3, 3.6]). Overall, tracking was lower for the weekend.Conclusions: PA tracking was higher on the weekday than the weekend, and among inactive girls than active girls. The PA " routine" of weekdays should be used to help children establish healthy PA patterns. Supports for PA increase and maintenance of girls are needed. © 2012 Kwon and Janz; licensee BioMed Central Ltd.


The work of Dr. Janz was supported by National Institute of Health [R01- DE09551, R01-DE12101, and UL1RR024979]. The archiving of the data was funded through a National Prevention Research Initiative (http://www.mrc.ac. uk/Ourresearch/Resourceservices/NPRI/index. htm). The funding partners relevant to this award are: British Heart Foundation; Cancer Research UK; Department of Health; Diabetes UK; Economic and Social Research Council; Medical Research Council; Research and Development Office for the Northern Ireland Health and Social Services; Chief Scientist Office; Scottish Executive Health Department; The Stroke Association; Welsh Assembly Government and World Cancer Research Fund.



  • Sport, Exercise and Health Sciences

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International Journal of Behavioral Nutrition and Physical Activity




KWON, S. ... et al, 2012. Tracking of accelerometry-measured physical activity during childhood: ICAD pooled analysis. International Journal of Behavioral Nutrition and Physical Activity, 9, 68.


BioMed Central Ltd / © Kwon and Janz


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This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.




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