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dc.contributor.authorJago, R.en
dc.contributor.authorSolomon-Moore, E.en
dc.contributor.authorMacdonald-Wallis, C.en
dc.contributor.authorSebire, S.en
dc.contributor.authorThompson, J.en
dc.contributor.authorLawlor, D.en
dc.identifier.citationInternational Journal of Behavioral Nutrition and Physical Activity, 2017; 14(1):33en
dc.description.abstractBackground: The aim of this study was to examine how children’s and parents’ physical activity changes from Year 1 (5–6) to Year 4 (8–9 years of age). Methods: Data are from the Bristol (UK) B-PROACT1V cohort. Fifty-seven primary schools were recruited when the children were in Year 1, with 1299 children and their parents providing data. Forty-seven schools were re-recruited in Year 4, with 1223 children and parents providing data (685 of whom participated in Year 1). Children and at least one parent wore an accelerometer for 5 days including a weekend and mean minutes of sedentary time, moderate-to-vigorous intensity physical activity (MVPA) and accelerometer counts per minute (CPM) were derived. Multiple imputation was used to impute missing data for all 1837 families who took part, including those who participated at just one time. Paired t-tests examined if there was statistical evidence of change in accelerometer measures. Results: Multiple imputation and observed data were comparable and results using complete observed data were mostly the same as those using imputed data. Imputed data showed that mean boys’ CPM decreased from 747 to 673 (difference in mean 74 [95% CI 45 to 103]) and girls’ from 686 to 587 (99 [79 to 119]). Boys’ time spent in MVPA reduced from 72 to 69 (3 [0 to 6]) and girls’ from 62 to 56 (7 [4 to 9]) minutes per day. There were increases in sedentary time for both boys (354 to 428 min, 74 [61 to 88]) and girls (365 to 448, 83 [71 to 96]). There was no evidence of change in parent CPM or MVPA. Mothers’ sedentary time increased by 26 min per day [16 to 35]. Conclusions: There were similar increases in sedentary time in girls and boys between age 5–6 and 8–9, and decreases in MVPA that were more marked in girls. The similarity of multiple-imputed and complete observed data suggest that these findings may not be markedly affected by selection bias. Result support early interventions to prevent the age-related decline in children’s physical activity.en
dc.description.statementofresponsibilityRussell Jago, Emma Solomon-Moore, Corrie Macdonald-Wallis, Simon J. Sebire, Janice L. Thompson and Deborah A. Lawloren
dc.rights© The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.en
dc.subjectPhysical activity, children; cohort; longitudinalen
dc.titleChange in children's physical activity and sedentary time between Year 1 and Year 4 of primary school in the B-PROACT1V cohorten
dc.typeJournal articleen
pubs.library.collectionMedicine publicationsen
dc.identifier.orcidLawlor, D. [0000-0002-6793-2262]en
Appears in Collections:Medicine publications

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