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Longitudinal levels and bouts of objectively measured sedentary time among young Australian children in the HAPPY study

journal contribution
posted on 01.03.2016, 00:00 authored by V Carson, Jo SalmonJo Salmon, David CrawfordDavid Crawford, Trina Hinkley, Kylie HeskethKylie Hesketh
Objectives - To examine differences in sedentary time and bouts during and outside of childcare/school periods, and changes in sedentary time and bouts over 1-year among children who remained in childcare (childcare subsample) and among those who transitioned to school (school transition subsample).

Design - Longitudinal study.

Methods - Results are based on 177 children aged 3–5 years at baseline from the Healthy Active Preschool and Primary Years study in Melbourne, Australia. Sedentary time and sedentary bouts (1–4, 5–9, ≥10 min) for total days and during/outside of childcare/school on weekdays were accelerometer-derived at baseline (2008) and 1-year follow-up (2009), when 57% of participants had transitioned to school. Repeated-measures ANCOVAs adjusting for wear time were conducted.

Results - Compared to the outside of childcare/school period, children in the school transition subsample spent more time (0.5 min/day or 0.9% wear time) in ≥10 min sedentary bouts at baseline, participated in 26 more min/day of sedentary time at follow-up, and all participants spent less time (2–16 min/day or 2–3% of wear time) in 5–9 min sedentary bouts at baseline and follow-up during the childcare/school period (P < 0.05). Increases in sedentary time (34–54 min/day or 2–3% wear time) and time spent in 1–4 min sedentary bouts (18–29 min/day or 1–2% of wear time) were observed from baseline to follow-up in both the total sample and school transition sub-sample, for total days and during the childcare/school period (P < 0.05).

Conclusions - School transition was marked by increased sedentary time. School practices, policies, and environments to reduce sedentary time should be explored.



Journal of science and medicine in sport






232 - 236




Amsterdam, The Netherlands







Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2016, Elsevier