title: Between- and within-day variability in physical activity and inactivity in 9- and 15-year-old European children.
abstract: To examine differences in levels of physical activity (PA), time spent at moderate-to-vigorous intensity PA (MVPA) and time spent sedentary between and within days in children from four European countries, 1954 9 - and 15-year-olds were included. PA was measured during 2 weekdays and 2 weekend days using the manufacturing technology-incorporated (MTI) accelerometer. Average count per minute, time spent sedentary, time spent at MVPA and the proportion of children accumulating > or =60 min of MVPA were calculated. Data were compared between weekdays and weekend days and between school time and leisure-time. Although not entirely consistent across countries, overall PA, time spent sedentary and the proportion of children accumulating > or =60 min of MVPA were higher during weekdays compared with weekend days. Differences in overall PA between school time and leisure-time were highly inconsistent between countries. Few children (4-31%) accumulated > or =60 min of MVPA either during school time or during leisure-time. Differences in activity patterns between weekdays and weekend days are explained by less accumulated time in MVPA during weekend days. Weekend days and leisure-time during weekdays seem appropriate targets when promoting PA in order to increase the proportion of children achieving current recommendations on health-enhancing PA.
authors.affiliation: School of Health and Medical Sciences, Orebro University, Orebro, Sweden. andreas.nilsson@hi.oru.se
authors.forename: A
authors.initials: A
authors.lastname: Nilsson
authors.forename: S A
authors.initials: SA
authors.lastname: Anderssen
authors.forename: L B
authors.initials: LB
authors.lastname: Andersen
authors.forename: K
authors.initials: K
authors.lastname: Froberg
authors.forename: C
authors.initials: C
authors.lastname: Riddoch
authors.forename: L B
authors.initials: LB
authors.lastname: Sardinha
authors.forename: U
authors.initials: U
authors.lastname: Ekelund
mesh_terms: D000203:Activities of Daily Living; D000293:Adolescent; D000704:Analysis of Variance; D002648:Child; D003430:Cross-Sectional Studies; D005060:Europe; D005260:Female; D006801:Humans; D008297:Male; D008991:Monitoring, Physiologic / Q000295:instrumentation; D009043:Motor Activity / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D013997:Time Factors