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Between- and within-day variability in physical activity and inactivity in 9- and 15-year-old European children
Örebro University, School of Health and Medical Sciences. (RISPA)
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2009 (English)In: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 19, no 1, p. 10-18Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Oxford: Wiley-Blackwell, 2009. Vol. 19, no 1, p. 10-18
National Category
Social Sciences Interdisciplinary Sport and Fitness Sciences Medical and Health Sciences
Research subject
Sports Science; Biomedicine
Identifiers
URN: urn:nbn:se:oru:diva-2877DOI: 10.1111/j.1600-0838.2007.00762.xISI: 000262901500003PubMedID: 18248534Scopus ID: 2-s2.0-59149094073OAI: oai:DiVA.org:oru-2877DiVA, id: diva2:135395
Available from: 2008-01-17 Created: 2008-01-17 Last updated: 2018-01-13Bibliographically approved
In thesis
1. Physical activity assessed by accelerometry in children
Open this publication in new window or tab >>Physical activity assessed by accelerometry in children
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Physical activity (PA) is likely to constitute an important aspect of health-related behaviour in growing children. However, the knowledge on levels and patterns of PA in children is limited, due to the difficulty of precisely measuring this complex behaviour in normal daily living. Information on variables that significantly contributes to the variability in PA patterns is warranted as it may inform strategies for promoting physically active lifestyles in school-age youth. The overall purpose of the present studies was to increase the knowledge about the use of accelerometry when assessing PA in children, and examine sources of variability in objectively assessed PA behaviour in children. The study samples included 1954 nine- and 15-year-old children from four geographical locations in Europe (Norway, Denmark, Estonia and Portugal), and additionally 16 Swedish seven-year-old boys and girls. PA was assessed by the MTI accelerometer during free-living conditions, including both weekdays and weekend days. A part of the PA assessment was conducted using different time sampling intervals (epochs). Predictions of estimates of daily energy expenditure from accelerometer output were calculated using previously published equations. Potential correlates of PA behaviour were assessed by self-report. The main findings were; a) the epoch setting had a significant effect when interpreting time spent at higher intensities of PA in young children, b) predicted energy expenditure differed substantially between equations, c) between- and within-day differences in overall levels of PA, time spent at moderate-to-vigorous intensity physical activity and time spent sedentary differed between age, gender and geographical location, d) outdoor play and sports participation were differentially associated with objectively measured PA in 9- and 15-year-old children. It is concluded that the sporadic nature of children’s physical activity require very short epoch settings for detecting high intensity PA, and that different published equations for estimations of daily energy expenditure cannot be used interchangeably. The interpretations of average energy expenditure from available equations should be made with caution. Based on a large sample of children of different ages, 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. Further, significant correlates of PA behaviour dependent on age group are presented, which should be considered when planning interventions for promoting PA in school-age youth.

Place, publisher, year, edition, pages
Örebro: Örebro universitet, 2008. p. 84
Series
Örebro Studies in Medicine, ISSN 1652-4063 ; 12
Keywords
activity patterns, adolescents, health promotion, activity monitor, sedentary
National Category
Clinical Science
Research subject
Biomedicine
Identifiers
urn:nbn:se:oru:diva-1739 (URN)978-91-7668-570-9 (ISBN)
Public defence
2008-02-07, Hörsal G, G-huset, Örebro universitet, 13:00
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Supervisors
Available from: 2008-01-17 Created: 2008-01-09 Last updated: 2017-10-18Bibliographically approved

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Nilsson, AndreasEkelund, Ulf

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