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Comparison of equations for predicting energy expenditure from accelerometer counts in children
Örebro University, School of Health and Medical Sciences. (RISPA)ORCID iD: 0000-0003-3793-335X
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2008 (English)In: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 18, no 5, p. 643-650Article in journal (Refereed) Published
Abstract [en]

Several prediction equations developed to convert body movement measured by accelerometry into energy expenditure have been published. The aim of this study was to examine the degree of agreement between three different prediction equations, when applied to data on physical activity in a large sample of children. We examined 1321 children (663 boys, 658 girls; mean age 9.6+/-0.4 years) from four different countries. Physical activity was measured by the MTI accelerometer. One equation, derived from doubly labeled water (DLW) measurements, was compared with one treadmill-based (TM) and one room calorimeter-based (CAL) equation (mixture of activities). Predicted physical activity energy expenditure (PAEE) was the main outcome variable. In comparison with DLW-predicted PAEE, both laboratory-derived equations significantly (P<0.001) overestimated PAEE by 17% and 83%, respectively, when based on a 24-h prediction, while the TM equation significantly (P<0.001) underestimated PAEE by 46%, when based on awake time only. In contrast, the CAL equation agreed better with the DLW equation under the awake time assumption. Predicted PAEE differ substantially between equations, depending on time-frame assumptions, and interpretations of average levels of PAEE in children from available equations should be made with caution. Further development of equations applicable to free-living scenarios is needed.

Place, publisher, year, edition, pages
Oxford: Blackwell , 2008. Vol. 18, no 5, p. 643-650
National Category
Medical and Health Sciences Social Sciences Interdisciplinary Sport and Fitness Sciences
Research subject
Sports Science
Identifiers
URN: urn:nbn:se:oru:diva-2876DOI: 10.1111/j.1600-0838.2007.00694.xOAI: oai:DiVA.org:oru-2876DiVA, id: diva2:135394
Available from: 2008-01-17 Created: 2008-01-17 Last updated: 2019-09-20Bibliographically 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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Available from: 2008-01-17 Created: 2008-01-09 Last updated: 2019-09-20Bibliographically approved

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Nilsson, AndreasEkelund, Ulf

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