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Body movement and physical activity energy expenditure in children and adolescents: how to adjust for differences in body size and age
MRC Epidemiology Unit, Cambridge, United Kingdom; Department of Physical Education and Health, Örebro University, Örebro, Sweden; MRC Epidemiology Unit, Strangeways Research Laboratory, Worts Causeway, Cambridge, United Kingdom .
PREVNUT at Novum, Karolinska Institutet, Stockholm, Sweden .ORCID-id: 0000-0002-7165-279X
Department of Physical Education and Health, Örebro University, Örebro, Sweden; Institute of Sport Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark .
Department of Human Biology, Maastricht University, Maastricht, Netherlands .
Vise andre og tillknytning
2004 (engelsk)Inngår i: American Journal of Clinical Nutrition, ISSN 0002-9165, E-ISSN 1938-3207, Vol. 79, nr 5, s. 851-856Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

BACKGROUND: Physical activity data in children and adolescents who differ in body size and age are influenced by whether physical activity is expressed in terms of body movement or energy expenditure.

OBJECTIVE: We examined whether physical activity expressed as body movement (ie, accelerometer counts) differs from physical activity energy expenditure (PAEE) as a function of body size and age.

DESIGN: This was a cross-sectional study in children [n = 26; (+/-SD) age: 9.6 +/- 0.3 y] and adolescents (n = 25; age: 17.6 +/- 1.5 y) in which body movement and total energy expenditure (TEE) were simultaneously measured with the use of accelerometry and the doubly labeled water method, respectively. PAEE was expressed as 1) unadjusted PAEE [TEE minus resting energy expenditure (REE); in MJ/d], 2) PAEE adjusted for body weight (BW) (PAEE. kg(-1). d(-1)), 3) PAEE adjusted for fat-free mass (FFM) (PAEE. kg FFM(-1). d(-1)), and 4) the physical activity level (PAL = TEE/REE).

RESULTS: Body movement was significantly higher (P = 0.03) in children than in adolescents. Similarly, when PAEE was normalized for differences in BW or FFM, it was significantly higher in children than in adolescents (P = 0.03). In contrast, unadjusted PAEE and PAL were significantly higher in adolescents (P < 0.01).

CONCLUSIONS: PAEE should be normalized for BW or FFM for comparison of physical activity between children and adolescents who differ in body size and age. Adjusting PAEE for FFM removes the confounding effect of sex, and therefore FFM may be the most appropriate body-composition variable for normalization of PAEE. Unadjusted PAEE and PAL depend on body size.

sted, utgiver, år, opplag, sider
2004. Vol. 79, nr 5, s. 851-856
Emneord [en]
Accelerometry; Doubly labeled water; Physical activity energy expenditure; Physical activity level
HSV kategori
Forskningsprogram
Idrottsvetenskap
Identifikatorer
URN: urn:nbn:se:uu:diva-304878PubMedID: 15113725Scopus ID: 2-s2.0-2442424037OAI: oai:DiVA.org:uu-304878DiVA, id: diva2:1034387
Tilgjengelig fra: 2015-01-11 Laget: 2016-10-11 Sist oppdatert: 2017-11-29

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Ekelund, UlfYngve, Agneta
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