Body movement and physical activity energy expenditure in children and adolescents: how to adjust for differences in body size and age

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MARC

Ekelund, Ulf,1960-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 (author)

Body movement and physical activity energy expenditure in children and adolescents : how to adjust for differences in body size and age

Article/chapterEnglish2004

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Elsevier BV,2004
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LIBRIS-ID:oai:DiVA.org:uu-304878
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-304878URI
https://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-30475URI
https://doi.org/10.1093/ajcn/79.5.851DOI
http://kipublications.ki.se/Default.aspx?queryparsed=id:1958025URI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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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.

Subject headings and genre

MEDICIN OCH HÄLSOVETENSKAP Hälsovetenskap Idrottsvetenskap hsv//swe
MEDICAL AND HEALTH SCIENCES Health Sciences Sport and Fitness Sciences hsv//eng
Accelerometry; Doubly labeled water; Physical activity energy expenditure; Physical activity level
Sports Science
Idrottsvetenskap

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Yngve, Agneta,Professor,1953-Karolinska Institutet(Swepub:oru)aye (author)
Brage, SörenDepartment of Physical Education and Health, Örebro University, Örebro, Sweden; Institute of Sport Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark (author)
Westerterp, KlaasDepartment of Human Biology, Maastricht University, Maastricht, Netherlands (author)
Sjöström, MichaelKarolinska Institutet (author)
Karolinska InstitutetMRC 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 (creator_code:org_t)

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In:American Journal of Clinical Nutrition: Elsevier BV79:5, s. 851-8560002-91651938-3207

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