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    An investigation of a novel three-dimensional activity monitor to predict free-living energy expenditure.

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    Authors
    Carter, James
    Wilkinson, David
    Blacker, Sam
    Rayson, Mark
    Bilzon, James
    Izard, Rachel
    Coward, Andy
    Wright, Antony
    Nevill, Alan M.
    Rennie, Kirsten
    McCaffrey, Tracey
    Livingstone, Barbara
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    Issue Date
    2008
    
    Metadata
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    Abstract
    The aim of this study was to assess the capability of the 3dNXTM accelerometer to predict energy expenditure in two separate, free-living cohorts. Twenty-three adolescents and 14 young adults took a single dose of doubly labelled water and wore a 3dNXTM activity monitor during waking hours for a 10-day period while carrying out their normal routines. Multiple linear regression with backward elimination was used to establish the strength of the associations between various indices of energy expenditure, physical activity counts, and anthropometric variables. 3dNXTM output accounted for 27% and 35% of the variance in the total energy expenditure of the adolescent and young adult cohort, respectively. The explained variance increased to 78%, with a standard error of estimate of 7%, when 3dNXTM output was combined with body composition variables. The 3dNXTM accelerometer can be used to predict free-living daily energy expenditure with a standard error of estimate of 1.65 MJ in adolescents and 1.52 MJ in young adults. The inclusion of anthropometric variables reduces the error to approximately 1 MJ. Although it remains to cross-validate these models in other populations, early indications suggest that the 3dNXTM provides a useful method of predicting energy expenditure in free-living individuals.
    Citation
    Journal of Sports Sciences, 26(6): 553-561
    Publisher
    Routledge (Taylor & Francis)
    Journal
    Journal of Sports Sciences
    URI
    http://hdl.handle.net/2436/50574
    DOI
    10.1080/02640410701708979
    Additional Links
    http://www.informaworld.com/smpp/content~db=all?content=10.1080/02640410701708979
    Type
    Journal article
    Language
    en
    ISSN
    02640414
    1466447X
    ae974a485f413a2113503eed53cd6c53
    10.1080/02640410701708979
    Scopus Count
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    Faculty of Education, Health and Wellbeing

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