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    Does diet mediate associations of volume and bouts of sedentary time with cardiometabolic health indicators in adolescents?

    Access Status
    Open access via publisher
    Authors
    Fletcher, E.
    Carson, V.
    McNaughton, S.
    Dunstan, D.
    Healy, Genevieve
    Salmon, J.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Fletcher, E. and Carson, V. and McNaughton, S. and Dunstan, D. and Healy, G. and Salmon, J. 2017. Does diet mediate associations of volume and bouts of sedentary time with cardiometabolic health indicators in adolescents?. Obesity. 25 (3): pp. 591-599.
    Source Title
    Obesity
    DOI
    10.1002/oby.21750
    ISSN
    1930-7381
    School
    School of Physiotherapy and Exercise Science
    URI
    http://hdl.handle.net/20.500.11937/63252
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 The Authors. Obesity published by Wiley Periodicals, Inc. on behalf of The Obesity Society (TOS) Objective: Examine the mediating role of diet in the relationship between volume and duration of sedentary time with cardiometabolic health in adolescents. Methods: Adolescents (12-19 years) participating in the 2003/04 and 2005/06 U.S. National Health and Nutrition Examination Survey (NHANES) were examined. Cardiometabolic health indicators were body mass index z-scores (zBMI) (n = 1,797) and metabolic syndrome (MetS) (n = 812). An ActiGraph hip-worn accelerometer was used to derive total sedentary time and usual sedentary bout duration. Dietary intake was assessed using two 24-hour dietary recalls. Mediation analyses were conducted to examine five dietary mediators [total energy intake, discretionary foods, sugar-sweetened beverages (SSB), fruits and vegetables, and dietary quality] of the relationship between total sedentary time and usual sedentary bout duration with zBMI and MetS. Results: Total sedentary time was inversely associated with zBMI (β = −1.33; 95% CI −2.53 to −0.13) but attenuated after adjusting for moderate-to-vigorous physical activity. No significant associations were observed between usual sedentary bout duration with zBMI or either sedentary measure with MetS. None of the five dietary variables mediated any of the relationships examined. Conclusions: Further studies are needed to explore associations of specific time periods (e.g., after school) and bout durations with both cardiometabolic health indicators and dietary behaviors.

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