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  • Daily training with high carbohydrate availability increases exogenous carbohydrate oxidation during endurance cycling

    Author(s)
    Cox, Gregory R.
    Clark, Sally A.
    Cox, Amanda J.
    Halson, Shona L.
    Hargreaves, Mark
    Hawley, John A.
    Jeacocke, Nikki
    Snow, Rodney J.
    Yeo, Wee Kian
    Burke, Louise M.
    Griffith University Author(s)
    Cox, Amanda J.
    Year published
    2010
    Metadata
    Show full item record
    Abstract
    We determined the effects of varying daily carbohydrate intake by providing or withholding carbohydrate during daily training on endurance performance, whole body rates of substrate oxidation, and selected mitochondrial enzymes. Sixteen endurance-trained cyclists or triathletes were pair matched and randomly allocated to either a high-carbohydrate group (High group; n = 8) or an energy-matched low-carbohydrate group (Low group; n = 8) for 28 days. Immediately before study commencement and during the final 5 days, subjects undertook a 5-day test block in which they completed an exercise trial consisting of a 100 min of ...
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    We determined the effects of varying daily carbohydrate intake by providing or withholding carbohydrate during daily training on endurance performance, whole body rates of substrate oxidation, and selected mitochondrial enzymes. Sixteen endurance-trained cyclists or triathletes were pair matched and randomly allocated to either a high-carbohydrate group (High group; n = 8) or an energy-matched low-carbohydrate group (Low group; n = 8) for 28 days. Immediately before study commencement and during the final 5 days, subjects undertook a 5-day test block in which they completed an exercise trial consisting of a 100 min of steady-state cycling (100SS) followed by a 7-kJ/kg time trial on two occasions separated by 72 h. In a counterbalanced design, subjects consumed either water (water trial) or a 10% glucose solution (glucose trial) throughout the exercise trial. A muscle biopsy was taken from the vastus lateralis muscle on day 1 of the first test block, and rates of substrate oxidation were determined throughout 100SS. Training induced a marked increase in maximal citrate synthase activity after the intervention in the High group (27 vs. 34 孯l秭1筩n-1, P < 0.001). Tracer-derived estimates of exogenous glucose oxidation during 100SS in the glucose trial increased from 54.6 to 63.6 g (P < 0.01) in the High group with no change in the Low group. Cycling performance improved by ~6% after training. We conclude that altering total daily carbohydrate intake by providing or withholding carbohydrate during daily training in trained athletes results in differences in selected metabolic adaptations to exercise, including the oxidation of exogenous carbohydrate. However, these metabolic changes do not alter the training-induced magnitude of increase in exercise performance.
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    Journal Title
    Journal of Applied Physiology
    Volume
    109
    DOI
    https://doi.org/10.1152/japplphysiol.00950.2009
    Copyright Statement
    Self-archiving of the author-manuscript version is not yet supported by this journal. Please refer to the journal link for access to the definitive, published version or contact the authors for more information.
    Subject
    Biological Sciences not elsewhere classified
    Medical and Health Sciences not elsewhere classified
    Biological Sciences
    Medical and Health Sciences
    Publication URI
    http://hdl.handle.net/10072/61615
    Collection
    • Journal articles

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