Research

Ingesting a high-dose carbohydrate solution during the cycle section of a simulated olympicdistance triathlon improves subsequent run performance


Reference:

McGawley, K., Shannon, O. and Betts, J., 2012. Ingesting a high-dose carbohydrate solution during the cycle section of a simulated olympicdistance triathlon improves subsequent run performance. Applied Physiology Nutrition and Metabolism, 37 (4), pp. 664-671.

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    Official URL:

    http://dx.doi.org/10.1139/H2012-040

    Abstract

    The well-established ergogenic benefit of ingesting carbohydrates during single-discipline endurance sports has only been tested once within an Olympic-distance (OD) triathlon. The aim of the present study was to compare the effect of ingesting a 2:1 maltodextrin/fructose solution with a placebo on simulated OD triathlon performance. Six male and 4 female amateur triathletes (age, 25 ± 7 years; body mass, 66.8 ± 9.2 kg; peak oxygen uptake, 4.2 ± 0.6 L·min -1) completed a 1500-m swim time-trial and an incremental cycle test to determine peak oxygen uptake before performing 2 simulated OD triathlons. The swim and cycle sections of the main trials were of fixed intensities, while the run section was completed as a time-trial. Two minutes prior to completing every quarter of the cycle participants consumed 202 ± 20 mL of either a solution containing 1.2 g·min -1 of maltodextrin plus 0.6 g·min -1 of fructose at 14.4% concentration (CHO) or a sugar-free, fruit-flavored drink (PLA). The time-trial was 4.0% ± 1.3% faster during the CHO versus PLA trial, with run times of 38:43 ± 1:10 min:s and 40:22 ± 1:18 min:s, respectively (p = 0.010). Blood glucose concentrations were higher in the CHO versus PLA trial (p < 0.001), while perceived stomach upset did not differ between trials (p = 0.555). The current findings show that a 2:1 maltodextrin/fructose solution (1.8 g·min -1 at 14.4%) ingested throughout the cycle section of a simulated OD triathlon enhances subsequent 10-km run performance in triathletes.

    Details

    Item Type Articles
    CreatorsMcGawley, K., Shannon, O. and Betts, J.
    DOI10.1139/H2012-040
    DepartmentsFaculty of Humanities & Social Sciences > Health
    RefereedYes
    StatusPublished
    ID Code30919

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