<sup>13</sup> C-labelled glucose-fructose show greater exogenous and whole-body CHO oxidation and lower O <sub>2</sub> cost of running at 120 versus 60 and 90 g·h <sup>−1</sup> in elite male marathoners
Samanvita Ravikanti, Kathelijne G. Silang, Henry J. Martyn, Kelsie Olivia Johnson, Julien Louis, Theodoros M. Bampouras, Daniel J. Owens, Andrew M. Jones, James P. Morton, Jamie Pugh
Abstract
We used stable isotope methodology to evaluate exogenous rates of CHO oxidation in elite male marathoners. We report that 120 (maltodextrin:fructose ratio 1:1) g·h −1 CHO induces greater whole body and exogenous CHO oxidation compared with 60 (1:0)–90 (2:1) g·h −1 and reduces the O 2 cost of running. However, the performance implications of such doses remain to be determined. The prevalence of GI symptoms across the doses suggests targeted fueling practice and gut training is warranted.
Topics & Concepts
IngestionMealMedicineAnimal scienceBody weightAnaerobic exerciseRespiratory exchange ratioInternal medicineIncidence (geometry)EndocrinologyLactic acidChinese hamster ovary cellPhysiologyExercise physiologyEndurance trainingCarbohydrateStomachChemistryWeight lossPhysical exerciseFood sciencePhysical therapyMuscle metabolism and nutritionDiet, Metabolism, and DiseaseMicrobial Metabolites in Food Biotechnology