Influence of beverage administration on plasma deuterium enrichment (ppm). Figure 4 shows the impact of the test beverages on plasma deuterium enrichment, which was employed as a semi-quantitative method for assessing fluid delivery. Data are presented as mean ± SE; n = 7. P, Placebo; MD, maltodextrin beverage; MD + F, maltodextrin-fructose beverage. *denotes significant difference (P < 0.025) to P. † denotes significant difference (P < 0.039) to P. ‡ denotes significant difference between MD and MD + F (P < 0.05).