Fructose-maltodextrin ratio in a carbohydrate-electrolyte solution differentially affects exogenous carbohydrate oxidation rate, gut comfort, and performance

Nov 13, 2010American journal of physiology. Gastrointestinal and liver physiology

How the ratio of fructose to maltodextrin in a carb-electrolyte drink affects sugar use, digestion comfort, and exercise performance

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Abstract

Mean exogenous carbohydrate oxidation rates were 1.04, 1.14, and 1.05 g/min in 0.5-, 0.8-, and 1.25-Ratios, respectively.

The 0.8-Ratio solution may lead to an 11% increase in carbohydrate oxidation compared to the 0.5-Ratio.
Improvements in peak power performance were observed with the 0.8-Ratio (3.6%) and 1.25-Ratio (3.0%) compared to the 0.5-Ratio.
Stomach fullness, abdominal cramping, and nausea were reported to be lowest with the 0.8-Ratio solution.
Comparisons of fat and total endogenous carbohydrate oxidation rates between the solutions were unclear.
The findings suggest that 0.8- to 1.25-Ratio fructose-maltodextrin solutions may enhance endurance performance.

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Solutions containing multiple carbohydrates utilizing different intestinal transporters (glucose and fructose) show enhanced absorption, oxidation, and performance compared with single-carbohydrate solutions, but the impact of the ratio of these carbohydrates on outcomes is unknown. In a randomized double-blind crossover, 10 cyclists rode 150 min at 50% peak power, then performed an incremental test to exhaustion, while ingesting artificially sweetened water or one of three carbohydrate-salt solutions comprising fructose and maltodextrin in the respective following concentrations: 4.5 and 9% (0.5-Ratio), 6 and 7.5% (0.8-Ratio), and 7.5 and 6% (1.25-Ratio). The carbohydrates were ingested at 1.8 g/min and naturally (13)C-enriched to permit evaluation of oxidation rate by mass spectrometry and indirect calorimetry. Mean exogenous carbohydrate oxidation rates were 1.04, 1.14, and 1.05 g/min (coefficient of variation 20%) in 0.5-, 0.8-, and 1.25-Ratios, respectively, representing likely small increases in 0.8-Ratio of 11% (90% confidence limits; ± 4%) and 10% (± 4%) relative to 0.5- and 1.25-Ratios, respectively. Comparisons of fat and total and endogenous carbohydrate oxidation rates between solutions were unclear. Relative to 0.5-Ratio, there were moderate improvements to peak power with 0.8- (3.6%; 99% confidence limits ± 3.5%) and 1.25-Ratio (3.0%; ± 3.7%) but unclear with water (0.4%; ± 4.4%). Increases in stomach fullness, abdominal cramping, and nausea were lowest with the 0.8- followed by the 1.25-Ratio solution. At high carbohydrate-ingestion rate, greater benefits to endurance performance may result from ingestion of 0.8- to 1.25-Ratio fructose-maltodextrin solutions. Small perceptible improvements in gut comfort favor the 0.8-Ratio and provide a clearer suggestion of mechanism than the relationship with exogenous carbohydrate oxidation.

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Fructose-maltodextrin ratio in a carbohydrate-electrolyte solution differentially affects exogenous carbohydrate oxidation rate, gut comfort, and performance

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