Paper
Effect of preexercise ingestion of modified cornstarch on substrate oxidation during endurance exercise.
Published Jun 1, 2007 · Neil M. Johannsen, R. Sharp
International journal of sport nutrition and exercise metabolism
13
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Abstract
The purpose of this study was to investigate differences in substrate oxidation between dextrose (DEX) and unmodified (UAMS) and acid/alcohol-modified (MAMS) cornstarches. Seven endurance-trained men (VO2peak = 59.1 +/- 5.4 mL.kg-1.min-1) participated in 2 h of exercise (66.4% +/- 3.3% VO2peak) 30 min after ingesting 1 g/kg body weight of the experimental carbohydrate or placebo (PLA). Plasma glucose and insulin were elevated after DEX (P < 0.05) compared with UAMS, MAMS, and PLA. Although MAMS and DEX raised carbohydrate oxidation rate through 90 min of exercise, only MAMS persisted throughout 120 min (P < 0.05 compared with all trials). Exogenous-carbohydrate oxidation rate was higher in DEX than in MAMS and UAMS until 90 min of exercise. Acid/alcohol modification resulted in augmented carbohydrate oxidation with a small, sustained increase in exogenous-carbohydrate oxidation rate. MAMS appears to be metabolizable and available for oxidation during exercise.
RCTPreexercise ingestion of acid/alcohol-modified cornstarch (MAMS) increases carbohydrate oxidation during endurance exercise, while dextrose and unmodified cornstarch (UAMS) only raise it for 90 minutes.
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