Erratum: Lower oxidation of a high molecular weight glucose polymer vs. glucose during cycling

Abstract

We previously reported no difference in the oxidation rate of a high molecular weight glucose polymer (GP) vs. maltodextrin (8 kDa) during exercise; however, the ingestion rate (1.8 g·min–1) was above the glucose absorption–oxidation maxima (∼1.0 g·min–1), possibly masking either faster gastric emptying of the GP and delivery to the circulation observed at rest or physical properties of the GP that might slow intestinal absorption. Therefore, we asked whether GP oxidation could be differentially affected when ingested at a lower rate (0.8 g·min–1). Eight cyclists performed three 150-min rides at 50% peak power while ingesting solutions containing 8% GP (500–750 kDa, 21 mosm·kg–1), 8% glucose (469 mosm·kg–1), or water. The exogenous carbohydrate oxidation rate was determined using stable isotope methodology and indirect calorimetry. Glucose and GP were oxidized on average at 0.54 g·min–1 (coefficient of variation (CV) 37%) and 0.41 g·min–1 (CV 60%), respectively, which equated to a moderate (effect size) r...