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Fructose and sucrose intake increase exogenous carbohydrate oxidation during exercise
Trommelen, Jorn Fuchs, Cas J. Beelen, M Lenaerts, Kaatje Jeukendrup, A. E. Cermak, N. Van Loon, Luc
Trommelen, Jorn
Fuchs, Cas J.
Beelen, M
Lenaerts, Kaatje
Jeukendrup, A. E.
Cermak, N.
Van Loon, Luc
Abstract
Peak exogenous carbohydrate oxidation rates typically reach ~1 g∙min−1 during exercise when ample glucose or glucose polymers are ingested. Fructose co‐ingestion has been shown to further increase exogenous carbohydrate oxidation rates. The purpose of this study was to assess the impact of fructose co‐ingestion provided either as a monosaccharide or as part of the disaccharide sucrose on exogenous carbohydrate oxidation rates during prolonged exercise in trained cyclists. Ten trained male cyclists (VO2peak: 65 ± 2 mL∙kg−1∙min−1) cycled on four different occasions for 180 min at 50% Wmax during which they consumed a carbohydrate solution providing 1.8 g∙min−1 of glucose (GLU), 1.2 g∙min−1 glucose + 0.6 g∙min−1 fructose (GLU + FRU), 0.6 g∙min−1 glucose + 1.2 g∙min−1 sucrose (GLU + SUC), or water (WAT). Peak exogenous carbohydrate oxidation rates did not differ between GLU + FRU and GLU + SUC (1.40 ± 0.06 vs. 1.29 ± 0.07 g∙min−1, respectively, p = 0.999), but were 46% ± 8% higher when compared to GLU (0.96 ± 0.06 g∙min−1: p < 0.05). In line, exogenous carbohydrate oxidation rates during the latter 120 min of exercisewere 46% ± 8% higher in GLU + FRU or GLU + SUC compared with GLU (1.19 ± 0.12, 1.13 ± 0.21, and 0.82 ± 0.16 g∙min−1, respectively, p < 0.05). We conclude that fructose co‐ingestion (0.6 g∙min−1) with glucose (1.2 g∙min−1) provided either as a monosaccharide or as sucrose strongly increases exogenous carbohydrate oxidation rates during prolonged exercise in trained cyclists. Supplemental Table 1 is included at the end of the article.
Keywords
metabolism, stable isotopes, substrate utilization, sugar
Date
2017
Type
Journal article
Journal
Nutrients
Book
Volume
9
Issue
2
Page Range
1-12
Article Number
ACU Department
Centre for Exercise and Nutrition
Faculty of Health Sciences
Faculty of Health Sciences
Collections
Relation URI
Source URL
Event URL
Open Access Status
Open access
License
CC BY 4.0
File Access
Open