Cited by 171Muscle metabolism and nutritionSports Performance and TrainingCardiovascular and exercise physiology

High rates of exogenous carbohydrate oxidation from a mixture of glucose and fructose ingested during prolonged cycling exercise

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Jentjens, Roy L. P. G., Jeukendrup, Asker E.·2005·British Journal of Nutrition

Abstract

A recent study from our laboratory has shown that a mixture of glucose and fructose ingested at a rate of 1·8 g/min leads to peak oxidation rates of approximately 1·3 g/min and results in approximately 55 % higher exogenous carbohydrate (CHO) oxidation rates compared with the ingestion of an isocaloric amount of glucose. The aim of the present study was to investigate whether a mixture of glucose and fructose when ingested at a high rate (2·4 g/min) would lead to even higher exogenous CHO oxidation rates (>1·3 g/min).Eight trained male cyclists (VO 2max: 68±1 ml/kg per min) cycled on three different occasions for 150 min at 50 % of maximal power output (60±1 % VO 2max) and consumed either water (WAT) or a CHO solution providing 1·2 g/min glucose (GLU) or 1.2 g/min glucose+1·2 g/min fructose (GLU+FRUC). Peak exogenous CHO oxidation rates were higher (P<0·01) in the GLU+FRUC trial compared with the GLU trial (1·75 (se 0·11) and 1·06 (se 0·05) g/min, respectively). Furthermore, exogenous CHO oxidation rates during the last 90 min of exercise were approximately 50 % higher (P<0·05) in GLU+FRUC compared with GLU (1·49 (se 0·08) and 0·99 (se 0·06) g/min, respectively). The results demonstrate that when a mixture of glucose and fructose is ingested at high rates (2·4 g/min) during 150 min of cycling exercise, exogenous CHO oxidation rates reach peak values of approximately 1·75 g/min.

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  • Combining the intake of glucose plus fructose can further increase total exogenous carbohydrate availability and allow higher exogenous carbohydrate oxidation rates.

    “Combining the intake of glucose plus fructose can further increase total exogenous carbohydrate availability and, as such, allow higher exogenous carbohydrate oxidation rates.”

    From Fructose co‐ingestion to increase carbohydrate availability in athletes (2019) · cites this paper as Jentjens & Jeukendrup, 2005

  • When fructose is co-ingested with glucose during exercise at 50% maximum power output, exogenous carbohydrate oxidation rates can increase up to 1.75 g/min.

    “However, when fructose is co‐ingested with glucose during exercise (at 50% maximum power output (W max)), exogenous carbohydrate oxidation rates can increase up to 1.75 g/min (Jentjens & Jeukendrup, 2005), which is substantially higher than the rates reported following ingestion of glucose (polymers) or fructose only.”

    From Fructose co‐ingestion to increase carbohydrate availability in athletes (2019) · cites this paper as Jentjens & Jeukendrup, 2005

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  1. Jentjens RLPG, Shaw C, Birtles T, Waring RH, Harding LE & Jeukendrup AE (in press) Oxidation of combined ingestion of glucose and sucrose during exercise. Metabolism.

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Authors
Jentjens, R. L. P. G., & Jeukendrup, A. E.
Affiliations
University of Birmingham (GB)
Corresponding author
Jeukendrup, Asker E.
Venue
British Journal of Nutrition
Published
2005-04
Volume
93
Issue
4
Pages
485-492
ISSN
  • 0007-1145 (ISSN-L)
  • 1475-2662
OpenAlex
W2142308193
Cited by
171
References
71
Citations by year
2026: 8 · 2025: 4 · 2024: 6 · 2023: 4 · 2022: 6 · 2021: 3 · 2020: 9 · 2019: 12 · 2018: 8 · 2017: 9 · 2016: 4 · 2015: 6 · 2014: 8 · 2013: 7 · 2012: 15
FWCI
3.65
Type
journal article
Language
en
Open access
Locations
  • British Journal Of Nutrition (publishedVersion)
  • PubMed (publishedVersion)
  • University of Birmingham Research Portal (University of Birmingham) (submittedVersion)
Funders
GlaxoSmithKline
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
Keywords
exogenous carbohydrate oxidation, glucose, fructose, endurance exercise, cycling exercise, carbohydrate supplementation, trained cyclists
MeSH terms
Adult, Analysis of Variance, Bicycling, Dietary Carbohydrates, Fructose, Glucose, Humans, Isotope Labeling, Male, Oxidation-Reduction, Oxygen Consumption, Physical Endurance

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