Fructose co-ingestion to increase carbohydrate availability in athletes

Cas J. Fuchs, Javier T. Gonzalez, Luc J. C. van Loon*

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

20 Citations (Web of Science)

Abstract

Carbohydrate availability is important to maximize endurance performance during prolonged bouts of moderate- to high-intensity exercise as well as for acute post-exercise recovery. The primary form of carbohydrates that are typically ingested during and after exercise are glucose (polymers). However, intestinal glucose absorption can be limited by the capacity of the intestinal glucose transport system (SGLT1). Intestinal fructose uptake is not regulated by the same transport system, as it largely depends on GLUT5 as opposed to SGLT1 transporters. Combining the intake of glucose plus fructose can further increase total exogenous carbohydrate availability and, as such, allow higher exogenous carbohydrate oxidation rates. Ingesting a mixture of both glucose and fructose can improve endurance exercise performance compared to equivalent amounts of glucose (polymers) only. Fructose co-ingestion can also accelerate post-exercise (liver) glycogen repletion rates, which may be relevant when rapid (1.2 g/kg/h) are ingested during post-exercise recovery. In conclusion, combined ingestion of fructose with glucose may be preferred over the ingestion of glucose (polymers) only to help trained athletes maximize endurance performance during prolonged moderate- to high-intensity exercise sessions and accelerate post-exercise (liver) glycogen repletion.

Original languageEnglish
Pages (from-to)3549-3560
Number of pages12
JournalJournal of Physiology
Volume597
Issue number14
DOIs
Publication statusPublished - 2 Jul 2019

Keywords

  • Simple Sugars
  • Glucose
  • Sucrose
  • Oxidation
  • Glycogen
  • Liver
  • Metabolism
  • Muscle
  • Resynthesis
  • Sports Nutrition
  • MUSCLE GLYCOGEN-SYNTHESIS
  • HEPATIC GLUCOSE-UPTAKE
  • PROLONGED EXERCISE
  • EXOGENOUS CARBOHYDRATE
  • ENDURANCE PERFORMANCE
  • STRENUOUS EXERCISE
  • INTENSE EXERCISE
  • OXIDATION
  • LIVER
  • METABOLISM

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