The effects of isomaltulose ingestion on gastric parameters and cycling performance in young men

Masashi Miyashita*, Yuka Hamada, Kyoko Fujihira, Saki Namura, Miki Sakazaki, Kiyoaki Miyasaka, Yukie Nagai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Background/Objective: Isomaltulose is a disaccharide with a low glycaemic index and plays a role in maintaining postprandial glucose. The maintenance of glucose availability during prolonged exercise has been shown to enhance exercise performance. The present study compared the effects of pre-exercise isomaltulose versus maltodextrin ingestion on gastric parameters and cycling performance in young men. Methods: Fourteen young men (mean ± S.D., age 23 ± 2 years) performed 60 min of continuous cycling at 75% of maximum heart rate followed by a 15-min exercise performance test while ingesting a 500-mL of water containing 100 mg of 13C-sodium acetate with either 50 g of isomaltulose or 50 g of maltodextrin. Gastrointestinal discomfort was assessed periodically using an 11-point visual analogue scale throughout the study. The gastric emptying rate was evaluated periodically with the 13C-sodium acetate breath test. For the exercise performance test, participants were instructed to pedal a cycle ergometer, exerting as much effort as possible at a self-selected pace. Results: Plasma glucose and insulin concentrations measured at 30 min after ingestion were lower in the isomaltulose trial than in the maltodextrin trial. There were no differences in mean power output during the exercise performance test, gastric emptying rate or the subjective feelings of gastrointestinal discomfort between both trials. Conclusion: Under the current exercise protocol, pre-exercise ingestion of isomaltulose compared with maltodextrin provided no additional benefit relative to gastric emptying or aerobic exercise performance. Both isomaltulose and maltodextrin ingestion did not influence gastrointestinal distress during 60 min of cycling and performance test.

Original languageEnglish
Pages (from-to)101-107
Number of pages7
JournalJournal of Exercise Science and Fitness
Issue number3
Publication statusPublished - 2019 Jul


  • Exercise performance
  • Gastrointestinal discomfort
  • Isomaltulose
  • Metabolic response
  • Stable isotope

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Public Health, Environmental and Occupational Health


Dive into the research topics of 'The effects of isomaltulose ingestion on gastric parameters and cycling performance in young men'. Together they form a unique fingerprint.

Cite this