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Cited by 143Muscle metabolism and nutritionCardiovascular and exercise physiologyGastrointestinal motility and disorders

Gastric emptying, absorption, and carbohydrate oxidation during prolonged exercise

Rehrer, N. J., Wagenmakers, A. J., Beckers, E. J., Halliday, D., Leiper, J. B., Brouns, F., Maughan, R. J., Westerterp, K. +1 more·1992·Journal of Applied Physiology
DOI 10.1152/jappl.1992.72.2.468
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Abstract

This study was designed to examine aspects of digestive function that may limit assimilation of water and oxidation of orally ingested carbohydrate (CHO) during exercise. Eight males completed a crossover study in which each cycled on four occasions for 80 min at 70% maximal O2 consumption. Beverage was consumed at 0, 20, 40, and 60 min. Beverages were water, 4.5% glucose (4.5G), 17% glucose (17G), and 17% maltodextrin (17MD). CHO beverages contained 20 meq/l NaCl and were 13C enriched to measure exogenous CHO oxidation. Gastric (beverage) volume was measured at 80 min. Water uptake was estimated by including 2H2O in the beverage and measuring 2H accumulation in blood. Jejunal perfusion tests were conducted at rest with the same subjects and beverages. In 60 min, 1,294 +/- 31 (SE) ml were ingested; at 80 min, volumes emptied with H2O (1,257 +/- 32 ml) and 4.5G (1,223 +/- 32 ml) were greater than with 17G (781 +/- 56 ml) and 17MD (864 +/- 71 ml; P less than 0.05). Total CHO oxidized was similar with all beverages, but there was a greater increase in exogenous CHO oxidation over time with 17G and 17MD than with 4.5G; 54, 19, and 18% of the CHO ingested with 4.5G, 17G, and 17MD, respectively, was oxidized. This represents 57, 32, and 27%, respectively, of the CHO emptied from the stomach. 2H accumulation in the blood was more rapid with H2O and 4.5G than with 17G or 17MD. Net jejunal water absorption was greater from 4.5G than from water. Net water absorption was also observed f…

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  • The primary limitation of exogenous carbohydrate oxidation rates is unlikely to be caused by gastric emptying rates, as gastric emptying rates of glucose exceed carbohydrate oxidation rates during prolonged exercise.

    “The primary limitation of exogenous carbohydrate oxidation rates is unlikely to be caused by gastric emptying rates, as gastric emptying rates of glucose have been shown to exceed carbohydrate oxidation rates during prolonged exercise (Rehrer et al. 1992).”

    From Fructose co‐ingestion to increase carbohydrate availability in athletes (2019) · cites this paper as Rehrer et al. 1992

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Authors
Rehrer, N. J., Wagenmakers, A. J., Beckers, E. J., Halliday, D., Leiper, J. B., Brouns, F., Maughan, R. J., Westerterp, K., & Saris, W. H.
Affiliations
Université Libre de Bruxelles (BE)
ORCID
Venue
Journal of Applied Physiology
Publisher
American Physiological Society
Published
1992-02-01
Volume
72
Issue
2
Pages
468-475
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
DOI
10.1152/jappl.1992.72.2.468
OpenAlex
W2101471984
Cited by
143
References
0
Citations by year
2026: 3 · 2025: 2 · 2024: 3 · 2023: 1 · 2022: 4 · 2021: 5 · 2020: 12 · 2019: 4 · 2017: 2 · 2016: 1 · 2015: 7 · 2014: 6 · 2013: 6 · 2012: 5
FWCI
1.61
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
Keywords
gastric emptying, carbohydrate absorption, carbohydrate oxidation, prolonged exercise, carbohydrate beverage, glucose, maltodextrin, water uptake (human physiology), jejunal perfusion, 13C-labeled glucose, exercise hydration
MeSH terms
Adult, Body Weight, Dietary Carbohydrates, Digestion, Gastric Emptying, Humans, Intestinal Absorption, Male, Oxidation-Reduction, Plasma Volume, Water, Exercise

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