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Cited by 88Muscle metabolism and nutritionCardiovascular and exercise physiologySports Performance and Training

Exogenous glucose oxidation during exercise in endurance-trained and untrained subjects

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Jeukendrup, A. E., Mensink, M., Saris, W. H. M., Wagenmakers, A. J. M.·1997·Journal of Applied Physiology
DOI 10.1152/jappl.1997.82.3.835
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Abstract

To investigate the effect of training status on the fuel mixture used during exercise with glucose ingestion, seven endurance-trained cyclists (Tr; maximum O2 uptake 67 +/- 2.3 ml.kg-1.min-1) and eight untrained subjects (UTr; 48 +/- 2 ml.kg-1.min-1) were studied during 120 min of exercise at approximately 60% maximum O2 uptake. At the onset of exercise, 8 ml.kg-1.min-1 of an 8% naturally enriched [13C]glucose solution was ingested and 2 ml/kg every 15 min thereafter. Energy expenditure was higher in Tr subjects compared with UTr subjects (3,404 vs. 2,630 kJ; P < 0.01). During the second hour, fat oxidation was higher in Tr subjects (37 +/- 2 g) compared with UTr subjects (23 +/- 1 g), whereas carbohydrate oxidation was similar (116 +/- 8 g in Tr subjects vs. 114 +/- 4 g in UTr subjects). No differences were observed in exogenous glucose oxidation (50 +/- 2 g in Tr subjects and 45 +/- 3 g in UTr subjects, respectively). Peak exogenous glucose oxidation rates were similar in the two groups (0.95 +/- 0.07 g/min in Tr subjects and 0.96 +/- 0.03 g/min in UTr subjects). It is concluded that the higher energy expenditure in Tr subjects during exercise at the same relative exercise intensity is entirely met by a higher rate of fat oxidation without changes in the rates of exogenous and endogenous carbohydrates.

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  • Endurance training influences substrate selection during exercise and thus contributes to the rate of endogenous carbohydrate metabolism during exercise.

    “Endurance training influences substrate selection during exercise and thus contributes to the rate of endogenous carbohydrate metabolism during exercise [21,91,92,93].”

    From Regulation of Energy Substrate Metabolism in Endurance Exercise (2021) · cites this paper as [21]

    The available passages identify a study of exogenous glucose oxidation in endurance-trained and untrained subjects, but provide no finding about endogenous carbohydrate metabolism or how training affects substrate selection. Searches for those terms and for glycogen oxidation returned only the title and bibliographic information. (LLM, conf=0.74)

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Authors
Jeukendrup, A. E., Mensink, M., Saris, W. H. M., & Wagenmakers, A. J. M.
Affiliations
Maastricht University (NL)
ORCID
Venue
Journal of Applied Physiology
Publisher
American Physiological Society
Published
1997-03-01
Volume
82
Issue
3
Pages
835-840
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
DOI
10.1152/jappl.1997.82.3.835
OpenAlex
W2137863001
Cited by
88
References
38
Citations by year
2026: 1 · 2025: 3 · 2024: 4 · 2023: 1 · 2022: 6 · 2021: 5 · 2020: 4 · 2019: 2 · 2018: 4 · 2016: 2 · 2015: 3 · 2014: 2 · 2013: 8 · 2012: 1
FWCI
0.87
Type
journal article
Language
en
Open access
Licence
other-oa
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • Research Publications (Maastricht University) (publishedVersion, other-oa)
  • Socio-Environmental Systems Modeling (acceptedVersion)
  • Research Publications (Maastricht University) (submittedVersion, other-oa)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
Funders
Universiteit Maastricht
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 › Orthopedics and Sports Medicine › Sports Performance and Training
Keywords
endurance training, fat oxidation, carbohydrate oxidation, energy expenditure, training status, 13C-labeled glucose, cyclists, energy substrate utilization
MeSH terms
Adult, Energy Metabolism, Female, Glucose, Humans, Male, Exercise

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