Cited by 167Muscle metabolism and nutritionSports Performance and TrainingCardiovascular and exercise physiology

The DOI matches its Crossref record; 47 of the 47 references it cites were found in a registry or an index.

Daily training with high carbohydrate availability increases exogenous carbohydrate oxidation during endurance cycling

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Abstract

We determined the effects of varying daily carbohydrate intake by providing or withholding carbohydrate during daily training on endurance performance, whole body rates of substrate oxidation, and selected mitochondrial enzymes. Sixteen endurance-trained cyclists or triathletes were pair matched and randomly allocated to either a high-carbohydrate group (High group; n = 8) or an energy-matched low-carbohydrate group (Low group; n = 8) for 28 days. Immediately before study commencement and during the final 5 days, subjects undertook a 5-day test block in which they completed an exercise trial consisting of a 100 min of steady-state cycling (100SS) followed by a 7-kJ/kg time trial on two occasions separated by 72 h. In a counterbalanced design, subjects consumed either water (water trial) or a 10% glucose solution (glucose trial) throughout the exercise trial. A muscle biopsy was taken from the vastus lateralis muscle on day 1 of the first test block, and rates of substrate oxidation were determined throughout 100SS. Training induced a marked increase in maximal citrate synthase activity after the intervention in the High group (27 vs. 34 μmol·g−1·min−1, P < 0.001). Tracer-derived estimates of exogenous glucose oxidation during 100SS in the glucose trial increased from 54.6 to 63.6 g ( P < 0.01) in the High group with no change in the Low group. Cycling performance improved by ∼6% after training. We conclude that altering total daily carbohydrate intake by providing or withholding carbohydrate during daily training in trained athletes results in differences in selected metabolic adaptations to exercise, including the oxidation of exogenous carbohydrate. However, these metabolic changes do not alter the training-induced magnitude of increase in exercise performance.

Overview

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Registry

Crossref · 10.1152/japplphysiol.00950.2009

Cites

47 of 47 references verified0 citation errors · 0 not checkable

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Research works printed but not linked: 3

  1. Gulbin JP, 1999, J Sports Med Phys Fitness, 39, 12
  2. Peronnet F, 1991, Can J Sport Sci, 16, 23
  3. Scherrer S, 1978, Clin Sci Mol Med, 54, 133

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Metadata

Authors
Cox, G. R., Clark, S. A., Cox, A. J., Halson, S. L., Hargreaves, M., Hawley, J. A., Jeacocke, N., Snow, R. J., Yeo, W. K., & Burke, L. M.
Affiliations
  • Deakin University (AU)
  • Physiology, Australian Institute of Sport, Belconnen;
  • University of Newcastle Australia (AU)
  • The University of Melbourne (AU)
  • RMIT University (AU)
  • Sports Nutrition, Australian Institute of Sport, Belconnen;
Corresponding author
Cox, Gregory R.
Venue
Journal of Applied Physiology
Published
2010-07
Volume
109
Issue
1
Pages
126-134
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2092809716
Cited by
165
References
47
Citations by year
2026: 4 · 2025: 11 · 2024: 4 · 2023: 6 · 2022: 5 · 2021: 12 · 2020: 11 · 2019: 19 · 2018: 8 · 2017: 11 · 2016: 13 · 2015: 7 · 2014: 14 · 2013: 19 · 2012: 9
FWCI
5.58
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • Research Bank (Australian Catholic University) (submittedVersion)
  • RMIT Research Repository (RMIT University Library) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
  • Griffith Research Online (submittedVersion)
  • NOVA (University of Newcastle Australia) (submittedVersion)
Funders
Australian Institute of Sport
Topics
  • Health Sciences › Nursing › Nutrition and Dietetics › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
  • Health Sciences › Medicine › Physiology (medical) › Cardiovascular and exercise physiology
Keywords
carbohydrate availability, carbohydrate restriction, endurance training, substrate oxidation, citrate synthase, mitochondrial enzymes, endurance cycling performance, trained cyclists, triathletes
MeSH terms
Adaptation, Physiological, Adult, Citrate (si)-Synthase, Diet, Dietary Carbohydrates, Energy Metabolism, Exercise Test, Glucose, Glycogen, Humans, Male, Physical Endurance, Exercise, Muscle, Skeletal, Young Adult, Athletes

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