Cited by 117Muscle metabolism and nutritionCardiovascular and exercise physiologySports Performance and Training

Carbohydrate ingestion and glycogen utilization in different muscle fibre types in man

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Tsintzas, O K, Williams, C, Boobis, L, Greenhaff, P·1995·The Journal of Physiology

Abstract

1. The effect of carbohydrate (CHO) ingestion on muscle glycogen utilization during exercise was examined on seven male subjects completing two 60 min treadmill runs at 70% maximum oxygen uptake (VO2,max), 1 week apart. On each occasion the subjects consumed either water or a 5.5% CHO-electrolyte solution immediately before and during exercise. Muscle samples were obtained from the vastus lateralis by needle biopsy before and immediately after exercise. Venous blood samples were also collected from an ante-cubital vein at rest and at 10, 20, 40 and 60 min into the run. 2. Higher blood glucose concentrations (P < 0.01) were observed throughout the run during the CHO trial compared with the water trial. Serum insulin concentration was only higher after 20 min of exercise (P < 0.01). 3. A 28% reduction in mixed glycogen utilization was observed as a result of CHO ingestion when compared with water ingestion (108.7 +/- 16.3 vs. 150.9 +/- 19.9 mmol (kg dry matter)-1, respectively; P < 0.01). 4. The ingestion of the CHO solution resulted in sparing of glycogen in type I (slow twitch) fibres only (38 +/- 7% degradation of glycogen as opposed to 66 +/- 3% during the water trial; P = 0.01).

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Registry

Crossref · 10.1113/jphysiol.1995.sp021046

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28 of 28 references verified0 citation errors · 0 not checkable

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  • When ingesting carbohydrates during constant pace running, carbohydrate oxidation can be maintained, thus sparing muscle glycogen through preferential oxidation from this exogenous carbohydrate source, in particular type I muscle fibres.

    “For example, when ingesting carbohydrates during constant pace running, carbohydrate oxidation can be maintained, thus sparing muscle glycogen through preferential oxidation from this exogenous carbohydrate source [25], in particular type I muscle fibres [74].”

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Authors
Tsintzas, O. K., Williams, C., Boobis, L., & Greenhaff, P.
Affiliations
Loughborough University (GB)
Venue
The Journal of Physiology
Publisher
Wiley
Published
1995-11-15
Volume
489
Issue
1
Pages
243-250
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W1982479833
Cited by
117
References
28
Citations by year
2026: 2 · 2025: 3 · 2024: 3 · 2022: 3 · 2021: 3 · 2020: 6 · 2019: 4 · 2018: 7 · 2017: 4 · 2016: 2 · 2015: 8 · 2014: 4 · 2013: 5 · 2012: 7
FWCI
0.68
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (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 › Orthopedics and Sports Medicine › Sports Performance and Training
Keywords
carbohydrate intake, muscle glycogen utilization, muscle fiber type, type I muscle fibers, fast-twitch muscle, physical activity, blood glucose, serum insulin, glycogen sparing, vastus lateralis, endurance running, carbohydrate-electrolyte solution
MeSH terms
Adult, Blood Glucose, Carbohydrates, Glycogen, Humans, Male, Muscles, Time Factors, Exercise, Muscle Fibers, Slow-Twitch

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