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Cited by 129Muscle metabolism and nutritionSports Performance and TrainingCardiovascular and exercise physiology

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Influence of carbohydrate dosage on exercise performance and glycogen metabolism

Mitchell, J. B., Costill, D. L., Houmard, J. A., Fink, W. J., Pascoe, D. D., Pearson, D. R.·1989·Journal of Applied Physiology
DOI 10.1152/jappl.1989.67.5.1843
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Abstract

This study was undertaken to examine the effects of ingestion of carbohydrate (CHO) solutions of 0 (WP), 6 (CHO-6), 12 (CHO-12), and 18 g CHO/100 ml (CHO-18) on performance and muscle glycogen use. Ten trained cyclists performed five 120-min cycling trials. The first 105 min of each trial was at 70% of maximal O2 consumption (VO2max), and the final 15 min was an all-out performance ride on an isokinetic cycle ergometer equipped to measure total work output. In one of the trials (CHO-12I) the submaximal portion of the ride consisted of seven 15-min rides at 70% of VO2max with a 3-min rest between each ride. Every 15 min the men consumed 8.5 ml.kg-1.h-1 (approximately 150 ml) of one of the four test solutions. Venous blood samples were obtained every 15 min for glucose and insulin. Muscle biopsies were obtained from the vastus lateralis at 0 and 105 min in the WP and the CHO-12 continuous and intermittent trials. Biopsy samples were assayed for glycogen and sectioned and stained for myosin adenosinetriphosphatase and glycogen for single fiber depletion measurements. There were no differences in glycogen use (86.7 +/- 6.0, 75.5 +/- 7.9, and 83.5 +/- 5.5 mmol/kg for the WP, CHO-12C, and CHO-12I, respectively) or depletion patterns between the WP and the two CHO-12 trials. Blood glucose was significantly elevated in both the CHO-12 trials and in the CHO-18 trial compared with the WP trial.(ABSTRACT TRUNCATED AT 250 WORDS)

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Metadata

Authors
Mitchell, J. B., Costill, D. L., Houmard, J. A., Fink, W. J., Pascoe, D. D., & Pearson, D. R.
Affiliations
Ball State University (US)
ORCID
Houmard, J. A.
Venue
Journal of Applied Physiology
Publisher
American Physiological Society
Published
1989-11-01
Volume
67
Issue
5
Pages
1843-1849
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
DOI
10.1152/jappl.1989.67.5.1843
OpenAlex
W1808457245
Cited by
129
References
0
Citations by year
2026: 1 · 2025: 3 · 2024: 2 · 2023: 1 · 2022: 2 · 2021: 2 · 2020: 1 · 2019: 3 · 2018: 1 · 2017: 5 · 2016: 2 · 2015: 3 · 2014: 4 · 2013: 7 · 2012: 3
FWCI
0.75
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
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 intake, exercise performance, muscle glycogen, glycogen depletion, endurance cycling, blood glucose, insulin, myosin ATPase, single fiber analysis
MeSH terms
Adult, Analysis of Variance, Blood Glucose, Dietary Carbohydrates, Eating, Exercise Test, Physical Exertion, Glycogen, Heart Rate, Humans, Male, Muscles, Oxygen Consumption, Pulmonary Gas Exchange, Work Capacity Evaluation

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