Cited by 99Metabolism, Diabetes, and CancerCardiovascular and exercise physiologyDiabetes, Cardiovascular Risks, and Lipoproteins

Muscle glucose transport: interactions of in vitro contractions, insulin, and exercise

Constable, S. H., Favier, R. J., Cartee, G. D., Young, D. A., Holloszy, J. O.·1988·Journal of Applied Physiology

Abstract

Exercise increases permeability of muscle to glucose. Normally, the effects of exercise and a maximal insulin stimulus on glucose transport are additive. However, the combined effect on rat epitrochlearis muscle permeability to 3-O-methylglucose (3-MG) of a maximal insulin stimulus followed by in vitro contractile activity of 1.24 +/- 0.06 mumol.10 min-1.ml intracellular water-1 was no greater than that of either stimulus alone. We found that this absence of an additive effect was caused by prolonged exposure to an unphysiologically high insulin concentration (20,000 microU/ml for 60 min), which, in addition to stimulating glucose transport, appears to prevent further increases in permeability to glucose. When the treatments were reversed and muscles were first stimulated to contract and then incubated with 20,000 microU/ml insulin, 3-MG uptake (mumol.10 min-1.ml intracellular water-1) increased from a control value of 0.26 +/- 0.03 to 1.80 +/- 0.15, compared with 1.04 +/- 0.06 for contractile activity alone, 1.21 +/- 0.08 for insulin, and 1.88 +/- 0.11 for exercise (swimming) plus insulin. Swimming plus in vitro contractile activity did not have a greater effect than contractile activity alone. Our results provide evidence that 1) the effect of exercise on muscle permeability to glucose is mediated solely by a process associated with contractile activity, and 2) it is advisable to avoid the use of unphysiologically high insulin concentrations in studies designed to elucidate in vivo actions of insulin.

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Crossref · 10.1152/jappl.1988.64.6.2329

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Authors
Constable, S. H., Favier, R. J., Cartee, G. D., Young, D. A., & Holloszy, J. O.
Affiliations
Washington University in St. Louis (US)
Venue
Journal of Applied Physiology
Published
1988-06-01
Volume
64
Issue
6
Pages
2329-2332
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2337102266
Cited by
99
References
0
Citations by year
2024: 2 · 2023: 1 · 2021: 1 · 2020: 1 · 2019: 3 · 2018: 1 · 2017: 2 · 2016: 2 · 2015: 4 · 2014: 5 · 2013: 3
FWCI
1.19
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (2t32am007011-12)
  • National Institute on Aging (AG 00078)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK-18986)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
Keywords
muscle glucose transport, insulin, physical activity, 3-O-methylglucose uptake, epitrochlearis muscle, swimming training, insulin resistance
MeSH terms
Animals, Biological Transport, Active, Physical Exertion, Insulin, Male, Mannitol, Methylglucosides, Methylglycosides, Muscle Contraction, Muscles, Rats, Inbred Strains, Reference Values, Swimming, 3-O-Methylglucose, Rats, In Vitro Techniques

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