Cited by 598Cardiovascular and exercise physiologyMuscle metabolism and nutritionMetabolism, Diabetes, and Cancer

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Glucose metabolism during leg exercise in man

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Wahren, John, Felig, Philip, Ahlborg, Gunvor, Jorfeldt, Lennart·1971·Journal of Clinical Investigation

Abstract

Arterial concentrations and net substrate exchange across the leg and splanchnic vascular bed were determined for glucose, lactate, pyruvate, and glycerol in healthy postabsorptive subjects at rest and during 40 min of exercise on a bicycle ergometer at work intensities of 400, 800, and 1200 kg-m/min. Rising arterial glucose levels and small decreases in plasma insulin concentrations were found during heavy exercise. Significant arterial-femoral venous differences for glucose were demonstrated both at rest and during exercise, their magnitude increasing with work intensity as well as duration of the exercise performed. Estimated glucose uptake by the leg increased 7-fold after 40 min of light exercise and 10- to 20-fold at moderate to heavy exercise. Blood glucose uptake could at this time account for 28-37% of total substrate oxidation by leg muscle and 75-89% of the estimated carbohydrate oxidation. Splanchnic glucose production increased progressively during exercise reaching levels 3 to 5-fold above resting values at the heavy work loads. Close agreement was observed between estimates of total glucose turnover during exercise based on leg glucose uptake and splanchnic glucose production. Hepatic gluconeogenesis-estimated from splanchnic removal of lactate, pyruvate, glycerol, and glycogenic amino acids-could supply a maximum of 25% of the resting hepatic glucose production but could account for only 6-11% of splanchnic glucose production after 40 min of moderate to heavy exercise. IT IS CONCLUDED THAT: (a) blood glucose becomes an increasingly important substrate for muscle oxidation during prolonged exercise of this type: (b) peripheral glucose utilization increases in exercise despite a reduction in circulating insulin levels: (c) increased hepatic output of glucose, primarily by means of augmented glycogenolysis, contributes to blood glucose homeostasis in exercise and provides an important source of substrate for exercising muscle.

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Research works printed but not linked: 3

  1. Cahill, G. F., Jr., and 0. E. Owen. 1968. Some ob- servations on carbohydrate metabolism in man. In Car- bohydrate Metabolism and its Disorders. F. Dickens, P. J. Randle, and W. J. Whelan, editors. Academic Press, Inc., New York. 1: 497.
  2. Bradley, S. E. 1946. Liver function as studied by hepatic vein catheterization. In Transactions of the Fifth Con- ference on Liver Injury. Josiah Macy, Jr. Foundation, New York. 38.
  3. Jorfeldt, L., and J. Wahren. 1971. Leg blood flow dur- ing exercise. Clin. Sci. (London). In press.

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Metadata

Authors
Wahren, J., Felig, P., Ahlborg, G., & Jorfeldt, L.
Affiliations
Karolinska Institutet (SE)
Venue
Journal of Clinical Investigation
Published
1971-12-01
Volume
50
Issue
12
Pages
2715-2725
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2011985622
Cited by
598
References
63
Citations by year
2026: 5 · 2025: 4 · 2024: 10 · 2023: 9 · 2022: 16 · 2021: 19 · 2020: 14 · 2019: 6 · 2018: 10 · 2017: 7 · 2016: 11 · 2015: 10 · 2014: 10 · 2013: 11 · 2012: 5
FWCI
21.19
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Medical Research Council
Topics
  • Health Sciences › Medicine › Physiology (medical) › Cardiovascular and exercise physiology
  • Health Sciences › Nursing › Nutrition and Dietetics › Muscle metabolism and nutrition
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
glucose metabolism, leg exercise, glucose uptake, hepatic gluconeogenesis, glycogenolysis, insulin, blood glucose, carbohydrate oxidation, lactate, pyruvate, glycerol, blood flow, exercise intensity, blood glucose homeostasis
MeSH terms
Abdomen, Adult, Blood Glucose, Physical Exertion, Fatty Acids, Nonesterified, Glucose, Glycerol, Heart Rate, Humans, Insulin, Lactates, Leg, Liver, Male, Methods, Muscles, Oxygen, Oxygen Consumption, Pyruvates, Regional Blood Flow, Rest, Time Factors

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