Cited by 111Cardiovascular and exercise physiologyMuscle metabolism and nutritionMetabolism, Diabetes, and Cancer

Influence of active muscle mass on glucose homeostasis during exercise in humans

Kjaer, M., Kiens, B., Hargreaves, M., Richter, E. A.·1991·Journal of Applied Physiology

Abstract

To study the effect of increasing amounts of exercising muscle mass on the relationship between glucose mobilization and peripheral glucose uptake, seven young men (23-28 yr) bicycled for 70 min at a work load of 55-60% VO2max. From minute 30 to 50, arm cranking was added and total work load increased to 82 +/- 4% VO2max. During leg exercise, hepatic glucose production (Ra) increased in parallel with peripheral glucose uptake (Rd) and euglycemia was maintained. During arm + leg exercise, Ra increased more than Rd and accordingly plasma glucose increased from 5.11 +/- 0.22 to 8.00 +/- 0.66 mmol/l (P less than 0.05). Plasma catecholamines increased three- to four-fold more during arm + leg exercise than during leg exercise. Leg glucose uptake increased with time regardless of arm cranking. Net leg lactate release during leg exercise was reverted to a net leg lactate uptake during arm + leg exercise. The rate of glycogen breakdown in exercising leg muscle was not altered by addition of arm cranking. In conclusion, when large amounts of muscle mass are active, plasma catecholamines increase sharply and mobilization of glucose exceeds peripheral glucose uptake. This indicates that mechanisms other than feedback regulation to maintain euglycemia are involved in hormonal and substrate mobilization during intense exercise in humans.

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Crossref · 10.1152/jappl.1991.71.2.552

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  • Blood glucose concentrations exhibit a disproportionate increase at the onset of exercise as a result of a rise in blood glucose production from the liver that relatively exceeds glucose uptake.

    “With regards to feedforward mechanisms, it was reported that blood glucose concentrations exhibit a disproportionate increase at the onset of exercise as a result of a rise in blood glucose production from the liver that relatively exceeds glucose uptake [117].”

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Authors
Kjaer, M., Kiens, B., Hargreaves, M., & Richter, E. A.
Affiliations
  • August Krogh Institute, University of Copenhagen, Denmark.
  • University of Copenhagen (DK)
Venue
Journal of Applied Physiology
Published
1991-08-01
Volume
71
Issue
2
Pages
552-557
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2287355722
Cited by
111
References
0
Citations by year
2026: 2 · 2025: 3 · 2024: 1 · 2023: 5 · 2022: 3 · 2021: 1 · 2020: 6 · 2019: 2 · 2018: 2 · 2017: 3 · 2016: 4 · 2015: 2 · 2014: 1 · 2013: 6 · 2012: 2
FWCI
2.41
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
glucose homeostasis, muscle mass, physical activity, hepatic glucose production, peripheral glucose uptake, normoglycemia, plasma catecholamines, arm cranking, lactate, glycogenolysis, glucose mobilization, high-intensity exercise
MeSH terms
Adult, Arm, Blood Glucose, Catecholamines, Fatty Acids, Nonesterified, Glucose, Glycerol, Homeostasis, Hormones, Humans, Insulin, Leg, Liver, Male, Muscles, Organ Size, Oxygen Consumption, Regional Blood Flow, Exercise

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