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Related Experiment Videos

Postexercise dose-response relationship between plasma glucose and insulin secretion.

K J Mikines1, P A Farrell, B Sonne

  • 1Department of Medical Physiology B, Panum Institute, University of Copenhagen, Denmark.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 1, 1988
PubMed
Summary

Exercise does not alter the human beta-cell response to glucose stimulation. Beta-cell secretion increases linearly with hyperglycemia, demonstrating a large secretory capacity unaffected by a single bout of exercise.

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Area of Science:

  • Endocrinology
  • Metabolic Physiology
  • Human Physiology

Background:

  • Understanding beta-cell function is crucial for managing glucose homeostasis.
  • The impact of physical exertion on beta-cell reactivity requires further investigation.

Purpose of the Study:

  • To determine if physical exertion affects beta-cell responsiveness to glucose.
  • To characterize the human beta-cell response to varying glucose levels.

Main Methods:

  • Sequential hyperglycemic clamps (7-35 mM) were used to stimulate beta-cells.
  • Hormone and metabolite levels, metabolic rate, and substrate utilization were measured.
  • Studies were conducted pre-exercise and at 2 and 48 hours post-exercise (60 min at 150 W).

Main Results:

Related Experiment Videos

  • Insulin secretion increased progressively with glucose levels.
  • Linear relationships were observed between glucose and C-peptide/proinsulin.
  • Glucose oxidation, norepinephrine, O2 uptake, and beta-hydroxybutyrate increased with higher glucose concentrations.
  • A single bout of exercise did not alter beta-cell response or glucose-induced thermogenesis.

Conclusions:

  • Human beta-cells possess a substantial secretory potential, with secretion linearly related to hyperglycemia.
  • Proinsulin processing remains unchanged during sustained beta-cell stimulation.
  • Exercise does not modify beta-cell response to glucose or glucose-induced thermogenesis.