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Peripheral glucose metabolism in human hyperthyroidism.

M C Foss1, G M Paccola, M J Saad

  • 1Department of Medicine, School of Medicine of Ribeirão Preto, São Paulo University, Brazil.

The Journal of Clinical Endocrinology and Metabolism
|April 1, 1990
PubMed
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Hyperthyroidism significantly increases forearm muscle glucose uptake and oxidation in humans. This effect is observed both in a fasting state and after consuming glucose, indicating altered glucose metabolism.

Area of Science:

  • Endocrinology
  • Metabolic Research
  • Human Physiology

Background:

  • Hyperthyroidism is a condition characterized by excessive thyroid hormone production.
  • Thyroid hormones play a crucial role in regulating metabolism.
  • The impact of hyperthyroidism on peripheral glucose metabolism requires further elucidation.

Purpose of the Study:

  • To investigate the effect of spontaneous hyperthyroidism on forearm muscle glucose uptake and oxidation.
  • To analyze glucose metabolism during both postabsorptive and postprandial states.
  • To compare glucose metabolism in hyperthyroid patients versus normal individuals.

Main Methods:

  • Utilized the forearm technique to measure substrate exchange in forearm muscles.
  • Combined forearm analysis with indirect calorimetry to assess peripheral glucose metabolism.

Related Experiment Videos

  • Studied ten normal subjects and eleven hyperthyroid patients over a 3-hour period after a 75g oral glucose challenge.

    • Main Results:

    • Hyperthyroid patients exhibited significantly increased forearm glucose uptake (1286 vs. 677 mumol/100 mL forearm/3h) and oxidation (443 vs. 147 mumol/100 mL forearm/3h).
    • Nonoxidative glucose metabolism was also elevated in hyperthyroid individuals (842 vs. 529 mumol/100 mL forearm/3h).
    • Elevated basal free fatty acid (FFA) levels and lipid oxidation rates were observed in hyperthyroid patients, which normalized after glucose ingestion.

    Conclusions:

    • Spontaneous human hyperthyroidism enhances glucose uptake by forearm muscles.
    • Augmented glucose fluxes occur through both oxidative and nonoxidative pathways in hyperthyroid individuals.
    • These findings highlight significant alterations in peripheral glucose metabolism during hyperthyroidism.