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The relation between thyroid function and human regulatory nonshivering thermogenesis

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    Acta Anaesthesiologica Scandinavica
    |April 1, 1980
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    Thyrotoxicosis patients maintain normal thermoregulatory reserve, increasing oxygen consumption and non-esterified fatty acids (NEFA) during cold exposure. Hypothyroid patients show impaired fat mobilization despite increased oxygen consumption.

    Area of Science:

    • Endocrinology
    • Human Physiology
    • Thermogenesis

    Background:

    • Thyroid hormones play a crucial role in regulating metabolism and heat production.
    • Understanding thermoregulation in thyroid dysfunction is essential for clinical management.

    Purpose of the Study:

    • To investigate the chemical factors of non-muscular heat production in response to cold exposure in patients with thyrotoxicosis and hypothyroidism.
    • To assess the thermoregulatory reserve and fat mobilization in these patient groups.

    Main Methods:

    • Standardized cold air exposure with simultaneous vasodilation.
    • Measurement of oxygen consumption and plasma non-esterified fatty acids (NEFA) levels.
    • Assessment of thermoregulation before and after exogenous thyroxine administration in hypothyroid patients.

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    Main Results:

    • Hyperthyroid patients exhibited normal thermoregulatory reserve, significantly increasing oxygen consumption and plasma NEFA levels.
    • Hypothyroid patients increased oxygen consumption but showed inhibited fat mobilization, with no significant rise in plasma NEFA.
    • Exogenous thyroxine administration normalized thermoregulation and fat mobilization in hypothyroid patients.

    Conclusions:

    • Thyrotoxicosis does not impair thermoregulatory reserve related to fat metabolism.
    • Hypothyroidism is associated with impaired fat mobilization, a key component of thermogenesis.
    • Thyroid hormone replacement therapy can restore normal thermoregulation and fat mobilization patterns.