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Thyroid function during intermittent exposure to hypobaric hypoxia.

R C Sawhney1, A S Malhotra

  • 1Defence Institute of Physiology and Allied Sciences, Delhi Cantt, India.

International Journal of Biometeorology
|December 1, 1990
PubMed
Summary
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Intermittent hypobaric hypoxia significantly lowers thyroid hormones triiodothyronine (T3) and thyroxine (T4) in rabbits. This suggests an adaptive response to reduced oxygen availability during prolonged exposure.

Area of Science:

  • Endocrinology
  • Physiology
  • Environmental Medicine

Background:

  • Thyroid hormones triiodothyronine (T3) and thyroxine (T4) are crucial for regulating metabolism.
  • Hypobaric hypoxia, simulating high-altitude conditions, can impact physiological processes.
  • The effects of chronic intermittent hypobaric hypoxia on thyroid hormone kinetics are not fully understood.

Purpose of the Study:

  • To investigate the impact of intermittent hypobaric hypoxia on circulatory levels and kinetics of T3 and T4 in rabbits.
  • To determine if hypoxic stress induces adaptive changes in thyroid hormone metabolism.

Main Methods:

  • Rabbits were exposed to intermittent hypobaric hypoxia (5200 m) for 6 hours daily over 5 weeks.
  • Circulatory T3 and T4 levels were measured at various time points.

Related Experiment Videos

  • Thyroid hormone kinetics, including metabolic clearance rate and production rate, were assessed.

    • Main Results:

    • Significantly decreased T3 and T4 levels were observed from day 8 of hypoxic exposure, persisting throughout the study.
    • Metabolic clearance rate, production rate, distribution space, and extrathyroidal T3/T4 pools were significantly reduced under hypoxic stress.
    • Control animals did not exhibit these changes.

    Conclusions:

    • Intermittent hypobaric hypoxia leads to a significant reduction in circulating thyroid hormone levels and alters their metabolic kinetics in rabbits.
    • The observed decline in thyroid hormone levels and production represents an adaptive physiological response to chronic low oxygen availability.
    • These findings highlight the complex interplay between the endocrine system and adaptation to environmental stressors.