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Environmental influences on hypothalamic-pituitary-thyroid function and behavior in Antarctica.

Lawrence A Palinkas1, Kathleen R Reedy, Marc Shepanek

  • 1School of Social Work, University of Southern California, 669 W. 34th Street, Los Angeles CA, 90089-0411, USA. palinkas@usc.edu

Physiology & Behavior
|July 14, 2007
PubMed
Summary

Antarctic residents at the extreme South Pole station showed enhanced physiological and cognitive performance compared to McMurdo. These adaptations, including higher thyroid hormones and lower body mass index, suggest effective responses to severe environments.

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Area of Science:

  • Environmental Physiology
  • Human Adaptation
  • Extreme Environments

Background:

  • Antarctica presents unique challenges including extreme cold and high altitude.
  • Understanding human physiological and psychological responses to these environments is crucial for personnel well-being and performance.

Purpose of the Study:

  • To compare physiological and psychological differences between individuals stationed at McMurdo and South Pole, Antarctica.
  • To investigate the impact of environmental severity on human health and cognitive function.

Main Methods:

  • Collected physiological data (BMI, blood pressure, temperature, hormones, lipids) and cognitive performance data (ANAM-ICE) from 185 participants across seasons.
  • Compared data between McMurdo (coastal) and South Pole (high altitude, extreme cold) stations.

Main Results:

  • South Pole residents exhibited lower BMI, body temperature, and higher norepinephrine levels.
  • South Pole residents showed elevated thyroid hormones (T3, T4) and lower triglycerides and cortisol during summer.
  • South Pole residents demonstrated improved cognitive task accuracy and efficiency in both summer and winter.

Conclusions:

  • Higher thyroid hormone levels and lower BMI at the South Pole may indicate adaptive metabolic responses to extreme cold and altitude.
  • These physiological changes did not adversely affect mood or cognitive performance.
  • Human adaptation to severe Antarctic environments is robust and can enhance cognitive function.