Abstract
1. Four men, of ages varying from 23 to 28 years, living at Halley Bay, Antarctica (75° 31′ S, 26° 39′ W), were exposed to a mean air temperature of 6·6° C.
2. The concentration of serum triiodothyronine (T3) rose significantly by the second day, remained raised, and returned to pre-exposure levels within 2 days of return to a normal environment.
3. The concentration of serum thyroxine (T4) rose more slowly than did the T3, reaching a maximum in 3-4 days and also returning to normal within 2 days of return to a normal environment.
4. There was a wide individual variation in the change of concentration of serum cortisol.
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Selected References
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