Thyroid response to blocking sympathetic activity in chronic cold exposed hunters in East Greenland: a case-control study.

TSH showed an increasing trend during the first five days of intervention ( P = 0.005) with a rise from 2.04 mIU/L, a peak at 4.42 on day-5, followed by a decrease to 3.19 mIU/L.

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Interestingly, the higher thyroid activity associated with a slightly lower fT3 among hunters compared to controls, as fT3 showed a decreasing trend in parallel with the reduced thyroid activity during intervention.

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