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- W2141347906 abstract "Humans who work in Antarctica display deficits in cognition, disturbances in mood, increased energy requirements, a decline of thyroid hormone products, and an increase of serum TSH. We compared measurements in 12 subjects, before deployment (baseline), with 11 monthly studies during Antarctic residence (AR). After 4 months of AR (period 1), half of the subjects (T4 group) received l-thyroxine [64 nmol·day−1 (0.05 mg·day−1)]; and the other half, a placebo (placebo group) for the next 7 months of AR (period 2). During period 1, there was a 12.3 ± 5.1% (P< 0.03) decline on the matching-to-sample (M-t-S) cognitive task and an increase in depressive symptoms, compared with baseline. During the intervention in period 2, M-t-S scores for the T4-treated group returned to baseline values; whereas the placebo group, in contrast, showed a reduced M-t-S score (11.2 ± 1.3%; P < 0.0003) and serum free T4 (5.9 ± 2.4%; P < 0.02), compared with baseline. The change in M-t-S score was correlated with the change in free T4 (P < 0.0003) during both periods, and increases in serum TSH preceded worsening scores in depression, tension, anger, lack of vigor, and total mood disturbance (P < 0.001) during period 2. Additionally, the submaximal work rate for a fixed O2 use decreased 22.5± 4.9% in period 1 and remained below baseline in period 2 (25.2± 2.3%; P < 0.005) for both groups. After 4 months of AR, the l-thyroxine supplement was associated with improved cognition, which seems related to circulating T4. Submaximal exercise performance decrements, observed during AR, were not changed with this l-thyroxine dose." @default.
- W2141347906 created "2016-06-24" @default.
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- W2141347906 date "2001-01-01" @default.
- W2141347906 modified "2023-10-16" @default.
- W2141347906 title "Impairment in Cognitive and Exercise Performance during Prolonged Antarctic Residence: Effect of Thyroxine Supplementation in the Polar Triiodothyronine Syndrome<sup>1</sup>" @default.
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- W2141347906 doi "https://doi.org/10.1210/jcem.86.1.7092" @default.
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