Abstract
WHILE testing the hypothesis that exercise increases the rate of renewal of thyroidal iodine in the rat we found that the total amount of iodine in the thyroid gland depends on activity (exercise). Usually a month or more is necessary1 to replace completely the iodine in the thyroid gland so that the total can be estimated by the technique of isotopic equilibrium2,3, and we assumed that if rats were exercising the increased expenditure of calories would be associated with an increased utilization of dietary iodine for the production of thyroid hormone, which would in turn lead to an increased turnover of iodine in the thyroid and a decreased isotopic equilibration period. The experimental results did not confirm this, but they did reveal that the exercising rats stored only about half as much iodine in the thyroid as did the non-exercising controls.
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RHODES, B. Effect of Exercise on the Thyroid Gland. Nature 216, 917–918 (1967). https://doi.org/10.1038/216917a0
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DOI: https://doi.org/10.1038/216917a0
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