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Although it is standard practice to replace fluid and electrolytes lost during vigorous exercise, replacement requirements seldom exist for minerals such as iodine. Iodine is an essential component for the production of thyroid hormones; hence, inadequate dietary intake leads to diminished thyroid hormone levels. On the basis of the published sweat...
Most of the daily dietary iodine intake (approximately 90 %) will be excreted in the urine; measurement of urinary iodine excretion is thus routinely used as an index of dietary iodine intake. However, urinary excretion is not the only means of iodine loss. Subjects such as athletes or those participating in vigorous exercise can lose a considerabl...