Based on this it would appear that calorie restriction seems to negativly impact the performance of the enzyme responsible for converting T4 to T3. It is possible that this could be due to the absence of dietary componet in the CR group that reduced the bodies ability to manufacture the enzyme as there was no comment made as to dietary modification between the two groups.
It is also a rather small 'n' number in an older population, so it's difficult to extapolate the results to younger trained athletes. An interesting study none the less, but one that should spur further research rather then provide evidence for conclusions and influence training, nutrition and supplementation.
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