Since when are thyroid hormones indicators of overtraining? None of the research that I have been able to find has indicated that these hormones can serve as markers of overtraining syndrome (acute, severe/chronic, or otherwise). I understand that the research is extremely limited in this area, especially when it comes to observing the chronic overtraining effects. Even studies that attempted to study this only used a regime of a few months, I don't think that is enough.
However, in my experience these symptoms that the elites complain of when they are diagnosed with a "sluggish thyroid" are the symptoms of undereating and starvation. Now, training may obviously have a huge role in this - overtraining probably contributes significantly to the chronic calorie deficit that elicits these hypothyroid symptoms.
My question is - does anyone else think that Alberto strictly regulates these athletes' caloric intakes to maintain an optimal body weight? Then, when they begin to show the symptoms of starvation, they are put on a thyroid cocktail of drugs to maintain the lowest body weight of lean muscle mass? If one can reduce their weight as much as possible, relative VO2max will increase, but usually the tradeoff is that as you lose weight, you lose muscle mass as well and running economy decreases.
If these athletes can be as lean as possible without sacrificing muscle mass and running economy, performance will increase significantly. Anybody with more knowledge of the endocrine system have anything to contribute to these ideas?