In addition, since isometric exercises are done in a static position, they won't help improve speed or athletic performance. They can be useful, however, in enhancing stabilization â maintaining the position of the affected area â since muscles often contract isometrically to aid in stabilization.
Etiology. Most (85-95%) substernal thyroid masses represent benign goiter. Historically, goiters have generally occurred because of iodine deficiency, although this is now observed primarily in developing nations.
Subclinical hypothyroidism is a term that refers to abnormally low thyroid function when TSH (thyroid-stimulating hormone) is slightly high or almost high, but blood levels of thyroid hormones are normal. Up to 8% of the general population has subclinical hypothyroidism.