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.
Sub-Sternal Thyroids and Goiters. Thyroids which grow into the chest to cause problems. Please read the page on thyroid goiters before you read this page. It will make it easier to understand. The normal thyroid gland resides in the neck, with both lobes wrapping gently around the trachea (breathing tube). When thyroids get enlarged (called a goiter), they can grow a number of different directions. Usually, they will grow within the neck as shown in the picture of the woman on our goiter page.