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.
A simple goiter is an enlargement of the thyroid gland. It is usually not a tumor or cancer. The thyroid gland is an important organ of the endocrine system. It is located at the front of the neck just above where your collarbones meet.