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.
Enlarged thyroid glands (ie, goiters) often extend in the mediastinum posterior to the sternum, making the gland, by definition, a substernal (or retrosternal) goiter.When this occurs, thyroidectomy surgery (excision of part or all of the thyroid gland) has unique considerations that are important to understand for the surgeon and patient.