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.
The adrenal (or suprarenal) glands are paired retroperitoneal (lying posterior to the peritoneum) endocrine glands situated over the medial aspects of the upper poles of each kidney. They secrete steroid and catecholamine hormones directly into the blood.