MORPHOFUNCTIONAL CHANGES OF THE THYROID GLAND UNDER CONDITIONS OF EXPERIMENTAL HYPOTHYROID DYSFUNCTION AND PHYSICAL EXERTION

No significant changes of hormonal profile and structural features of the thyroid gland were detected under conditions of physical exertion. The influence of physical exertion against the ground of hypofunction of the thyroid gland causes deterioration of the thyroid status. The increase of the content of thyroid-stimulating hormone secreted by the anterior pituitary gland, decrease of the concentration of free thyroxin and thyroid index as compared to the similar indices of animals with hypothyroid dysfunction were found against the ground of histological changes in the structure of the thyroid gland.