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Related Concept Videos

Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...

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Application of Chronic Stimulation to Study Contractile Activity-induced Rat Skeletal Muscle Phenotypic Adaptations
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Exercise intensity and its effects on thyroid hormones.

Figen Ciloglu1, Ismail Peker, Aysel Pehlivan

  • 1GENLAB Medical Diagnostics and Research Laboratory, Istanbul, Turkey.

Neuro Endocrinology Letters
|December 29, 2005
PubMed
Summary

Acute aerobic exercise significantly impacts thyroid hormone levels, with moderate intensity exercise causing the most changes. High intensity exercise further alters thyroxine and TSH, while triiodothyronine levels decrease.

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Area of Science:

  • Exercise Physiology
  • Endocrinology

Background:

  • Physical activity impacts energy metabolism and resting metabolic rate.
  • The effect of exercise on thyroid hormones is not fully understood.
  • This study investigates acute aerobic exercise's impact on thyroid hormones.

Purpose of the Study:

  • To examine how different intensities of aerobic exercise affect thyroid hormone levels.
  • To determine the relationship between exercise intensity, lactate levels, and thyroid hormone concentrations.

Main Methods:

  • 60 male athletes performed bicycle ergometry at low (45%), moderate (70%), and high (90%) intensity based on maximum heart rate.
  • Measurements included heart rate, blood lactate, serum total thyroxine (T4), free thyroxine (fT4), total triiodothyronine (T3), free triiodothyronine (fT3), and thyroid stimulating hormone (TSH).

Main Results:

  • Moderate intensity exercise (70% MHR, anaerobic threshold) induced the most significant hormonal changes.
  • At high intensity (90% MHR), T4, fT4, and TSH levels continued to increase.
  • T3 and fT3 levels began to decrease at high intensity exercise.

Conclusions:

  • Maximal aerobic exercise significantly influences circulating thyroid hormone levels.
  • Exercise intensity is a critical factor in determining the magnitude and direction of thyroid hormone response.