The Effect of Acute and Chronic Exercise on Thyroid Hormones in Obesity

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Abstract
Thyroid hormones were measured before, during and after acute exercise (60 min) or physical training (3 mo) in obese women. TSH concentration increased during acute work and decreased immediately after. No changes were seen during the 3 following days. An increase was seen after 10 days as well as after 3 months of physical training. Thyroxine concentrations showed no changes. 3,5,3''-Triiodothyronine decreased slightly immediately after acute exercise, and after 3 mo. of physical training 3,3'',5''-triiodothyronine (reverse triiodothyronine) increased slowly during and after acute exercise. A negative correlation was found between changes in fasting insulin and thyroxine and a positive correlation between changes in blood pressure and triiodothyronine after training.