Muscle strength in hyperthyroid patients before and after medical treatment

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Abstract
Summary. Ten hyperthyroid patients were assessed for muscle strength before and after a period of medical treatment that averaged 12 months. The subjects did not change their habitual level of physical activity between the two test occasions. Maximal voluntary isokinetic knee extensor muscle strength was determined during various concentric, eccentric and isometric conditions. Average increases in strength from before to termination of treatment ranged from 25 to 41% for the concentric and isometric tests (Pn= 10), and from 19 to 35% for the eccentric tests (Pn= 6). The present study demonstrates that medical treatment of hyperthyroid patients results in a marked increase in muscle strength.