Cyclic Fluctuations in I-131 Content of Thyroid Glands of Cats and Monkeys

Woods J.W., Wayt H.J. and Baker H.J.

Proc Soc Exp Biol Med, 1966. 122(1): p.211-4.

Diurnal cycles have been reported in various pituitary-target organ relationships. Evidence that the thyroid may be affected by such rhythms comes from the work of Walfish rl al (2) who described cycles in the rate of degradation of exogenous thyroxin in humans, from that of Auerbach (3) who found similar variations in serum protein bound iodide and from the recent report by Bakke and Lawrence (1) that a circadian rhythm was observed in pituitary and serum concentration of thyroid stimulating hormone (TSH) in the rat.