By Eve Van Cauter (auth.), E. van Cauter Ph. D., G. Copinschi M.D., Ph. D. (eds.)
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Additional resources for Human Pituitary Hormones: Circadian and episodic variations
There is an increase of the PRL plasma concentration during the night, and this is sleep-dependent. Highest concentrations are often reached towards the end of the night (5, 39). In our rhesus monkeysas well, PRL is often secreted in bursts. However, during long periods of time, there are only low-amplitude oscillations of the plasma PRL concentration which are within the limits of accuracy of 53 rh GH ng Eq ml II I I' E. 77 sleep-deprivation 10 E 28 . 7 . 77 undisturbed 10 III 10 I IIII' [I I I E.
6. te m~~~ng ~ample~. t~g ~leep dephivalion (the ep~o~Q eXQ~ ~on~ 06 plMma TSH ane highen ~n monkey O. on the day~ 06 nap and ~leep dephivation than d~ng un~tunb e d ~on ~o~). 78 d~ng the eanly mOJtMng ho~. ~n 2 monkey~ bility of the TSH secretory pattern remains unexplained at the present time. Evaluation of the data showed no consis- tent influence of the time of the year (although the number of experiments in each season is too small for the application of statistical tests of significance).
Then secretory episodes occur fairly but not absolutely regularly with a tendency to higher maximal GH plasma concentrations towards the evening. The episodes occur with less regularity during the night, and lower absolute concentrations are often found during the early morning hours (still in darkness). In individual animals there is a certain re- producibility of the pattern from day to day, but sometimes, and without any apparent reason, a quite dissimilar pattern may be found as to frequency and height of the secretory spikes.
Human Pituitary Hormones: Circadian and episodic variations by Eve Van Cauter (auth.), E. van Cauter Ph. D., G. Copinschi M.D., Ph. D. (eds.)