Testosterone secretion is stimulated by gonadotropin releasing hormone
(GnRH) secreted by the hypothalamus. Once the GnRH is in the
bloodstream how soon is testosterone secretion increased? How soon
after the GnRH peak does testosterone level in the blood peak? What is
te halflife of testosterone in the blood? What substance does the body
produce that actually inhibits gonadotropin releasng hormone release
through the mechanism of feedback inhibition? At what rate does the
level of testosterone in the blood decrease as the level of GnRH
decreases? How long after testosterone reaches its lowest serum level
does the secretion of GnRH from the hypothalamus  begin to rise?

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Request for Question Clarification by synarchy-ga on 19 May 2003 16:59 PDT

Hi - I've found references that answer your question, but they are
only available in print (they date from the late '70's, early 80's) -
will an answer containing these references be sufficient?

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Clarification of Question by richard1022-ga on 19 May 2003 18:52 PDT

Yes.

Hey richard, what about medline..... 
it is not my job but try for example
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=6770718&dopt=Abstract