i think that the body secretes hgh in pulses.. randomly but mostly around sleep and shit, when there is somatostatin in the blood hgh cannot be released.. but yes those figures look right..
I think there is more to it. hgh doesnt do much its self, i think there is alot that science simply doesnt know yet. like how a little 5 pound kid can grow to be 220 pounds naturally ( not ripped ofcourse.. ) no hgh in the world can do this... there is other stuff in the genetics i think, probably something that limits how much a human can grow... your avarage person can never be as big as those freaks on stage who are 250 lbs shredded.. with all the drugs..
The human body ( well every cell on earth ) is so intresting.. there is so many hormones , peptides, growth factors, receptors and messangers.. who knows..
like what influences height ? hgh therapy can only add an inch or two yet my main man is 6'4 since 16 and i have been 6'2 since 15.. i dont think hgh is even that important for growth, i think insulin is the culprit.. hgh just stops the fat loss by stopping the insulin receptors in fat cells yes ?
And yes it is a negative feedback loop... too much of any hormone will lead to it being stopped from producing.. i guess it can restart.. but by 30 + when most guys start using hgh they are getting lower levels of it anyway