[quote] JJ wrote:
the thing is… Supraphysiological androgen levels have been shown to reduce the number of receptors there are… making your body almost ‘resistant’ to testosterone - whether that is yours or bottled gear.
This is the reason why ever larger doses are needed (although many take this much too far IMO jumping 500mg from one cycle to the next).
Theoretically, if you abuse steroids for any period of time (abuse - supraphysiological doses - again JMO), you should become ‘de-sensitised’ to testosterone to some unknown degree.
In reality, a few moderate cycles wont make THAT much difference as there are many other factors involved in muscle growth.
(I read something once where a rat had been ‘de-testicled’ and given shocks in a particular muscle forcing contraction - there was growth!)
I for some reason never lose muscle tissue like others seem to when i have next to no testosterone production…
Plus i can say that after my first couple of bullshit cycles of Diannaballs, i managed to do fairly well over the following 5/6 years au naturel.
Does this help?
In summary, there is some truth to that rumour, but is isnt quite as cut and dried as that - when is it? 
JJ[/quote]
I use to think the same thing about androgen receptors and AAS use. Then someone corrected me and it sent me to the literature. I found that androgens actually increase the number of AR in muscle tissue. I had been looking at other tissues.
Still, those studies, from what I can recall, were short. I don’t know what might happen on long exposure of ultra high supraphysiologic levels. I still think they drop over time but can’t find any research that looks over the time period of a typical AAS cycle.
After cessation of the AAS use, given a long enough abstinence period I would think the whole system normalizes though just like with other drugs. I stopped AAS use for nearly 10 years and made gains in arms and legs. My squat especially improved. So, it is possible to improve after AAS use is discontinued.
The receptor bit, I am still not certain about. However, it does seem that they increase on administration, at least initially. Look at the review below on page 25 bottom of first column into the second column.
Journal of Endocrinology (2005) 186, 21�??31