Originally Posted by Iguana
Well. I believe both are correct. I think one thing most guys overlook is the fact that the penis in not just made up of one tissue type. The composition of the tunica and fascia is substantially different than that of the cavernous/vascular smooth muscle it encompasses. It’s only natural they would respond differently to mechanical stress. Studies show that ligaments, which are similar in composition to the tunica, are sometimes subject to plastic deformation as a result of strain. Not that cell proliferation does not occur in connective tissue; I have found articles that suggest that this does indeed occur. But the majority of articles I have read point to elastic/plastic deformation. Probably because most are in reference to connective tissue injuries. There is much less infomation pertaining to the growth of connective tissue as a result of mechanical stress.
I’m inclined to belive that long term sustained stretch would be likely to produce connective tissue growth while short term intense stretch would more likely induce some type of deformation.
Connective Tissue Elastic and Plastic Deformation
Connective Tissue Growth
As for smooth muscle:
… just my two cents.
I want to chime in. I think the exact opposite of what Iguana said. It’s pretty humorist: I’m sure Iguana has read the some (or more likely far more) amount of studies that I have read on this subject; also, just to make it clear, I think he has a far more stronger scientific background than I have. So, two not uninformed people on this subject seem to have radical different point of views about :) ; this just means, in my opinion, that we really know very little on how the CT grows.
So said, I think that heavy loads, so heavy to pull above the stress-strain curve, are the cause of the new CT production; given that CT is made of cells, heavy loads gains are based on cellular growth. I think that, speaking of connective tissue, we always have to remember that we are speaking of living tissue.
Plastic deformation in an in-animated thing is a new length without new matter; plastic deformation in the case of a tendon (or ligament or tunica albuginea) is an injury : if you have a real strain to your shoulder tendon you can’t move it: it was pulled too much. When you heal from this injury, you’ll have more stuff in your tendon, as a result of inflammation and repairing; a lot of this new stuff is scar tissue, that has to maturate and has to be pulled to a longer state: if you don’t pull on the tendon to elongate it, the tendon will be shorter, not longer - despite the cellular proliferation.
If you pull with an heavy load, but slightly less then the max strain point, you’ll damage a very light amount of CT; you have a plastic deformation, without new matter, because a little amount of elastic tissue was broken; once this broken tissue will be repaired, you’ ll have a longer CT because the cellular growth, but this isn’t plastic deformation, because plastic deformation is a change in the length of a given body without augmenting the amount of physical mass in that body.
In the last, the true plastic deformation can happens with low, prolonged loads. You’ll have creeps in the tissue, but at a so slow rate that in the body there is never a real injury nor a micro-injury : so, the CT isn’t broken, so there isn’t an high total amount of cellular growth (nor in number, neither in size). The tissue just looses it’s elasticity, and get adapted to a new, longer shape.