I just referred to this in a new comment I left, and it makes me want to bump this because I think it could be good conversation, but I tend to kill those sometimes, I think.
First I've felt like explaining several things about me: if you think that me giving proper sources with citations and everything makes me look smart and professional, I can assure you I am NOT that smart. All I am is a guy who did get a masters degree, but that was after my brain injury, so mostly I just learned how to improve my writing and also I bet many of you haven't written papers for school in a very long time. I discovered that nowadays there's always free programs like Zotero to easily save and cite sources, so all I have to do is like type a number to cite something.
One thing I do have a lot of experience and "skill" at is doing research. I say experience because I was one of those speech and debate nerds in high school obsessed with policy debate. And I say "skill" because all that means is I have access to databases in a school's library and I can type in search terms like, "penile implants" AND "vacuum erection device" OR "VED." Then, I read the results it gives. Not exactly a "skill," as I hope you can understand.
Anyway, about this post, I think PowerliftingDad got half the answer right, and crazyjoe got the second half.
Powerlifter is right because consistent exercise with the implant does help it get "broke in" allowing you to pump more. And Joe answered the rest by saying,
Cycling softens the tissues on the shaft allowing them to expand. It also softens the tubes allowing them to also expand. I would add that to enhance this lengthening process is to add the Perito exercise.
What's interesting is I think OP and Joe pretty much explained what the sources say, but the study gives way more details. And that's another thing, some don't give full credit to studies, but I think people should believe this literature is from real, reputable and trustworthy authorities who perform these studies for the purpose of improving medical treatment all around the world. Peer-reviewed medical research is not the same as stuff you find on google.
These are real doctors performing real acts of medicine and releasing their findings properly using the scientific method. If anyone didn't know these are real urologists...
The above study first cites Henry, G. D. This is him and his background:
Next is Carrion, R. This is him and his background:
Next I can't find a ton of information about Jennermann, C, but I found that it is Coline Jennermann who is an MS of Regional Urology at Shreveport, LA.
And this is the last one, Run Wang and his background:
I've read also that some people don't fully trust studies because some were funded by Boston Scientific or Coloplast, but I really don't think that takes away any credibility whatsoever. These are real medical findings. There's no way to fake them or alter them, at least not without losing your medical license. This study and many other report real findings of dick sizes before VED treatment and before implant. Then these doctors find real numbers after controlled exercises that work to increase size. It doesn't matter who paid for it, because how the numbers did change is all that matters. And then doctors write about why this works, and why we should believe that it's been proved effective time after time.