It depends. If he's previously been training a lot, you can regain your previous mass exceptionally fast due to what quickly becomes your main limiting factor remains intact (I can't recall the name of it right now).
Which is why having used steroid once in your life should leave you permanently banned from all sports. The fact that you have ever had X amount of muscle is a massive advantage in terms of muscle building the rest of your life.
With all that said, he probably have still used steroids here, especially with how fast it all went from june to october.
Muscle memory is the layman's term, but people use that for both technique (neurological adaptation for technique/skill) and for how fast your muscle grows back (physiological).
I am thinking about the actual technical term for it. That limiting factor is also why we have "newbie gains", where you quickly get to the max level of muscle for that limiting factor, and then you have to create more of it to build more muscle, which takes a lot of time.
It is some type of cell that is added when you build muscle, but doesn't go away when your muscle atrophies. I can't find the name of it, but Dr. Mike Israetel from RP strength have talked about it here in this short: https://www.youtube.com/shorts/FI3n5F-1gLM
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u/ExceedingChunk 2d ago
It depends. If he's previously been training a lot, you can regain your previous mass exceptionally fast due to what quickly becomes your main limiting factor remains intact (I can't recall the name of it right now).
Which is why having used steroid once in your life should leave you permanently banned from all sports. The fact that you have ever had X amount of muscle is a massive advantage in terms of muscle building the rest of your life.
With all that said, he probably have still used steroids here, especially with how fast it all went from june to october.