Copypasta from that thread:
We all know about the "short pump" after lifting where your muscles are engorged and hard and you wish you looked like that all the time. This goes away after maybe half an hour and you (I) can go back to hating yourself and feeling inadequate.broseph wrote: ↑Fri Oct 28, 2022 6:37 am ... I believe in a phenomenon I call "the long pump." It's not something I've seen discussed, but I think there's an increase in "visible muscle tone" when a muscle is worked regularly.
I refuse to believe my apparent total body deflation after a couple weeks of not lifting is all in my head. The long pump also explains how certain exercises can have apparent immediate effects on the physique- snatch grip high pulls come to mind.
Similarly, I seem to have better ab definition when I'm regularly "doing abs." I don't even need much volume or frequency, and I don't need to push progressive overload. Just getting a few sets twice a week gives me the long pump needed for my 4 pack.
I'm proposing the idea of a "long pump" that lasts 7-14 days (very large margin of error on this estimate), but takes a couple sessions (usually) to get going. As stated in the quoted post, I think this is most obvious when we stop lifting for a week or two, regardless of caloric intake, and we (I) seem to deflate. It is also obvious when a new lift is added, especially in the situation of a "seasoned lifter" who has neglected certain muscle groups. Anecdotally, I've seen this in my arms, traps, abs, and calves.
There was an article on T-Nation a while ago where they talked about Snatch Grip High Pulls, and how people report noticeable changes in their physiques after a few, or even a single session. I swear a few of us on the forum tried this movement and saw results (hopefully they see this thread and chime in). I think the max effort contraction of the upper back musculature is waking up a long pump, and bigger upper back = obviously swole, even in a shirt.
I don't think I've actually gained proteinaceous muscles mass in a week, yet everything looks bigger all the time. I don't know if this is a short term increase in intramuscular energy substrate and water, or an increase in muscle tone, or both, or neither, or maybe it's all in my head and I'm holding my posture differently now that I've been made more aware of the newly trained muscle groups, who knows. But it sure seems like a thing.
Additional support for this phenomenon is that while sitting on the couch at night, I can flex whatever muscles I've been working lately (pec pops, the individual members of the quadriceps group, calves vs soleus, etc). I'm definitely less able to pec pop when I haven't lifted in a while.
Do others have experience with this occurrence or am I crazy?