Thats interesting, i know massages also rush water to your muscles, giving you an extra pump. I had 2 ex's that were massage therapists and they always preached u mustdri k at least 2 cups of water after to avoid dehydration.very short on time...
Anecdotal, when I was younger (the 80's) I had an insanely intense deep massage session, lasted about an hour and a half, crazy amounts of what i think we would call fascia planing today, top to bottom, I sweated heavily for about 4 hours after it was done.
It fucking blew me up literally over night. As far as stuff that could be measured the next morning my calves were a half inch bigger and my arms gained just over an inch 17.xx to 18.xx.
I loved it but could hardly move, this dude had made big promises and he backed it up. I assumed this was from better blood flow and inflammation and it would fade away in a day or two.
I was wrong, it never went away, never got smaller than that until I got married and quit training for a few years.
So I don't know exactly what to believe on this one, IOW exactly what happened or does happen, but that's my experience.
Man i miss daily massages, i got em for the better part of ten years basically everyday... now its been 6 months with nothing, was thinking of getting one but 100$?!?!.....dont realise what u got till its gone lol