Must have been 20 years ago I read in Velonews something that said researchers had noted something like 15-20% increases in the mass of liver and kidneys in Tour riders. No idea how that was determined or if it was ever replicated. But assuming that was correct what caused the increase in mass? Neovascularization, increased nephrons/hepatocytes? combination?
I assume new blood vessels would be most likely but the change in mass seemed to be too large for that to be the only response.
I assume new blood vessels would be most likely but the change in mass seemed to be too large for that to be the only response.