I doubt brain volume shrinkage in itself is alarming - it could well be a physical effect from the shaking or something akin to dehydration (I know the brain is

I doubt brain volume shrinkage in itself is alarming - it could well be a physical effect from the shaking or something akin to dehydration (I know the brain is suspended in liquor). Assessing the cognitive capabilities before and after would be more interesting, but of course much more complicated. Also: 1000+km runs, my god...