A runner’s joints aren’t the only parts of their body affected. Earlier analyses of the same runners revealed that their brains seemed to temporarily shrink in size by 6 per cent over the course of the race.
The loss may simply be the result of extreme fatigue and undernourishment, but Schütz thinks it could be caused by lack of stimulation. One of the four brain regions that seems to be particularly affected is known to be involved in visual processing. That area may have been massively under-stimulated by 64 days of viewing little other than roads, he says.
Others have suggested that athletes’ brains may reorganise themselves to divert energy to regions involved in motivation. “It is hard to explain what’s going on,” says Schütz. “But we do see total recovery after six months.”
Schütz says people who run normal marathons won’t experience the same degradation.
Aerobic exercise is generally beneficial for the brain, helping to stave off depression and dementia.
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So your brain shrinks, you crap yourself, your joints hurt, heat/sweat rash in all sorts of uncomfortable places… Yeah, I’m not gonna run a marathon any time soon.