Very interesting account, makes you wonder what the transition they go through is like, going from zero gravity to normal gravity straight away seems crazy. The body is quite good at adapting to its environment if given time to do so.

I would have assumed that they would go through some sort of transitional period similar to how a scuba diver doesn't surface to quickly.

The stress on the body would be enormous especially the heart which has gotten use to easily pumping blood around the body with no gravity to now having to work much much harder to get this done.