I don't know the answer. I tend to think, however, (just an opinion), the pressure on them is less than it is here in the USA... for a number reasons.
I remember watching the olympics with a foreign exchange student from Norway... then via phone/email with a foreign exchange student of ours from Switzerland, and yet again with another foreign exchange student we had from Japan.... 'winning' for them wasn't 'expected', it was a bonus. The mere act of competing, win or not, was lauded.
I don't think that holds "AS" true here in the USA... especially for the best of our Athletes.