What's with the cotton wool in the nostrils?

The first time I saw this was on the TV show about Chris Boardman establishing the athlete's hour. Then again, at the Olympics: does anyone know why some cyclists put cotton wool or some such into their nostrils, effectively blocking their noses, while they warmup or train on stationary bikes on rollers/turbo? Do any of you do it?
Curious,
Rick
Curious,
Rick
0
Posts