Originally Posted by
Dellphinus
It's an illusion, like hair growing after you die- only looks that way because after death the body dehydrates, and the skin shrinks back, but whiskers, nails and hair don't, giving the illusion of growth.
When riding, the wind pushes your facial skin back, stretching it taught, and making the whiskers stick out more, giving the illusion of growth. Slow down, man!
Seriously, I've often wondered the same thing- beard seems heavier day after a good ride/training session.
Darn, thought the OP was on to something. Could start a Rogaine style bike company. Just think how many bikes you could sell if you could claim that cycling made your hair grow!!!!