Mild equine asthma can distinguish winners from losers on the racetrack
(PHYSorg.com Biology)

From chariot racing in ancient Rome to the modern Kentucky Derby, horse racing has been celebrated in some form for more than a thousand years. Whether the horses` hooves were pounding around in a dirt-filled coliseum or a racetrack surrounded by spectators in wide-brimmed hats, they probably had one thing in common: asthma.