看看这篇：

What does it take to make a big race run? A lot of doctors

STORY HIGHLIGHTS
 
In the early days of the Boston Marathon, doctors listened to each racer's heart
 
Now the race, April 19, has 1,000 medical professionals at the finish line alone
 
Cardiologist and marathoner urges runners to train and have heart checked

http://articles.cnn.com/2010-04-19/health/marathon.medical_1_marathon-runners-chicago-marathon-jeff-galloway?_s=PM:HEALTH