I've heard that NASCAR drivers use catheters during a race. Is this true?

Get Real!

no they do not most of their fluids are lost through sweat during the race

No, they're problem is getting enough water into their bodies during a race, not the opposite.

no they get them selfs ready by first using the bathroom and watching what they eat and drink within i think they said 3 days of a race.

That's the most ridiculous thing I have ever heard! The answer is no! By no means do they wear such a thing! How would you like to drive for 500 miles with something stuck up there?! But seriously, they do not "wear" this! Good question though! A lot of people would probably wonder this too!

No. If they really have to go, they just go. Most races are under four hours and they can hold it. They also sweat a lot of the fluids out of their bodies.

Probably not. I'm sure they go before the race and besides, the races aren't THAT long. Remember, they sweat a lot too.

I don't think so. Many of the races these guys will loose ten-15 pounds from the tremendous heat. Haven't you seen where bottles of water or Gatorade are passed to them during a pit stop?

Nope, they don't use that. If they have to go they go, but most of the fluids in their bodies are just sweated right on out.