The New York Times ran an article on Team Type 1, which was an 8-person team made up of cyclists who have Type 1 Diabetes. Here's an excerpt from that article:

"During the Race Across America, the Team Type 1 cyclists wore glucose monitors and traveled with a doctor, eating or drinking when blood sugar levels begin to drop. While all the athletes must take insulin regularly to prevent high blood sugar, the intense exercise causes their medication needs to drop 60 to 75 percent during the first days of the race. As the body adjusts in the later days of the race, the cyclists must generally increase their insulin injections.

To complete the race, the cyclists divided into two teams of four. The first four riders took turns pedaling at full sprint for 10 to 15 minutes at a time, meaning each individual rider took only a short break before having to ride again. After about 150 miles of tag-team racing, the exhausted cyclists met up with the second set of four riders, who took over, giving the first riders time to eat and rest before they started again.

Despite mechanical problems, the team, which started in Oceanside, Calif., rolled into Annapolis, Md., a distance of 3,021 miles, in five days, nine hours and five minutes. Their average speed was 23.41 miles per hour — 0.17 better than the winner last year, a Norwegian cycling team made up of professionals."