- Researchers explain why Sherpas are so good at dealing with extreme altitude
- Xtreme Everest expedition tested Sherpa physiology
- Sherpas are more efficient at using oxygen and have improved blood flow in their organs
Vital Signs is a monthly program bringing viewers health stories from around the world.
(CNN)Mount Everest is the ultimate test for adventurers trying to test their boundaries, but when it comes to climbing this natural monument, one group of people excel -- Sherpas.