Serial lactate measures also help assess response to therapy. The half-life of lactate is around 20 minutes, even in septic patients. If the lactate is persistently elevated, it's not because the body can't get rid of it, but because the body continues producing it, shifting to anaerobic metabolism.
That's because the Philadelphia Rock 'n' Roll Half Marathon, which has been run in the city for 38 years, has a new date for 2015, landing on Oct. 31.
This race takes place in June in Queens, New York. Runners compete for 18 hours a day, running around a city block that measures half a mile. They run until they complete 3,100 miles. The record of 41 days and 8 hours is held by German instrument maker Madhupran Wolfgang Schwerk. He set the mark in 2006.