Check out this article. It's a few years old but the findings are pretty cool. Although muscles take a couple weeks to recover after Ironman they found that other physiological factors (blood pressure, heart rate, etc) are fully recovered only 3 days after the race. They also found that athletes with faster race times tend to recover faster than people with slower race times. The researchers were all surprised to find the faster-than-expected recovery times. They attribute this to our ancient ancestors that were on the move for up to 4 hours per day... essentially walking and/or running a long distance every day. My how things have changed!
http://www.the-aps.org/press/journal/06/6.htm
Damon
