One more Olympic thought

One other item that was in the mental draft of yesterday's Olympic pondering, but was inadvertantly dropped. Another possible genetically-driven edge in athletic performance would not be directly on performance but on the reaction to performance. Prime athletes might have different pain or endorphin responses, less post-exercise inflammation, different injury responses. Some of these might be specific to specific events or types of sports -- joint pounding running or gymnastics puts very different stresses on the body than something like swimming or speedskating.