[Slapshot]

Hmm...none of that evidence adds up to lactic acid since I feel it right away. However, this might explain some of the sensation I feel: "If no carbs are available, the body will convert branched-chain amino acids stored in muscle into glucose in a process occurring in the liver called glucaneogenesis."

Thanks for the research. My research prior to posting found similar results. What I can't figure out is why the pain goes away at the same time. Perhaps an endorphin response...