Lumifer comments on Dark Arts of Rationality - LessWrong
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I'm finding that somewhat harder to research (it doesn't seem to have received as much medical attention, possibly because it's such a short-term effect), but the papers I have turned up are equivocal at best. It might be one of several metabolites involved; it doesn't seem likely to be the sole culprit.
Well, I am sure there are other factors as well but I haven't seen it disputed that lactic acid is a major contributor to the "burning" feeling during the exercise. Wikipedia goes into biochemical details.
I agree that lactic acid is much less relevant to post-exercise pain and soreness.