This research led to the assumption that lactic acid production
caused decreases in cellular and blood pH, which in turn caused the symptoms of muscle and body fatigue
during intense exercise. This evidence was not cause-and-affect, but rather guilt by association. Lactic acid
was shown to increase when pH decreased, and fatigue followed. No evidence existed that proved that the
acidic form of lactate (lactic acid) was produced, or that protons released from lactic acid caused the acidosis.
At this time there was no knowledge of how acids and bases interacted chemically, and therefore, no reason to
distinguish between an acid and an acid salt (Figure 1).Once this content is presented, it must be reiterated that there is no scientific evidence for explaining
acidosis by the production of lactate. Furthermore, it is important to express that several scientists have
questioned the explanation of acidosis caused by lactate production (4-10), and that an alternate explanation of
acidosis is therefore supported by numerous academics and scientists. In short, you are not alone in wanting to
provide another, more correct, explanation of the biochemical causes of acidosis.
Finally, it should also be stressed that the assumption that acidosis is caused by the production of
metabolic acids is wrong. Acids are one source of free protons, but free protons can also be released by
chemical reactions. Thus, it is possible to have chemical reactions contribute to acidosis without producing any
acids at all!