That is one theory for DOMS not burning.

The burning is a result of anaerobic glycolosis. Specifically fast glycolosis during periods of low oxygen availability to the muslces.

Glycolosis the anaerobic breakdown of carbohydrates to produce ATP for the muscles.

In this case of the burn it is specifically fast glycolosis (as opposed to "slow" glycoloisis).

This results in lactic acid as an end-product in the muscles. Eventually this lactic acid is convered to lactate which is itself used as an energy substrate. But when the production of lactic acide outstrips the buffering and utylisatioin of it it builds ups in the muscle along with an increase in hydrogen ions.

It is thought (just a theory) that the hydrogen ions are responsible for the burn and that this acid directly interferes with muscle contractions and aslo by decreasing the PH which messes up the energy systems.

The pump is simply the buildup of the waste products in the muscle, including blood, which is why people refer to it as a 'blood pump' sometimes.

This whole process is LOCAL. Meaning specific to the muscles that are being worked.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.