It is generally accepted that this is achieved through the action of lactic acid primarily.
en.wikipedia.org Playing on the high veldt at altitude, lungs burn and lactic acid makes legs heavy.
www.stuff.co.nz In his research, he isolated and characterized numerous compounds of the brain, such as cephalin, sphingomyelin, galactose, lactic acid and sphingosine.
en.wikipedia.org Lactic acid is produced actively without liberation of gas from glucose, fructose, mannose, sucrose, maltose, trehalose, raffinose, inulin, mannitol, sorbitol and alpha-methyl glucoside.
en.wikipedia.org Lactic acid bacteria are predominately found during child-bearing years, otherwise the bacterial flora is mixed.
en.wikipedia.org