Right, I think I understand.
Not sure how you understand lactic acid but I'll stick it in basic terms anyway...
If you were to go heavy lifting, or sprinting, the human body cannot generate oxygen fast enough to supply energy to the muscles being used. Instead the use of glucose through a process called glycolysis provides the energy. That's when you switch from aerobic to anaerobic exercising, and you'll get 'the burn' where it feels like your muscles are actually burning.
Essentially, when lactic acid is produced, you'll generate lactate metabolites which your brain prefers to glucose (from Carbohydrates).
Your body will be sore, your natural energy stores will be depleted and your brain will have fed off a more organic compound if you know what I mean.
Maybe for you there'll be some determining factors which would sway the results, but the theory is black and white, or red and white in your case
Give it a shot man, gyms are empty plenty of hours in the day.