Does latic acid cause muscle fatigue?

Lactic acid is produced when the body performs shot, intense bursts of work. Lactic acid comes from the body's need for quick energy. As such, the body converts glucose (stored sugars) into ATP (Usable energy) rapidly without the use of oxygen. This is Anaerobic activity because there is no use of oxygen.

Fatigue develops after an extended use of Anaerobic work. The body uses Lactate (lactic acid) for fast energy and has to work to remove the waste products from your muscles. This is the burn and fatigue you feel.