Here's how it happens: the body contains dissolved sodium, potassium and calcium, which are collectively known as electrolytes, which are responsible for conducting impulses along neurons. Every time a fighter gets hit on a nerve that leaves the cell potassium and calcium rushes, destabilization of the electrolyte balance, while the brain is doing everything to keep these levels in balance. With each stroke, this balance gets harder and harder to maintain and more and more energy has to be spent in the process. When the body reaches the point at which the damage outweighs the body's ability to repair itself, the brain switches to save enough energy to overcome the injured neurons at a later point.
By: Soufy Khaled