An increasing amount of electrical shocks to the muscle causes the muscle to contract in such a way that before it can fully relax it is electrically stimulated again. This causes summation effect where contractions get stronger and stronger the more the muscle fiber is shocked.
For example, in a lab the muscle fiber was shocked 15 times per second which caused the fiber to be in a state of incomplete tetanus.
by 5m0k3 October 1, 2009