Nerve stimulation performed within a few seconds after a brief period (2 to 60 s) of tetanic nerve stimulation or strong voluntary contraction may show changes in the configuration of the M wave(s) compared to the results of nerve stimulation of the rested muscle as follows: a) repair of the decrement – A diminution of the decrementing response to slow rates (2 to 5 Hz) of repetitive nerve stimulation; b) increment after exercise – An increase in the amplitude and area of the M wave elicited by a single supramaximal stimulus.
