A muscle potential that follows the M wave, evoked consistently by electric stimuli to the motor nerve. Its amplitude is similar to that of an F wave, but the latency and morphology are constant. Usually occurs before the F wave, but may occur afterward., M lainele järgnev lihase potentsiaal. Amplituudilt sarnane F lainele, kuid erinevalt F lainest on kuju ja latents konstantsed.