Object of the invention is an electrical stimulation apparatus comprising means generating electric pulses arranged in sequences having predetermined values of typical parameters, said typical parameters comprising width, duration and frequency of said pulses, a plurality of stimulation channels, such to deliver said sequences to body regions of an organism in an independent manner, changer means intended to change at least one of said typical parameters such to substantially prevent such organism from getting inured to said electric pulses. The changer means comprise reverser means arranged such to change the pulse polarity.
