A system comprising: a device (105. 505) comprising: a plurality of sensor electrodes (215, 220, 225, 230) configured and arranged to contact with human tissues of a patient, the plurality of sensor electrodes (215, 220, 225, 230) including at least one transmitting electrode and at least one return electrode; a voltage source (1315, 1405) coupled between at least one of the transmitting electrodes and at least one of the return electrodes, the voltage source (1315, 1405) configured to develop a stimulation current flow into at least a portion of the human tissues of the patient; a storage medium for tangibly storing thereon a program for execution by a processor; and a control unit (810, 910) coupled to the voltage source (1315, 1405) and configured and arranged to form an electrical muscular stimulation, EMS, system that uses feedback from the human tissues of the patient in a closed loop manner to self-tune electrical properties of output from at least one of the transmitting electrodes to the human tissues of the patient, wherein the control unit (810, 910) is configured and arranged to (a) apply a first electrical pulse to the human tissues of the patient using at least one of the transmitting electrodes, (b) measure at least one electrical parameter from the human tissues of the patient related to power dissipation of the first electrical pulse in the human tissues of the patient, (c) using at least one of the transmitting electrodes adjustably apply a second electrical pulse based at least in part on the measured power dissipation, and based at least in part on the program, the second electrical pulse being adjustably controlled by the control unit (810, 910) in order to maintain substantially constant power output to the tissue across each pulse, and (d) repeat steps (a)-(c). a device (105. 505) comprising: a plurality of sensor electrodes (215, 220, 225, 230) configured and arranged to contact with human tissues of a patient, the plurality of sensor electrodes (215, 220, 225, 230) including at least one transmitting electrode and at least one return electrode; a voltage source (1315, 1405) coupled between at least one of the transmitting electrodes and at least one of the return electrodes, the voltage source (1315, 1405) configured to develop a stimulation current flow into at least a portion of the human tissues of the patient; a storage medium for tangibly storing thereon a program for execution by a processor; and a plurality of sensor electrodes (215, 220, 225, 230) configured and arranged to contact with human tissues of a patient, the plurality of sensor electrodes (215, 220, 225, 230) including at least one transmitting electrode and at least one return electrode; a voltage source (1315, 1405) coupled between at least one of the transmitting electrodes and at least one of the return electrodes, the voltage source (1315, 1405) configured to develop a stimulation current flow into at least a portion of the human tissues of the patient; a storage medium for tangibly storing thereon a program for execution by a processor; and a control unit (810, 910) coupled to the voltage source (1315, 1405) and configured and arranged to form an electrical muscular stimulation, EMS, system that uses feedback from the human tissues of the patient in a closed loop manner to self-tune electrical properties of output from at least one of the transmitting electrodes to the human tissues of the patient, wherein the control unit (810, 910) is configured and arranged to (a) apply a first electrical pulse to the human tissues of the patient using at least one of the transmitting electrodes, (b) measure at least one electrical parameter from the human tissues of the patient related to power dissipation of the first electrical pulse in the human tissues of the patient, (c) using at least one of the transmitting electrodes adjustably apply a second electrical pulse based at least in part on the measured power dissipation, and based at least in part on the program, the second electrical pulse being adjustably controlled by the control unit (810, 910) in order to maintain substantially constant power output to the tissue across each pulse, and (d) repeat steps (a)-(c).