In spinal cord injuries, the electrical connection between the affected area and the brain is cut off through the spinal cord and the movement signals are not sent to the muscles properly for motor activity. For this reason, people with spinal cord injuries suffer from sensory, motor, respiratory, and urinary system disorders. In recent years, it has been tried to reconstruct the motor function in the lower extremity to some extent by using functional electrical stimulation. In general, this is done in two ways: invasive and non-invasive. Non-invasive stimulation is a method that can be used to activate the motor parts of the spinal cord by placing stimulation electrodes on the skin. In this study, the main objective of this study was to activate the cell body of motor neurons related to the retractable muscles of the lower body of anesthetic rats using non-invasive stimulation Therefore, non-invasive temporal interference stimulation and transcranial non-invasive stimulation with alternating current were proposed as two non-invasive methods to eva‎luate the feasibility of restoring motor function of the lower body muscles (leg retraction movement) in anesthetized rats. selection of stimulation amplitude, stimulation frequency, and appropriate placement of stimulation electrodes are the parameters whose effect on lower body muscle activity is investigated in this study. In order to quantify the effect of stimulation parameters on lower body motor performance, a digital accelerometer was used to measure leg acceleration and the results of the two stimulation methods were compared. The results of this study showed that stimulation of alternating current did not have the ability to retract motion in the lower body joints despite the change in stimulation parameters. On the other hand, stimulation at all frequencies was able to induce shrinkage motion in the lower body of the animal with acceptable quality. The best motion with the highest acceleration was recorded at 15 and 120 Hz with high amplitude (9 mA). The results of this study can be an effective step in the treatment, improvement and rehabilitation of motor in patients with spinal cord injury. Keywords: spinal cord, Temporally interfering, Transcranial alternating current stimulation.

فرزانه شايق بروجني , احسان روحاني

امير اخوان بي تقصير

رسول امير فتاحي ورنوسفادراني , جلال ذهبي