a randomized, sham-controlled, double-blinded and parallel group trial (10 therapeutic sessions) with the combination between physical therapy combinated and active tsDCS in improving the motor function of adult patients with chronic incomplete spinal cord injury. The sessions will be performed five times a week for a month.

a randomized, sham-controlled, double-blinded and parallel group trial (10 therapeutic sessions) with the combination between physical therapy combinated and sham tsDCS in improving the motor function of adult patients with chronic incomplete spinal cord injury. The sessions will be performed five times a week for a month.

Patients with a neurological level above T10 will receive cervical tsDCS (anode electrode at C7, and the cathode electrode on the right shoulder). Patients with a neurological level from T10 onwards will receive thoracic tsDCS (anode electrode at T10, and the cathode electrode at the iliac crest). (i) Experimental group (active tsDCS): electrical stimulator (Neuroconn/Germany) connected to a pair of saline-soaked sponge electrodes (35 cm²) with a current intensity of 2.5 mA for 20 minutes. (ii) Control group (sham tsDCS) with electrodes positioned at the same locations as active tsDCS, for 30 seconds (the setup will remain for the full 20 minutes). Thus, patients will experience the initial sensations at the stimulated site, without inducing an effect. Physical therapy will be performed during tsDCS (45 minutes), based on scientific evidence, considering patient preferences, and respecting motor learning theory and neuroplasticity principles, focusing on motor function recovery.

It is an international scale. The UEMS and LEMS are composed of the sum of muscle function grading for the five key muscles of the upper and lower limbs (respectively) as defined by ASIA. The score for each muscle is graded from '0' to '5', and the total score can range from '0' to '50'. To calculate this, the scores for the five muscles of each limb (upper and lower/ left and right) should be summed. The higher the score, the better the motor function.

This is international scale, it is the gold standard for the diagnosis of spinal cord injury and is used worldwide. The AIS categorizes the lesion from full spinal cord injury to normal degree (severity of the injury), according to sensory-motor preservation, passing through degrees of spinal cord injury (A , B, C, D or E).

(i) AIS A (Complete): no motor or sensory function preserved in the sacral regions (S4-S5); (ii) AIS B (Sensory incomplete): sensory function, but not motor, preserved below the neurological level; (iii) AIS C (Motor incomplete): motor function preserved, with more than half of the muscles scoring less than 3; (vi) AIS D (Motor incomplete): motor function preserved, with more than half of the muscles scoring 3 or more; and (v) AIS E (Normal): normal motor and sensory function. Observations: "AIS A" represents the worse outcome regarding the severity of the injury, and "AIS E" represents the better.