Inclusion Criteria:  AIS C or D. 2-6 months after injury. Neurological level of injury between C4-T11. Ashworth less or equal 2. Penn less or equal 2. To understand and to sign the informed consent.  Exclusion Criteria:  Metal implants over T11-T12 Electronic device implants. Epilepsy Allergy to the electrode material Pregnancy Concomitant pathologies Pathology or fracture of the lower limbs Musculoskeletal injury in the lower limbs Lower limbs dysmetria