Inclusion Criteria:  anterior cruciate ligament tear with arthroscopic reconstruction, between 6 and 18 months before the tests; Tegner activity level > 5; Body Mass Index between 18 and 25; voluntary knee extension of at least 70°; ability to understand the instructions; ability to wittingly sign the informed consent form.  Exclusion Criteria:  other previous knee injuries or surgical interventions; major procedures associated with the anterior cruciate ligament reconstruction: osteotomy, other ligaments reconstruction; meniscectomy, with surgical removal of more than 30% of the meniscal volume or removal of the meniscal root; comorbidities, such as: rheumatic diseases; other congenital or acquired neuromuscular pathologies; diabetes mellitus; osteoporosis; cancer; heart disease; history of epilepsy, endocranial hypertension; first degree relatives affected by epilepsy; current treatment with oral anticoagulant or antiplatelet therapy; drug therapy, which could induce epileptic crisis; history of high alcohol consumption; implanted electro-sensitive devices; implanted intracranial or intraocular metallic devices; history of retinal detachment; presence of cochlear implant.