Effect of Galvanic Vestibular Stimulation on Cortical Excitability and Hand Dexterity in Multiple Sclerosis Patients

Inclusion Criteria: 1. Patients with ataxic RRMS type of both genders will be recruited. The last MS relapse occurred at least 3 months prior to the study. 2. Patients' age will range from 20 to 45 years old. 3. Ambulant Patients who meet the level less than or equal to 5 on EDSS will be recruited. 4. Patients' score on Mini Mental State Examination should be \> 26. 5. Mild or no spasticity (grade 1 or 1+) according to Modified Ashworth Scale. 6. All patients must at least hold Primary stage certificate of education from one of the Egyptian educational authorities. 7. All patients can independently sign consent form Exclusion Criteria: * Patients will be excluded if they have: 1. Moderate to severe auditory or visual or cognitive impairment. 2. Coexistence of other neurological diagnoses of Central or Peripheral Nervous system (e.g. cerebrovascular stroke, vestibulopathy or polyneuropathy). 3. History of any problems that hinder conduction of aerobic training or magnetic stimulation (e.g. deep venous thrombosis, shunts and pacemakers).