Cardiovascular Function and Response to Stimulation Within the First Year After Spinal Cord Injury

Inclusion Criteria: * Individuals with a spinal cord injury undergoing inpatient rehabilitation at the Kessler Institute for Rehabilitation * Between 18-75 years old * 7-50 days after injury * Injury level ≥ T6 (a cervical or a high-level chest injury) * Individuals experiencing low blood pressure after the injury * American Spinal Injury Association Impairment Scale (AIS) A or B Exclusion Criteria: * A ventilator is needed for breathing. * Devices such as brain/spine/nerve stimulators, a cardiac pacemaker/defibrillator, or intra-cardiac lines are present in the body. * There is a significant disease affecting the blood vessels or signals in the heart, or a recent heart attack (myocardial infarction) has occurred. * A new medication has been prescribed to treat blood pressure or a heart problem within the last five days (excluding midodrine). * There is a known infection in the body (e.g., urinary tract infection) or a current illness (e.g., recent diagnosis of deep vein thrombosis (DVT) or other blood clotting issues, and/or a pressure injury that might interfere with the study). * There is a history of seizures. * Pregnancy.