Influence of Spinal Stimulation Frequency on Spasticity, Motor Control, and Pain After Spinal Cord Injury

Inclusion Criteria: * Participants must agree to allow use of health information. * Participants should be 16 years old or older. * Participants must have had a spinal cord injury (SCI) of any severity (AIS A, B, C, or D) that happened at least 3 months ago. * Objectively measurable spasticity in your legs. * Participants must inform the investigators if there is a change in medications during the study. * Participants must be able to follow instructions. * Participants must be able to communicate if pain or discomfort is experienced. Exclusion Criteria: * People with spinal issues that are getting worse, such as degenerative or progressive vascular disorders. * People neurological problems other than SCI. * People with an injury level is below T12. * People with un-treated or uncontrolled heart problems that the lead investigator believes could be affected by stimulation or affected by an increase in blood pressure. * People with bone or joint problems that would make it hard to follow the study plan. * Women who are pregnant or actively trying to become pregnant. * People with implanted stimulators (like a baclofen pump, spinal stimulator, heart defibrillator, or diaphragmatic pacemaker) * People with infection. * People with skin that is broken or wounds in the area of the body where stimulation is applied. * People who have or had certain types of cancer in the area of the body where stimulation will be applied. * People who have had botulinum toxin or numbing shots in the test leg or spine in the last 6 months * People who have had permanent spasticity treatment in the test leg or spine (like a certain type of surgery). * Other health issues that the lead investigator things could make it unsafe for you to join the study.