Study Overview: This study explores how different frequencies of noninvasive spinal stimulation affect spasticity, muscle strength, and pain in people with spinal cord injury. Spasticity is when muscles move without control. The study uses electrical pulses through electrodes placed on the lower back and stomach.

Transcutaneous Spinal Stimulation (TSS): TSS is a method of applying electrical pulses over the skin to help reduce muscle spasms without using drugs. Researchers will test three types of frequencies to find which works best. Frequency means how many electrical pulses are given over time.

• Participants will visit the Shepherd Center 4 days a week for 2-3 weeks, each visit lasting 2-3 hours.
• Testing includes measuring muscle movement, strength, and pain before and after a 30-minute stimulation session.
• Participants must be 16 years or older, have a spinal cord injury, and experience some leg spasticity.

Exclusions: People with worsening spinal problems, heart issues, certain neurological disorders, or implanted stimulators cannot participate. Pregnant women and those with certain medical conditions are also excluded.