| TSS | Transcutaneous spinal stimulation |
| SCI | Spinal cord injury |
| PRM | Posterior root-muscle |
| SS-CONT | Single-site continuous |
| SS-BURST | Single-site burst |
| DS-CONT | Dual-site continuous |
| RT | Reflex threshold |
| AUC | Area under the curve |
| PPD | Paired-pulse depression |
| FDE | First drop excursion |
| RA | Response amplitude |
| EMG | Electromyography |
| ESS | Epidural spinal stimulation |