Figure 2.

Examples of responses of the upper-limb muscles to double-pulse TSS along the rostrocaudal stimulation sites

The first (R1) and second responses (R2) elicited with the stimulation placed over EL03, EL07, EL11, and EL15 are shown for BIC, FCR, and APB for a representative participant (see pooled data for the R2/R1 ratio in Figure 3F). Stimulation intensity ranged from 20 to 100 mA for each site. TSS: transcutaneous spinal stimulation, BIC: biceps brachii; FCR: flexor carpi radialis; APB: abductor pollicis brevis muscles.