Single-subject transspinal evoked potential (TEP) recruitment input-output curves for KNIKOU-LAB4Recovery protocol (P-KLAB), protocol 2 (P-2), protocol 3 (P-3), and protocol 4 (P-4). Recruitment input-output curves of TEPs recorded from the left (L; A) and right (R; B) leg muscles for P-KLAB, P-2, P-3, and P-4. TEP amplitude is plotted against the stimulation intensities along with the sigmoid function fitted to the data. MH, medial hamstring; SOL, soleus; TA, tibialis anterior; VL, vastus lateralis.