Single transspinal stimuli induced transspinal evoked potential (TEP) depression in thigh muscles for KNIKOU-LAB4Recovery protocol (P-KLAB), protocol 2 (P-2), protocol 3 (P-3), and protocol 4 (P-4). Representative examples of nonrectified waveform averages (n = 12) of TEPs recorded from the left (L) and right (R) vastus lateralis (VL), rectus femoris (RF), and medial hamstrings (MH) muscles upon thoracolumbar stimulation at frequencies of 0.1 and 1.0 Hz for all 4 protocols tested in this study.