Fig. 6

ECAP and EMG dose-response curves. A Representative ECAP component in median ESR and EMG recordings (from intercostal muscle between the lowest two ribs) plotted overlain on 300 raw traces for stimulation amplitudes of 1.2 mA, 2 mA, and 3 mA with two leads placed in series. The left column, in red, shows ESR from channel Ch13. The two dashed lines indicate the ECAP component window from 0.33 to 1.80 ms. The EMG window is from 1.8 to 13 ms. The right column, in blue, shows the EMG from a needle electrode placed in the longissimus muscle. The dashed line indicated the start of the EMG window. B Dose response curve of the ECAP component (red) and EMG (blue) signals from (A). The magnitude of the response is calculated using area under the curve of the signal in the defined ECAP and EMG windows shown in (A), respectively. The vertical dotted lines indicate the ECAP and EMG threshold where the first response is observed in each dose-response curve