Figure 7. Time-course changes in root mean square (RMS) and mean power frequency (MPF) values of electromyographic signals recorded from the sacrococcygeus dorsi lateralis muscle before (C) and after intrathecally administered aCSF or kainic acid (KA, 0.25 or 2.5 nmol), followed by intravenously administered fentanyl (100 micro gram/kg). Values presented are mean +/- SD, n = 6–8 animals per group. (dagger) P < 0.05 versus the corresponding baseline group in the Dunnett test. *P < 0.05 versus the aCSF group at comparable post-KA time points in the Scheff test.