Figure 5. Withdrawal threshold to stimulation by von Frey filaments before surgery (Base), after spinal nerve ligation (SNL), and 1 day (P-Sx Day 1) or 7 days (P-Sx Day 7) after surgical sympathectomy. Data are expressed as median +/- 25th and 75th percentiles of 11 rats. *P < 0.05 versus baseline condition. No effect of surgical sympathectomy compared with the SNL condition was found.