Analysis of heat sensitivity recovery. (A) Time for recovery of sensitivity to a heat stimulus. The latency of paw withdrawal was measured before and after left sciatic nerve crush injury. Vertical arrows indicate electro-acupuncture (EA) application (group 1). (B) (a) Effects of electro-acupuncture applied at the moment of pain development (19 to 27 DPO) (group 2). In (b) enlarged view of the period of pain-related symptoms. * p < 0.05, ** p < 0.01 (ANOVA).