Effects of TNS and PNS on bladder contraction. A: area under the curve of the bladder contraction. B: contraction amplitude. C: contraction duration. Bladder contraction response was normalized to the control response. *Significantly (P < 0.05) different from control response (1-way ANOVA, n = 4 cats). TNS (5 Hz, 0.2 ms, 3–4T, T = 0.3–1.2 V), PNS (1–3 Hz, 0.2 ms, 1–4T, 1T = 1.4–8 V).