Tibial nerve stimulation (TNS) of 1-Hz frequency improved voiding efficiency and reduced residual volume by increasing the duration of bladder contractions. A: bladder capacity. B: voiding efficiency. C: residual volume. D: duration of bladder contraction. E: amplitude of bladder contraction. F: area under contraction curve. Parameters in A, B, D, and E are normalized to the control values except in C the residual volumes are normalized to the control bladder capacity. TNS: 1 Hz, 0.2 ms, 4T = 2.0–5.6 V. *Significantly (P < 0.05) different from the control (one-way ANOVA). #Significantly (P < 0.05) different from the 5th CMG (one-way ANOVA); n = 9 cats.