To assess the effect of urine stream interruption exercise on micturition. This study was conducted prospectively in female patients without urinary disorders. Two uroflowmetries were performed: one during a usual micturition and one during an exercise of urine stream interruption. For the urine stream interruption exercise the subject was asked to begin the micturition, to stop it at 3 s, when the stream is interrupted, to start voiding again, then again stop it at 3 s and repeat this manoeuvre until the end of the micturition. Twenty female patients (mean age 38.7 years old, SD 12.3) were included. Post void residual volume was higher after the urine stream interruption micturition (mean 36.7 mL, SD 46.6) than during standard micturition (mean 8.2 mL, SD 24.1) (P = 0.02). During normal voiding, the maximal flow rate was higher (26.9 mL/min vs 17.8 mL/min; P < 0.0001). There was no difference concerning neither the voiding volume nor the slope of ascending part of flow curve. During urine stream interruption micturition, the flow rate slope, the voiding volume and the maximal flow rate by voiding sequence were decreasing as the voiding sequences followed each other. Urine stream interruption increases the post-void residual volume and translates into less efficient micturition. Thus, it should not be used in current practice of pelvic floor muscles training.