For biofeedback-assisted pelvic floor training in stress incontinence, what Hz level is most appropriate for electrical stimulation?

• A. 10-20 Hz
• B. 20-30 Hz
• C. 30-40 Hz
• D. 50 Hz or above

Answer: (D)

The main idea here is how electrical stimulation frequency shapes the muscle response. For biofeedback-assisted pelvic floor training aimed at strengthening in stress incontinence, you want a strong, sustained contraction that reliably recruits many muscle fibers. That requires a higher frequency that produces a fused tetanic contraction rather than individual twitches. About 50 Hz or higher is commonly used because it yields a smooth, strong contraction that the patient can feel and control through the biofeedback, supporting effective strengthening and endurance training of the pelvic floor. Lower frequencies, like 10-20 Hz, create single twitches or less sustained contractions, which are not as effective for building strength and can be harder to interpret with biofeedback. Frequencies around 30-40 Hz can approach tetanus but tend to fatigue faster; 50 Hz or above provides a good balance for most patients during training sessions.