Impact of Transcutaneous Electrical Nerve Stimulation on the Autonomic Nervous System in the Treatment of Overactive Bladder

The goal of this observational study is to evaluate the impact of Transcutaneous Electrical Nerve Stimulation on the autonomic nervous system in adults women with overactive bladder. The main question it aims to answer is : Does Transcutaneous Electrical Nerve Stimulation to treat overactive bladder have an impact on the autonomic nervous system ? To answer this question, the primary outcome measure will be heart rate variability (HRV) during transcutaneous electrical nerve stimulation therapy Participants will: * Receive their first and last sessions of transcutaneous electrical nerve stimulation in the hospital. * Complete questionnaires during their first and last transcutaneous electrical nerve stimulation sessions. * Have their heart rate variability measured during their first and last transcutaneous electrical nerve stimulation sessions.

Inclusion Criteria: * Female * Adult patient aged 18 years or older * Clinical diagnosis of overactive bladder made by a urologist or gynecologist with no identified cause * Eligible for transcutaneous tibial nerve stimulation (TTNS) or interferential stimulation (IF) as part of the management of non-neurogenic overactive bladder * Body mass index (BMI) ≤ 30 kg/m² * Able to understand and complete the study questionnaires independently * No objection to participating in the study. Exclusion Criteria: * Neurogenic overactive bladder. * Local irritative factors, such as bladder stones, bladder tumors, or urinary tract infection. * Previous treatment with transcutaneous tibial nerve stimulation (TTNS). * Previous treatment with interferential stimulation (IF). * Contraindications to electrical stimulation, including: cancer, Pacemaker, Pregnancy, Conductive prosthetic material in the area of stimulation, Heart disease, Epilepsy, Active phlebitis or thrombophlebitis, Skin lesions in the treatment area * Use of anticholinergic medication during the previous three weeks * Objection to participating in the study.