**4.1 Principle of magnetic stimulation therapy**

When an electric current is passed through the coil, a magnetic field is generated along the coil axis. An electric field is induced in proportion to the rate of change of the magnetic field, stimulating skeletal muscle, the autonomic nervous system, and the somatic nervous system. When a pulsed current is passed through the coil of a chair, a pulsed magnetic field is generated in the pelvis and an eddy current is generated. The eddy current stimulates the pelvic floor muscles, which are mainly the pelvic nerve, and suppresses the pelvic nerve and stimulates the lower abdominal nerve via the afferent fibers of the pelvic nerve and bladder, and the urinary muscle. As a result, the pressure in the urethra increases and bladder contraction is suppressed.
