: Effective therapy must account for the skin's resistance to electric current. Higher frequency currents often penetrate deeper because they face lower skin impedance than low-frequency currents.
Electrotherapy is grounded in the physics of electrical circuits and biomedical properties. Electrotherapy Explained
: A leading scientific theory suggests electrotherapy works by "blocking" pain signals to the brain or promoting the release of natural endorphins. Common Modalities and Their Uses : Effective therapy must account for the skin's
Clinicians use various "electrophysical agents" depending on the patient's needs: Electrotherapy Explained by Ann Reed and John Low | PDF Electrotherapy Explained