Ace BOC Domain 4 in 2026 – Get Set for Treatment & Rehab Triumph!

Electrotherapy uses electrical currents delivered through the skin to influence nerves or muscles. An example is a Tens unit, which sends electrical impulses to modulate pain signals or stimulate muscles. The other options use different forms of energy: laser provides light energy, massage is manual mechanical manipulation, and ultrasound uses high-frequency sound waves. So the Tens unit best fits electrotherapy because it relies on electrical stimulation.