What is electrotherapy?

• A. A form of manual therapy using hands
• B. Electrical stimulation that produces magnetic, chemical, mechanical, and thermal effects on tissue
• C. A modality that uses heat to relax muscles
• D. A therapy using sound waves to image tissue

Answer: (B)

Electrotherapy involves applying electrical energy to the body to provoke tissue responses. When electrical current is delivered to tissues, it can produce several kinds of effects: a magnetic effect from the changing electric field, chemical changes at the cellular level due to ion movement, mechanical effects such as muscle contractions or tissue micro-murbent, and thermal effects from tissue heating as current encounters resistance. This combination of actions is what makes electrotherapy useful in rehabilitation, enabling analgesia, muscle re-education, edema reduction, and soft-tissue healing through different modalities that rely on these underlying responses. It’s distinct from hands-on manual therapy, from therapies that rely solely on heat to relax muscles, and from imaging techniques that use sound waves.