What is the typical depth difference between conventional TENS and IFC in terms of penetration?

• A. TENS deeper than IFC
• B. IFC deeper than conventional TENS
• C. Same depth
• D. Not applicable

Answer: (B)

Understanding how depth of stimulation is influenced by carrier frequency helps explain this difference. IFC uses two medium‑frequency currents that interfere to create a low‑frequency beat inside the tissues. Those higher carrier frequencies reduce skin impedance, allowing energy to reach deeper tissues before it dissipates, so the stimulation targets deeper nerves and muscles. Conventional TENS typically uses lower frequencies, so the energy tends to stay more superficial, mainly affecting nerves near the skin. Because of this depth effect, IFC generally provides deeper penetration than conventional TENS.