Electrical Stimulation Passive Care Exam 1 Practice Test 2026 – Your All-in-One Guide to Exam Success!

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What is IFC and how does it differ from TENS in terms of frequency and depth of penetration?

Interferential current uses two medium-frequency carriers that produce a low-frequency beat; depth of penetration is greater with less cutaneous impedance than TENS.

Interferential current uses a single high-frequency carrier and deeper tissue conduction.

Interferential current is identical to TENS in depth.

Interferential current works by delivering two medium-frequency currents that cross in the tissues, and where they intersect the frequencies combine to create a low-frequency beat inside the body. That low-frequency beat is what provides the therapeutic effect, such as analgesia, while the high carrier frequencies pass through the skin with less resistance and discomfort. Because the carriers are high, skin impedance is reduced, allowing the current to reach deeper tissues more effectively than a typical TENS setup, which uses a single current at a lower frequency and tends to stimulate more superficial nerves. So IFC delivers deeper stimulation by using two high-frequency carriers to produce a low-frequency beat inside the tissue, whereas TENS largely affects more superficial tissues due to its lower-frequency single-channel approach.

Interferential current only heats tissue, not analgesia.