Which setting can be used to strengthen healthy muscles?

• A. Russian or VMS
• B. TENS
• C. IFC
• D. NMES combined with heat

Answer: (A)

Strengthening healthy muscles with electrical stimulation relies on a mode that reliably provokes strong, controlled muscle contractions. Russian current, also called VMS, is a form of NMES designed exactly for this purpose. It delivers a medium-frequency carrier in short bursts, which creates a strong tetanic contraction while keeping comfort reasonable. This setup is chosen to train the muscle effectively, similar to voluntary contraction, and is commonly used for strengthening in healthy or weakened muscles.

TENS, by contrast, is aimed at pain relief and largely modulates sensory nerves rather than producing the strong, motor-driven contractions needed for strengthening. IFC is primarily used for deeper pain modulation and tissue healing through beat frequencies, not for reliably driving strong muscle contractions for strengthening. NMES with heat adds heat, which isn’t necessary for strengthening and can complicate the response or comfort; the strengthening effect comes from the electrical stimulation itself, not the accompanying warmth.

So the setting best suited to strengthen healthy muscles is the Russian or VMS mode, because it’s specifically designed to elicit effective, strength-building contractions.