In the Russian NMES protocol, what are the typical carrier frequency and burst frequency?

• A. Carrier frequency around 10 Hz, bursts 100 Hz
• B. Carrier frequency around 2,500 Hz, bursts around 50 Hz
• C. Carrier frequency around 4,000 Hz, bursts 4 Hz
• D. Carrier frequency around 50 Hz, bursts 2,500 Hz

Answer: (B)

The key idea is that Russian NMES uses a medium-frequency carrier that is modulated in bursts. The typical setup uses a carrier around 2,500 Hz, which helps reduce skin impedance and makes the stimulation more comfortable while still delivering energy to the muscle. The bursts occur at about 50 Hz, meaning about 50 bursts per second, which produces a smooth, tetanic contraction rather than distinct twitches. This combination—2,500 Hz carrier with bursts at 50 Hz—is what gives the protocol its characteristic balance of comfort and effective muscle activation.