What does low electrode impedance imply in NMES?

• A. Predictable current delivery with effective contractions
• B. Increased heating and discomfort
• C. No current flow
• D. Requires longer ramp times

Answer: (A)

Low electrode impedance means the skin-electrode interface offers little resistance, so the NMES device can push the commanded current through efficiently. With less resistance, the actual current reaching the nerves and muscles stays close to what the device intends, producing contractions that are reliable and repeatable. If impedance were higher, the delivered current would drop, leading to weaker or inconsistent contractions, which is why good skin preparation and good electrode contact matter.

The idea that there would be no current flow isn’t accurate—low impedance facilitates current flow. Ramp time is not determined by impedance itself; it’s a comfort adjustment, while heating and discomfort depend more on how much current is delivered and for how long.