Which statement about electrode size and placement is correct for NMES re-education?

• A. Electrode size depends on the muscle; placement is muscle belly or motor point.
• B. Electrode size is fixed; placement on bone.
• C. Electrode size depends on color; placement on nerve.
• D. Electrode size depends on patient age; placement on tendon.

Answer: (A)

In NMES re-education, you control where and how the current activates the muscle by choosing the right electrode size and placement. The size of the pads matters because it changes current density: a pad that fits the target muscle well delivers the electrical charge more evenly and avoids excessive concentration that can cause discomfort, while also avoiding spread to neighboring muscles. The placement should be over the muscle belly or at a motor point—the spot where the nerve fibers supplying that muscle are most accessible near the surface. Stimulation here produces a clear, functional contraction with less current, which is ideal for retraining muscle function.

Why this is the best fit: placing pads over bone or tendon won’t reliably recruit the target muscle, and aiming at a nerve or using a fixed size without regard to the muscle’s size can lead to ineffective or uncomfortable contractions. Electrode size is not determined by color or patient age, but by the muscle you want to recruit and the goal of achieving a strong, tolerable, and controllable contraction.