To minimize electrode resistance during electrical stimulation, which practice is recommended?

To minimize electrode resistance during electrical stimulation, which practice is recommended?

• A. Keep sponge interface well moistened
• B. Maintain even and firm contact with skin
• C. Remove hair from skin
• D. Use large electrodes

Answer: (A)

Minimizing electrode resistance hinges on the quality of the conductive path between the electrode and the skin. A sponge interface that is well moistened with saline provides ions that carry the current efficiently and fills microscopic gaps, reducing insulating air pockets at the skin contact. This lowers the interfacial impedance, allowing the stimulation current to flow more readily and more evenly to the underlying tissues. Keeping the sponge moist maintains this low resistance throughout the session, whereas a dry interface increases impedance and can lead to uneven stimulation or discomfort. While firm, even contact helps prevent air gaps, and hair removal or electrode size have other effects (like comfort or current density) that don’t address the core issue of the skin–electrode conducting barrier as directly as moist conduction does.

Minimizing electrode resistance hinges on the quality of the conductive path between the electrode and the skin. A sponge interface that is well moistened with saline provides ions that carry the current efficiently and fills microscopic gaps, reducing insulating air pockets at the skin contact. This lowers the interfacial impedance, allowing the stimulation current to flow more readily and more evenly to the underlying tissues. Keeping the sponge moist maintains this low resistance throughout the session, whereas a dry interface increases impedance and can lead to uneven stimulation or discomfort. While firm, even contact helps prevent air gaps, and hair removal or electrode size have other effects (like comfort or current density) that don’t address the core issue of the skin–electrode conducting barrier as directly as moist conduction does.