RL and LL electrodes should be placed on which skin area?

RL and LL electrodes should be placed on which skin area?

• A. Clean, dry, fat area of calf
• B. Clean, dry, bony area of wrist
• C. Hairy, damp thigh
• D. Oily shin

Answer: (A)

Placing RL and LL electrodes on a clean, dry, soft tissue area with enough fat reduces skin impedance and keeps the electrodes from popping off. The calf provides that kind of tissue—it's typically clean, dry, and not bony, giving better contact and more stable readings than bony or oily areas. If you put electrodes on a wrist’s bony area, or on a hairy, damp thigh, or on an oily shin, the skin impedance tends to be higher and adhesion can be poorer, which degrades signal quality and makes movement artifacts more likely.

Placing RL and LL electrodes on a clean, dry, soft tissue area with enough fat reduces skin impedance and keeps the electrodes from popping off. The calf provides that kind of tissue—it's typically clean, dry, and not bony, giving better contact and more stable readings than bony or oily areas.

If you put electrodes on a wrist’s bony area, or on a hairy, damp thigh, or on an oily shin, the skin impedance tends to be higher and adhesion can be poorer, which degrades signal quality and makes movement artifacts more likely.