Amplitude setting for re-ed?

• A. Maximum tolerated
• B. Enough to elicit desired movement
• C. Sub-threshold
• D. None

Answer: (B)

For re-education with electrical stimulation, set the amplitude to produce a muscle contraction that is just enough to achieve the desired movement. The goal is to retrain the correct motor pattern, so you need a contraction strong enough to drive the task (for example, a knee extension to stand up or a hand closure to grasp) but not so forceful that it causes discomfort, joint strain, or rapid fatigue. If the amplitude is too low (sub-threshold), no functional movement will occur and training stalls. If it’s set at the maximum tolerated, you risk uncomfortable, non-specific recruitment and quick fatigue, which can disrupt learning and technique. Keep the contraction at a comfortable, tolerable level that accomplishes the task, and increase gradually as the patient gains strength and control.