When using EMG biofeedback to increase muscle activity, how should the therapist adjust the sensitivity?

When using EMG biofeedback to increase muscle activity, how should the therapist adjust the sensitivity?

• A. Starts at low and increases as the patient shows increased muscle activity
• B. Starts high and decreases as the patient shows an increase in muscle activity
• C. Remains at approximately mid-range during the entire treatment period
• D. Is not set, since this is not necessary for this form of biofeedback

Answer: (B)

In EMG biofeedback aimed at increasing muscle activity, the sensitivity is used to determine how easily the feedback is triggered by muscle signals. Starting with high sensitivity makes even small, early contractions visible to the patient, providing immediate reinforcement and helping establish the pattern of activation. As the patient can recruit more muscle and produce stronger signals, the therapist then lowers sensitivity (increasing the threshold), so those larger contractions become necessary to elicit feedback. This creates a progression: easy feedback at first to engage the patient, followed by harder criteria to push for stronger activation and continued improvement. Setting sensitivity too low at the start would make feedback hard to obtain and could hinder learning, while keeping it the same throughout misses an opportunity to guide gradual motor gain.

In EMG biofeedback aimed at increasing muscle activity, the sensitivity is used to determine how easily the feedback is triggered by muscle signals. Starting with high sensitivity makes even small, early contractions visible to the patient, providing immediate reinforcement and helping establish the pattern of activation. As the patient can recruit more muscle and produce stronger signals, the therapist then lowers sensitivity (increasing the threshold), so those larger contractions become necessary to elicit feedback. This creates a progression: easy feedback at first to engage the patient, followed by harder criteria to push for stronger activation and continued improvement. Setting sensitivity too low at the start would make feedback hard to obtain and could hinder learning, while keeping it the same throughout misses an opportunity to guide gradual motor gain.