Practice Quiz

PTA Physical Therapy Assistant

Category - Therapeutic Modalities

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What is ‘gain’ in a biofeedback machine?
  1. False readings
  2. Ability to amplify input signal
  3. Difference between the lowest and highest frequency
  4. Unwanted electrical signal
Explanation
Answer: B - Gain is the ability to amplify input signal.

Surface EMG needs the high gain.

False readings are known as artifacts.

Differences between the lowest and highest frequency is known as bandwidth.

Unwanted electrical signals are called noise. Lowering the noise betters the recording.
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