EMG Instrumentation & Data Interpretation

Question 1

What is the function of an amplifier in EMG instrumentation?

Accepted Answer

Amplifies muscle electrical activity

Answer

Reduces background noise

Answer

Converts electrical signals to sound

Answer

Measures temperature changes

Question 2

Which setting affects the frequency range displayed in an EMG reading?

Accepted Answer

Filter settings

Answer

Gain

Answer

Sweep speed

Answer

Needle depth

Question 3

What does a polyphasic motor unit potential indicate?

Accepted Answer

Reinnervation or neuromuscular disorder

Answer

Normal resting state

Answer

Muscle fatigue

Answer

Equipment malfunction

Question 4

What does the sweep speed control in EMG equipment?

Accepted Answer

Time resolution of waveform display

Answer

Signal amplitude

Answer

Muscle contraction force

Answer

Depth of electrode insertion

Question 5

How does improper grounding affect EMG signals?

Accepted Answer

Introduces signal noise and interference

Answer

Improves muscle detection

Answer

Reduces latency

Answer

Slows down response time

Question 6

What does a prolonged latency in nerve conduction study suggest?

Accepted Answer

Nerve conduction delay or damage

Answer

Increased muscle strength

Answer

Improved signal conduction

Answer

Normal neuromuscular function