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Electromyograph Tool and Electrode Types

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Electromyograph Tool and Electrode Types

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Questions and Answers

What is the purpose of using needle electrodes in electromyography?

To diagnose muscle disease

To record the overall activity of a muscle

To investigate neuromuscular disease (correct)

To study transmembrane potentials

Which type of electrode is not suitable for diagnosing muscle disease in electromyography?

Surface electrodes (correct)

Transmembrane electrodes

Needle electrodes

Concentric needle electrodes

What do both needle electrodes and surface electrodes detect in electromyography?

Motor unit dispersion

Transmembrane potentials

Potentials surrounding an active muscle fiber (correct)

Overall muscle activity

What is the basis for nerve conduction measurements in electromyography?

Evoked potential produced by an electrical stimulator Signup and view all the answers

Why can't electromyography be recorded from a single motor unit?

Muscle fibers are dispersed throughout the muscle's cross-section Signup and view all the answers

What does an upwards diversion in electromyography represent?

Negative potential Signup and view all the answers

What is the range of frequency content in a typical EMG signal from a needle electrode?

10 Hz to 5 kHz Signup and view all the answers

What is a characteristic of a bipolar concentric needle electrode in EMG recording?

Records signals between two exposed faces of platinum at the needle tip Signup and view all the answers

Why are surface electrodes preferred for recording EMG signals from active muscles?

They are more convenient and affordable Signup and view all the answers

How does an EMG machine's block diagram assist in signal processing?

It represents the structure of the recording amplifier Signup and view all the answers

What impact does increasing muscle contraction strength have on EMG signals?

Increases spike repetition frequency Signup and view all the answers

What is a key difference between a monopolar and a bipolar concentric needle electrode?

Monopolar records from tip to shaft, while bipolar records between two exposed faces of platinum Signup and view all the answers