Podcast
Questions and Answers
What is the purpose of using needle electrodes in electromyography?
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?
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?
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?
What is the basis for nerve conduction measurements in electromyography?
Why can't electromyography be recorded from a single motor unit?
Why can't electromyography be recorded from a single motor unit?
What does an upwards diversion in electromyography represent?
What does an upwards diversion in electromyography represent?
What is the range of frequency content in a typical EMG signal from a needle electrode?
What is the range of frequency content in a typical EMG signal from a needle electrode?
What is a characteristic of a bipolar concentric needle electrode in EMG recording?
What is a characteristic of a bipolar concentric needle electrode in EMG recording?
Why are surface electrodes preferred for recording EMG signals from active muscles?
Why are surface electrodes preferred for recording EMG signals from active muscles?
How does an EMG machine's block diagram assist in signal processing?
How does an EMG machine's block diagram assist in signal processing?
What impact does increasing muscle contraction strength have on EMG signals?
What impact does increasing muscle contraction strength have on EMG signals?
What is a key difference between a monopolar and a bipolar concentric needle electrode?
What is a key difference between a monopolar and a bipolar concentric needle electrode?
