Electromyography (EMG): Measure Muscle Activity in Motor Control

Question 1

Which of the following is a key advantage of intramuscular EMG over surface EMG?

Accepted Answer

Improved signal-to-noise ratio

Answer

Reduced invasiveness

Answer

Ability to record from superficial muscles

Question 2

What is the fundamental principle of electromyography (EMG) for measuring muscle activity?

Accepted Answer

EMG measures electrical signals from muscle contractions.

Answer

EMG electrodes are placed on the skin's surface.

Answer

EMG signals can be used for both qualitative and quantitative analysis.

Question 3

Which of the following is NOT a type of electromyography (EMG)?

Accepted Answer

Electroencephalography

Answer

Surface EMG

Answer

Intramuscular EMG

Answer

Electrogastrography

Question 4

What is the main application of surface EMG in the field of motor control?

Accepted Answer

Monitoring muscle activation patterns during movement

Answer

Assessing muscle fatigue

Answer

Controlling prosthetic devices

Answer

Diagnosing neuromuscular disorders

Question 5

What type of electrode is used for intramuscular EMG recordings?

Accepted Answer

Needle electrode

Answer

Patch electrode

Answer

Wire electrode

Answer

Surface electrode

Question 6

Which of the following is a potential limitation of intramuscular EMG?

Accepted Answer

Risk of tissue damage

Answer

High cost of equipment

Answer

Difficulty in interpreting signals

Answer

Low signal-to-noise ratio

Question 7

What is the fundamental difference between surface EMG and intramuscular EMG?

Accepted Answer

Invasive versus non-invasive

Answer

Cost

Answer

Applications

Answer

Signal quality

Question 8

What is the primary advantage of EMG in sports science research?

Accepted Answer

Quantifying muscle activity during dynamic movements

Answer

Diagnosing injuries

Answer

Training athletes more effectively

Answer

Monitoring muscle recovery

Question 9

Which of the following is a common application of EMG in motor control research?

Accepted Answer

Investigating muscle coordination patterns

Answer

Monitoring muscle fatigue

Answer

Diagnosing neurological disorders

Answer

Evaluating assistive devices

Question 10

What is a key ethical responsibility of researchers conducting EMG studies involving human participants?

Accepted Answer

Obtaining informed consent and minimizing discomfort

Answer

Ensuring accuracy of data collection

Answer

Interpreting data objectively

Question 11

Which of the following is NOT an advantage of surface electromyography (sEMG)?

Accepted Answer

Provides detailed information about individual motor units

Answer

Non-invasive and easy to use

Answer

Can measure muscle activity from multiple sites simultaneously

Answer

Cost-effective

Question 12

**Improved:** What is the primary purpose of intramuscular electromyography (iEMG)?

Accepted Answer

**Improved:** To precisely record electrical impulses from individual motor units within a muscle

Answer

**Improved:** To detect the onset of muscle fatigue

Answer

**Improved:** To measure the collective activity of a larger muscle mass

Question 13

**Improved:** Which of the following factors can impact the accuracy of EMG data?

Accepted Answer

**Improved:** Electrode placement, skin preparation, and muscle movement

Answer

**Improved:** Electrode placement alone

Answer

**Improved:** Muscle movement alone

Question 14

**Improved:** What is the function of the amplifier in an EMG system?

Accepted Answer

**Improved:** To amplify the amplitude of the EMG signal

Answer

**Improved:** To eliminate background noise from the EMG signal

Answer

**Improved:** To transform the EMG signal into digital format

Answer

**Improved:** To display the EMG signal on a monitor

Question 15

**Improved:** Which of the following demonstrates an application of EMG in motor control research?

Accepted Answer

**Improved:** Studying the coordination of muscle activity during multifaceted movements

Answer

**Improved:** Evaluating muscle strength and endurance

Answer

**Improved:** Diagnosing neuromuscular disorders

Question 16

**Improved:** What distinguishes bipolar from monopolar EMG recordings?

Accepted Answer

**Improved:** Bipolar recordings measure the potential difference between two electrodes, while monopolar recordings measure the potential difference between an electrode and a reference point

Answer

**Improved:** Bipolar recordings measure muscle activity over a larger area than monopolar recordings

Question 17

**Improved:** What is a limitation of EMG in assessing muscle fatigue?

Accepted Answer

**Improved:** EMG cannot differentiate between central and peripheral fatigue

Answer

**Improved:** EMG can only measure muscle exertion, not force production

Answer

**Improved:** EMG recordings can be affected by electrode positioning and movement

Question 18

**Improved:** Define the recruitment threshold.

Accepted Answer

**Improved:** The minimal level of motor neuron activation required to elicit a muscle contraction

Answer

**Improved:** The duration of a muscle action potential

Answer

**Improved:** The maximal muscle force that can be produced

Question 19

**Improved:** Which attribute characterizes a voluntary muscle contraction?

Accepted Answer

**Improved:** It is initiated by a conscious decision

Answer

**Improved:** It results in sustained muscle contraction

Answer

**Improved:** It involves the simultaneous activation of all motor units in the muscle

Answer

**Improved:** It is not susceptible to fatigue

Question 20

**Improved:** How does EMG assist in diagnosing neuromuscular disorders?

Accepted Answer

**Improved:** It can detect unusual muscle activity patterns and identify muscle weakness

Answer

**Improved:** It can directly visualize muscle structure

Answer

**Improved:** It can measure nerve conduction velocity

Question 21

Which of the following is NOT a limitation of surface electromyography (sEMG)?

Accepted Answer

Detects activity deep within muscle fibres

Answer

Susceptible to movement artefacts

Answer

Limited accuracy with complex movements

Answer

Requires proper skin preparation

Question 22

Which type of EMG electrode is inserted directly into a muscle?

Accepted Answer

Needle EMG

Answer

Surface EMG

Answer

External EMG

Answer

Transcutaneous EMG

Question 23

How is EMG primarily used in motor control research?

Accepted Answer

To analyse muscle activation patterns

Answer

To determine muscle strength capacity

Answer

To diagnose muscular diseases

Answer

To measure joint range of motion

Question 24

What differentiates concentric from eccentric muscle actions?

Accepted Answer

Muscle length changes relative to force production

Answer

Pattern of muscle fiber activation

Answer

Total force generated by the muscle

Answer

Energy expenditure of the muscle

Question 25

Which term describes the activation of a small number of motor units for a low-force contraction?

Accepted Answer

Recruitment

Answer

Rate coding

Answer

Synchronization

Answer

Summation

Question 26

Which reflex helps prevent muscle damage from excessive stretching?

Accepted Answer

Stretch reflex

Answer

Withdrawal reflex

Answer

Crossed extensor reflex

Answer

Golgi tendon reflex

Question 27

Which technique is used to examine the activity of individual motor units?

Accepted Answer

Single fiber EMG

Answer

Intramuscular EMG

Answer

High-density EMG

Answer

Surface EMG

Question 28

What is the primary advantage of wireless EMG systems?

Accepted Answer

Greater freedom of movement

Answer

Superior signal quality without wires

Answer

Improved signal accuracy

Answer

Reduced cost compared to wired systems