Electromyography Flashcards Preview

KIN 151 > Electromyography > Flashcards

Flashcards in Electromyography Deck (22)
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1
Q

Amplifier

A

Device that electrodes send signals to to records the difference between two signals

2
Q

Analog-to-Digital converter

A

Converts analog signals to digital signals

3
Q

Bipolar

A

Two electrodes placed over the muscle

4
Q

Electrode

A

Conductor where electricity enters or leaves an object, substance, or region

5
Q

Electromechanical delay

A

Delay between the electrical activity in the muscle and the force development by the muscle

6
Q

Electromyography

A

The study of electrical signals in muscles, electrical activity from all active muscle fibres below the electrodes

7
Q

Extrinsic

A

Factors outside of the muscle

8
Q

Full wave rectification

A

Take the peak-to-peak value of the signal

9
Q

Indwelling electrode

A

Needles inserted into muscle

10
Q

Innervation ratio

A

Number of muscle fibres in a motor unit

11
Q

Intrinsic

A

Factors within the muscle

12
Q

Isometric

A

Tension developed without contraction of the muscle

13
Q

Isotonic

A

Tension remains unchanged and muscle length changes

14
Q

Large motor unit

A

Thousands of muscle fibres, little control, increased muscle strength (leg muscles)

15
Q

Linear envelope

A

Looking at the average trend of the EMG data

16
Q

Motor unit

A

One motor neurone connects to many muscle fibers

17
Q

Muscle action potential

A

Electrical signals in the muscle (analog signal)

18
Q

Reference electrode

A

Electrode placed on bony prominence

19
Q

Sampling frequency

A

Number of samples taken per unit time during muscle event

20
Q

Small motor unit

A

A few muscle fibers in unit, not very strong, provide a lot of control (eye muscles)

21
Q

Somatic motor unit

A

Nerve cells that run from spinal cord to muscle

22
Q

Surface electrode

A

Stickers placed on the skin