Week 5 Flashcards by Fares Soliman

Q

What is the structure of SK M?

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

What is the plasma membrane that covers a muscle fiber?

A

sarcolemma

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

What is a motor unit?

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

Can an alpha motor neuron stimulate multiple muscle fibers?

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

Define EMG signals

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

What are the components here?

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

What opens the binding cite to initiate contraction?

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

Explain the difference between large and small motor units

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

Explain depolarization

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

What is the threshold that when exceeded, an action potential emerges? What ion does this?

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

Explain repolarization

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

Define AP, resting potential, and which ion leads to each

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

Does each individual muscle fiber has its own AP?

A

yes

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

Define motor unit AP

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

What are the possible types of AP summation?

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

What does the EMG represent?

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

Define MUAPT

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

This is a “raw” EMG signal, label it

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

What is the raw sEMG range for athletes? Normal adults?

A

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

What are the basic filter types?

Study These Flashcards

A

To remove unwanted components and/or enhance wanted ones

Q

Define baseline

Study These Flashcards

A

Q

What is a possible factor that can influence EMG signal?

Study These Flashcards

A

Q

What is the red line?

Study These Flashcards

A

Q

What is the red line?

Study These Flashcards

A

line noise

Define cross talk

What is the red line?

Cross talk

Explain electromechanical delay

What is measured by EMG signals?

What is the relation between EMG and force?

How doe the recruitment of motor units progress?

What are the muscle fiber types?

Explain the difference in firing rates, EMG signal, force, and fatiguability between muscle fiber types

What are the roles of tonic vs phasic muscles?

Explain

Which muscle fibers types are used in: 1) light intensity exercise, 2) medium intensity exercise, 3) high intensity exercise

What is the firing frequency for each fiber type?

What is the power spectrum?

Explain the relation between fatigue and force

Define integrated EMG

Example study: interpret

How does PD affect movement execution?

What is the role of EMG decomposition?

Explain Hill’s muscle model

Summary

What best describes a motor unit action potential (MUAP)?

the sum of APs from all muscle fibers in a motor unit

The repetitive firing of a motor unit is known as

Motor unit action potential train (MUAPT)

When a neuron returns to - 70mv, it is said to be

Repolarized

What motor unit type is recruited first during muscle activation according to the size principle?

type I (slow oxidative)

What does a shift to lower frequencies in the EMG power spectrum typically indicate?

muscle fatigue