Exam revision 2

Question 1

Which plane of motion lies vertically and divides the body into front and back halves?

Answer 1

Frontal plane

Question 2

Knee flexion plane?

Answer 2

Sagittal

Question 3

If a video trial is 10 seconds long and consists of 200 frames what is the frame rate?

A. 30 Hz
B. 50 frames per second
C. 20 frames per minute
D. 20 Hz

Answer 3

20 Hz

Question 4

What should you ensure when filming movement?

The markers are on key anatomical landmarks

The participant should be topless

The markers should be placed over the muscle

Answer 4

The markers are on key anatomical landmarks

Question 5

What colour should the central section of a spatial model be?

Answer 5

Blue

Question 6

Which of the following is a key phase of the walking gait cycle?

Heel strike

Swing

Stand

Toe off

Answer 6

Swing

Question 7

What does root mean square do to EMG data?

Removes low mean frequency noise

Removes high mean frequency noise

Removes negative numbers and averages the data

Amplifies and averages the data

Answer 7

Removes negative numbers and averages the data

Question 8

Velocity of projectile, x=6 y=3

Answer 8

6.7 ms-1

Question 9

In what plane and around which axis do star jumps take place?

Coronal and anteroposterior

Transverse and longitudinal

Frontal and mediolateral

Sagittal and mediolateral

Answer 9

Coronal and anteroposterior

Question 10

What should you ensure when filming movement?

The background should be blue

The background should be uncluttered

The background should be a contrasting colour

B and C

Answer 10

B+C

Question 11

Why do EMG signals need to be amplified?

To make changes easier to discern

To reduce the impact of mains electrical interference

As the final step of low pass filtering

B and C

Answer 11

To reduce the impact of mains electrical interference

Question 12

Rearrange v=u+at to make t the subject

t=v-u/a

t=u+a/v

t=v-u/at

t=u+av

Answer 12

t=v-u/a

Question 13

What does full wave rectification of the EMG signal mean?

Calculating the root mean square

Making the negative part of the signal positive

Performing a high pass filter on the positive portion of the signal

Calculating the change in amplitude over the full wave duration

Answer 13

Making the negative part of the signal positive

Question 14

Muscle forces in the body vary due to:

The strength of the person

The mass of the muscle

The firing rate of the muscle

A and C

Answer 14

The firing rate of the muscle

Question 15

Force can be measured using:

Load cell

Scales

Potentiometer

All of the above

Answer 15

All of the above

Question 16

Calculate Adj. opposite = 3cm, hyp/adj = 50 degrees

Answer 16

TOA
t= O/A
3/tan50

2.5