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Biomechanics Case Study > MCQ > Flashcards

MCQ Flashcards

1
Q

What is kinematics?

A

The study of joint angles

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2
Q

What plane is knee extension measured in?

A

Sagittal plane

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3
Q

What plane is shoulder adduction measured in?

A

frontal/ coronal

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4
Q

How many frames in a half minute long 25FPS video?

A

750

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5
Q

If a car is moving at 30ms and uniformly slows down to 5ms in 5s then its deceleration is?

A

-5ms

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6
Q

What is the resultant velocity of the projectile represented by the green line?

6cm by 3cm triangle

A

6.7ms

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7
Q

What is the resultant velocity of the projectile represented by the green line?

5cm by 2cm triangle

A

5.3ms

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8
Q

List the equations for SOH CAH TOA

A 
sin = opp/hyp
cos = adj/hyp
tan = opp/adj
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9
Q

Normalisation of sEMG requires?

A

Maximum voluntary contraction

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10
Q

Which of these is not a method of processing EMG signals?

A

Root median squared

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11
Q

What is the balance system of the inner ear called?

A

Vestibular

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12
Q 
Which of the following is a key phase of running?
Balance
Foot contact
Stance
Double limb support
A

Stance

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13
Q

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

A

Frontal/ coronal

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14
Q

Knee flexion takes place in what plane?

A

Saggital

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15
Q

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

A

20Hz

200/10

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16
Q

What should you ensure when filming movement?
A-The markers are on key bony landmarks
B-The participant should be topless
C-The markers should be placed over the muscle
D- A and B

A

A- markers on key anatomical landmarks

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17
Q

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

A

Blue

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18
Q 
Which of the following is a key phase of the walking gait cycle?
Heel strike
Swing 
Stand
Toe off
A

Swing

19
Q

What does root mean square do to EMG data?

A

Removes negative numbers and averages the data

20
Q

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

A

Coronal and anteroposterior

21
Q 
What should you ensure when filming movement?
A-the background should be blue 
B-The background should be uncluttered
C-The background should be contrasting
D-B and C
A

D- uncluttered and contrasting

22
Q

Why do EMG signals need to be amplified?

A

To reduce impact of mains electrical interference

23
Q

Rearrange v=u+at to make t the subject?

A

t= v-u/a

24
Q

What does full wave rectification of the EMG signal mean?

A

Calculating the change in amplitude over full wave

25
Q

Muscle forces in the body vary due to?

A

Firing rate of the muscle

26
Q 
Force can be measured using?
A-Load cell
B-Scales
C-Potenionmeter
D-All of the above
A

D- all of the above

27
Q

Calculate QR

find adj
got opp = 3cm
angle = 50 degrees

A

QR= 2.5cm

Tan
3/ tan (50)

28
Q

what axis does the saggital plane refer to?

A

Medial lateral axis

29
Q

what axis does the coronal/ frontal plane refer to?

A

Anteroposterior axis

30
Q

what axis does the transverse plane refer to?

A

Longitudinal axis

31
Q

define kinematics?

A

study of joint angles

32
Q

define kinetics?

A

study/ measurement of forces

33
Q

how should the camera be set up when analysing data?

A
  • perpendicular to the plane of motion (CS=coronal)
  • have whole body in the shot
  • set zoom, focus, shutter speed and lighting
  • contrasting background
  • uncluttered
34
Q

how many cameras are needed for 2D analysis?

A

1

35
Q

how many cameras are needed for 3D analysis?

A

2 or more

36
Q

why might someones posture be different with knee pain?

A
  • pain itself can cause people to move differently
  • weakness in activation of muscles shown by EMG data
  • imbalance in quads (medial and lateral)
  • weakness around the glutes causing trendelenberg- changes Q angle of the femur
  • results in the patella tracking laterally instead of up and down
  • glides laterally and grinds on femoral surface causing pain and inflammation PATELLA FEMORAL SYDROME
37
Q

draw the distance speed and time triangle?

A 
distance= speed x time
time= distance/ speed
speed= distance/ time
38
Q

velocity=?

A

velocity= displacement/ time

39
Q

acceleration=?

A

acceleration= velocity/time

40
Q

trunk lean=

A

trunk weakness

41
Q

lateral pelvic tilt=

A

glute medius weakness (trendelenberg)

42
Q

knees close together=

A

glute medius weakness (trendeleberg)

43
Q

draw the spatial model

A

red- left
green-right
blue- middle

44
Q

define electromyography?

A

diagnostic procedure that evaluates muscle response or electrical activity in response to nerves stimulation of the muscle

Biomechanics Case Study (2 decks)

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