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Kin 147 > Week 11 > Flashcards

Week 11 Flashcards

1
Q

What can be measured cheaply in field

A

2D motion capture

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2
Q

What is expensive to do in field

A

3D motion capture

Force plates

Electromyography

Dynamometry

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3
Q

What are some wearable sensors

A 
Skin patches
Smart watches
Headbands
Mobile and tablet applications
Giomechanical shoe insoles
Smart garments
Inertial measure unit
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4
Q

Wearable sensors can be worn

They often have

Compatible with

A

During normal activities

Dataloggers - store data within the device

Smart phone apps, computer programs for viewing and data analysis

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5
Q

Wearable sensors usually are

A

Electromyography

Acceleratometers

IMU sensors

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6
Q

What is an accelerometer

A

Measures linear accelerations in 1 to 3 planes of motion

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7
Q

In lab how many planes do our accelerometers measure

A

3 planes

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8
Q

What is a gyroscope

A

Measures angular acceleration in 1-3 planes of motion

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9
Q

What is a magnetometer

A

Measures magnetic fields and can be used to measure orientation relative to the earths magnetic field

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10
Q

IMU are

A

Inertial measurement unit

A combination of an accelerometer and gyroscope, sometimes magnetometer

Allows you to measure both linear and angular accelerations, as well as orientation

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11
Q

Smart phones contain

A

All 3 measurements devices

Plus GPS

These sensors are accessed and utilised by a variety of apps

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12
Q

On a accelerometer, what is vertical, anterior posterior and medial lateral

A

X = vertical

Y = anterior posterior

Z = medial/lateral

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13
Q

Accelerometer can detect

A

Gravity

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14
Q

Accelerometer measures in what unit

A

1 g = 9.8 m/s^2

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15
Q

What is peak positive acceleration (PPA)

Can measure what if placed at bottom of tibia

How is this related to risk of injury

A

Peak vertical acceleration in the positive direction during running or other task

Measurement of tibial shock if placed directly above ankle

Higher numbers mean more force at the tibia, increasing risk of injury

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16
Q

Each peak on a accelerometer graph is a

A

PPA

17
Q

Gait retraining research shows that

A

PPA of the tibia, vertical force impact peak and average and instananeous vertical force loading rates were all reduced immediately

Decrease in 50% tibial acceleration

Vertical force impact peak decreased by 20%

Vertical force loading rates decreased by 30%

18
Q

How did they reduce the factors in gait retraining research

A

Increasing cadence

Landing softer

19
Q

Overall what different things can accelerometers be used to measure

A

Tibial shock

Running or cycling cadence

Retraining poor biomechanics

Quantifying balance deficits after injury

All can be done cheaply and remotely

20
Q

Measures absolute orientation relative to the Earth’s magnetic field

A

Magnetometer

21
Q

Combines information from 2 or 3 of the other tools into 1 piece of equipment

A

Inertial measurement unit

22
Q

Measures linear accelerations in 1-3 planes

A

Accelerometer

23
Q

Measures angular accelerations in 1-3 planes

A

Gyroscope

24
Q

Motion capture systems cannot be brought outside to perform 3D motion analysis

A

False

25
Q

Any new smartphone will contain an accelerometer, gyroscope, and magnetometer

A

True

26
Q

Assuming the following definitions
X = vertical
Y = anterior/posterior
Z = medial/lateral

And, that the accelerometer is positioned perfectly vertical, what measurements should be recorded in the x-direction

A

1 g

27
Q

Which of the following data can you not obtain with an accelerometer

A

Peak angular acceleration of the segment the accelerometer is placed on

28
Q

We would expect to find higher medial / lateral acceleration of the trunk after a participant has suffered a concussion

A

True

29
Q

What does it mean that a wearable device has a datalogger function

A

Data is stored in the device, even when not in wireless range of your computer

Kin 147 (12 decks)

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