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Kin 157 > Slide 6 - Air Displacement > Flashcards

Slide 6 - Air Displacement Flashcards

1
Q

Air displacement is what type of model

A

Two component model of body compositon

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2
Q

What is the equation for body density

A

Mass / volume

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3
Q

How is volume determined

A

By air displacement

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4
Q

What does the BodPod have to determine the amount of air displaced by the person

A

Pressure sensors

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5
Q

What law is the relationship between pressure and volume

A

Boyles Law

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6
Q

What does Boyles Law estimate

A

Body volume

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7
Q

Boyles Law states

Equation

What do we have to assume

A

Volume and Pressure are inversely related

P1V1 = P2V2
or
P1/P2 = V2/V1

Isothermal conditions

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8
Q

What is the methodology behind the air displacement

A

Isothermal conditions = Temp of air remains constant as its volume changes

Majority of the air in the enclosed bod pos is under Adiabtic conditions

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9
Q

What is adiabatic conditions

A

Temp of air does NOT remain constant as volume changes

Thus it will compress or expand as the temo changes within the chamber

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10
Q

What is the Poissons Law equation

What does it state

A

P1/ P2 = (V2/V1) v

The ratio of the specific heat of the gas at constant pressure to that of constant volume

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11
Q

What is the Body volume equation

A

Body volume (L) = Body volume (raw) - surface area artifact + 40% TGV

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12
Q

What does TGV stand for

Where is it measured

A

Thoracic gas volume

In the BodPod

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13
Q

What is the equation for body density

What equation do we use to estimate body fat %

A

Body mass / body volume

Siri equation

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14
Q

How do we minimise isothermal effect

A

Wear minimal clothing

Men:
Speedo etc

Women:
Form fitting clothing

Wear swim cap

Near skin surface

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15
Q

How long does it take for the BodPod to calibrate

A

30 min warm up for electronics

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16
Q

What does the BodPod have to go through in order to have good quality control

A

Analyze hardware
Calibrate scale
Autorun
Volume check - calibration cylinder

2 point calibration before each client

17
Q

What are the pre test measures of BodPod

A

No exercise, food or drink 3 hours before

Use restroom before test

Measure body mass 1 time

Measure body volume 2-3 times

Select daily activity level

Measure/predict TGV

18
Q

How do you work out TGV

A

FRC + 1/2 TV

19
Q

What errors may occur with BodPod

A

Airway pressure - high if puff too forcefully

Merit - high if air leaks

20
Q

When assessing body composition of each client in the Bod Pod, a 2-point calibration is performed by measuring the empty chamber of Bod Pod and the chamber with a 50 L calibration volume cylinder (and breathing tube) placed inside

A

True

21
Q

Like hydrostatic weighing, the Air Displacement Plethysmography using Bod Pod assesses body composition by determining the density of the body

A

True

22
Q

When using Bod Pod, correct height and weight measurements are needed to calculate body surface area

A

True

23
Q

Exhaling to maximal expiration is necessary to obtain an accurate measure of body fat when using the Air displacement plethysmography

A

False

24
Q

The air inside the chamber expands or is compressed as the temperature in the chamber changes describes isothermal conditions

A

False

25
Q

How does the Air Displacement Plethysmography assess body composition

A

By measuring changes in pressure within an enclosed chamber

26
Q

Air displacement plethysmography measures ______ component(s) model of body composition

A

2

27
Q

You are a 30 year old woman with body weight of 85.6kg and height 167.2cm. % body fat was determined using Bod Pod and it was 35%. Your current lean body mass is

A

85.6 x 0.65 = 55.64 Kg

28
Q

You are a 30 year old woman with body weight of 85.6kg and height 167.2cm. % body fat was determined using Bod Pod and it was 35%. If you want to reduce body fat to 28%, what is your target weight

A
  1. 6 x 0.65 = 55.64

55. 64 / 0.72 % = 77.3 kg

29
Q

Your result from Bodpod showed that your % body fat was 10.5% while DXA result showed 10.6%. This indicates that _____ regarding measurement concept

A

Air displacement plethysmorgraphy is a VALID technique to ASSESS body composition

30
Q

Air displacement plethysmography using Bodpod follows Boyle’s law because of the isothermal condition that the body creates in the chamber

A

False

31
Q

Air displacement plethysmography using Bodpod follows Poisson’s law because of the adiabatic condition that the body creates in the chamber

A

True

32
Q

Using Bodpod, body volume can be underestimated if your thoracic gas volume is higher than what it is

A

False

Kin 157 (24 decks)

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