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Kin 157 > Slide 5 - Hydrostatic > Flashcards

Slide 5 - Hydrostatic Flashcards

1
Q

What Densitometry measure

A

Measurement of body density

Db = body mass/body volume

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2
Q

How is body volume measured

A

Hydrodensitometry

Air displacement

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3
Q

What is hydrodensitometry

What do we measure air displacement with

A

Underwater weighing

BodPod

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4
Q

How is % body fat calculated using these methods

A

Calculated from Db using equations

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5
Q

Hydropdensitometry has been used for

It measures

What is the principle based off

A

Decades in fitness facilities and research

mass per unit volume of persons body

Archimedes principle

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6
Q

What is archimedes principle

A

The buoyant force is equal to the weight of the displaced water

Loss of weight under water is directly proportional to the volume and weight of the water displaced by the body

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7
Q

Volume of an object submerged in water equals

A

The volume of water displaced by the object

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8
Q

The loss of weight under water is directly proportional to

A

The volume and weight of the water displaced by the body

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9
Q

Object submerged in water is acted on by

That is equal to

A

A buuoyancy force

The weight of water displaced by the object

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10
Q

Mass displaced =

A

Weight (air) - Weight(water)

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11
Q

Volume =

2 equations

A

Loss of weight in water / density of water

Or

Weight (air) - weight (water) / density of water

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12
Q

Db =

A

Total body weight in AIR / volume

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13
Q

When does the forumla work

What do we therefore have to additional corrections

A

When the object has no hollow spaces

Lungs and other trapped air spaces in body

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14
Q

What is residual lung volume

A

Air trapped in lungs after maximal expiration

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15
Q

Can we directly measure residual volume

A

NO

Can estimate based on sex, height and age

Or on % of vital capacity

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16
Q

How much approx is residual volume

What is the deviation in % body fat when using ESTIMATED RV

A

1 - 2 litres

1 - 4%

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17
Q

Is gastrointestinal gas larger or smaller than RV

What is it assumed to be

A

Smaller amount

100ml

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18
Q

How do you control gastrointestinal gas

A

With pre test diet

Avoid gas producing food or soda

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19
Q

What is the additional correction for working out:

Db =

A

Body weight in air
______________
((Weight in air - weight in water) / Density) - (RV + 0.1L)

20
Q

What are the assumptions made when doing hydrodensitometry

A

Separate densities of body compnents are additive

Densities of components are relatively constant from person to person
e.g. Density of fat = 0.9007 and FFM = 1.1000

Two component model:
Proportions of components in FFM are relatively constant from person to person
e.g. 73.8% water, 6.8% mineral, 19.4% protein

21
Q

What is the validity of hydrostatic weighing

A

Chemically determined body density agrees within 0.6% with Db

22
Q

What are the sources of error in hyrdrostatic weighing

A

Getting an accurate underwater weight

Value used for density of FFDb

Residual volume estimated

23
Q

Hydrodensitometry is based on what principle

A

Archimedes

24
Q

Body density is calculated by total body weight in air divided by body volume

A

True

25
Q

Residual lung volume is approximately 0.1L

A

False

26
Q

To correctly calculate the body volume, both the amount of water that is displaced and the density of water should be considered

A

True

27
Q

Hydrodensitometry follows a 3 component model assuming that the proportions of components in fat free mass are relatively constant from person to person

A

False

28
Q

A 30 year old women with body weight of 68 kg and height of 5’5’’ went through hydrostatic weighting assessment. The water temperature in the tank was 32 degree Celsius. What is the density of water

A

0.9951

29
Q

A 30 year old women with body weight of 68 kg and height of 5’5’’ went through hydrostatic weighting assessment. The water temperature in the tank was 32 degree Celsius. What is the estimated residual volume

A

1.467

30
Q

A 30 year old women with body weight of 68 kg and height of 5’5’’ went through hydrostatic weighting assessment. The water temperature in the tank was 32 degree Celsius. The density of water is 0.9951. What is her body density if her underwater weight was 1.0 and what is her % body fat

A

1.03589

28%

31
Q

A 30 year old women with body weight of 68 kg and height of 5’5’’ went through hydrostatic weighting assessment. The water temperature in the tank was 32 degree Celsius. Her % body fat was 28%. She wants to go through exercise training and lose weight. What is her desired body weight if she wants 20% body fat assuming that she wants to keep same amount of lean body mass

A

61.2kg

32
Q

A 30 year old women with body weight of 68 kg and height of 5’5’’ went through hydrostatic weighting assessment. The water temperature in the tank was 32 degree Celsius. She wants to go through exercise training and lose weight. Her desired body weight is 61.2kg. How much does she need to lose weight

A

6.8 kg

33
Q

One of the assumptions of hydrostatic weighing method for body composition assessment is that densities of components are relatively constant from person to person

A

True

34
Q

If underwater weight is measured higher that what it is, body density will be calculated higher and % body fat will be estimated higher

A

False

35
Q

If you are a trained (strength and resistance-based exercise training) individual, using Siri equation after hydrostatic weighing method to estimate % body fat may result higher value

A

True

36
Q

To evaluate _______ of the test, you will have another person measure on the same client

A

Objectivity

37
Q

What describes the amount air trapped in lungs after a maximal expiration

A

Residual volume

38
Q

The assumed amount of gas trapped in the gastrointestinal system when you use hydrostatic weighing method to assess body composition is approximately

A

0.1L

39
Q

Which method will you report the best represent your body composition

A

DXA

40
Q

Is hydrostatic weighing a more valid method than the skinfolds method.

A

True

41
Q

How do you calculate desired body weight using LBM

A

Actual LBM / desired % LBM

42
Q

How do you calculate RV for male and female

A

Male = 0.033 (ht inch) + 0.022(age) - 1.232

Female = 0.046 (ht inch) + 0.016(age) - 2.003

43
Q

How do you work out FM

A

Body fat % x BW

44
Q

How do you work out LBM

A

BW - FM

45
Q

What is the equation for SIRI

What is the equation for Brozek

A

((4.950 / body density) - 4.5) x 100

((4.570 / body density) - 4.142) x 100

Kin 157 (24 decks)

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