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My boards prep > Body Composition > Flashcards

Body Composition Flashcards

1
Q

What is body composition?

A

percentage of body weight comprised of fat vs fat free tissue

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2
Q

What are healthy ranges of body fat (M and F?)

A

Males 12-18%

Females 18-23%

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3
Q

What is hydrostatic weighing?

A

Immerse person in water and measure the amount of water that becomes displaced

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4
Q

How do you measure body fat with hydrostatic weighing?

A

use archimedes principle on the amount of water displaced

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5
Q

What is archimedes principle?

A

Volume and density of object will determine amount of water displaced.

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6
Q

Advantages of hydrostatic weighing

A

Can be used to measure bone density

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7
Q

Disadvantages of hydrostatic weighing

A

need to account for residual lung volume

patients must tolerate water submersion

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8
Q

What is the unit for BMI?

A

kg/m2

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9
Q

What are the values for underweight BMI?

A
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10
Q

What are the values for normal BMI?

A

18.5-24.9

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11
Q

What are the values for overweight BMI?

A

25-29.9

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12
Q

obese class 1

A

30-34.9

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13
Q

obese class 2

A

35-39.9

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14
Q

Skinfold measurement sites

A 
abdominal
Triceps*
Biceps
Chest/pectoral
medial calf
midaxillary
Subscapular*
suprailiac
Thigh

*most comonly used sites

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15
Q

What are healthy ranges of body fat (M and F?)

A

Males 12-18%

Females 18-23%

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16
Q

What is hydrostatic weighing?

A

Immerse person in water and measure the amount of water that becomes displaced

17
Q

How do you measure body fat with hydrostatic weighing?

A

use archimedes principle on the amount of water displaced

18
Q

What is archimedes principle?

A

Volume and density of object will determine amount of water displaced.

19
Q

Advantages of hydrostatic weighing

A

Can be used to measure bone density

20
Q

Disadvantages of hydrostatic weighing

A

need to account for residual lung volume

patients must tolerate water submersion

21
Q

What is the unit for BMI?

A

kg/m2

22
Q

What are the values for underweight BMI?

A
23
Q

What are the values for normal BMI?

A

18.5-24.9

24
Q

What are the values for overweight BMI?

A

25-29.9

25
Q

obese class 1

A

30-34.9

26
Q

obese class 2

A

35-39.9

27
Q

extreme obese class 3

A

> or = 40

28
Q

Skinfold measurement sites

A 
abdominal
Triceps*
Biceps
Chest/pectoral
medial calf
midaxillary
Subscapular*
suprailiac
Thigh

*most comonly used sutes

29
Q

What side of the body should skinfold measures be taken on?

A

Right

30
Q

When should you retest a site for skinfold?

A

if the difference between measurements is >1-2mm

31
Q

How far from the examiners finger should calipers be positioned?

A

1 cm

32
Q

how long should you wait before reading the caliper

A

1-2 sec

33
Q

What is bioelectric impedence analysis (BIA)?

A

a small electrical current is passed through the body to measure resistance and obtain the composition of water in the body

34
Q

What are the units for BIA

A

height2/resistance

35
Q

limitations of BIA

A

subject must be hydrated
pt must follow all guidelines of protocol (no food or drink for 4 hours, urinate within 30 min of test, avoid alcohol 48 hours before test, avoid vigorous activity 12 hours, avoid excess water intake)

36
Q

Waist circumference cutoff for high risk of DM II, HTN, CV disease (male and female)

A

Male: > 102 cm (40 in)
Female: > 88 cm (35 in)

37
Q

how to measure waist circumference

A

patient standing, measure around abdomen at level of iliac crests at end of normal exhale

38
Q

What happens to BMI risk category when waist circumference values are above cutoff?

A

consider patient 1 category above risk level determined by BMI

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