Body Composition Flashcards by Derya Anderson

What is body composition?

percentage of body weight comprised of fat vs fat free tissue

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

Males 12-18%

Females 18-23%

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What is hydrostatic weighing?

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

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How do you measure body fat with hydrostatic weighing?

use archimedes principle on the amount of water displaced

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What is archimedes principle?

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

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Advantages of hydrostatic weighing

Can be used to measure bone density

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Disadvantages of hydrostatic weighing

need to account for residual lung volume

patients must tolerate water submersion

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What is the unit for BMI?

kg/m2

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What are the values for underweight BMI?

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What are the values for normal BMI?

18.5-24.9

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What are the values for overweight BMI?

25-29.9

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obese class 1

30-34.9

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obese class 2

35-39.9

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Skinfold measurement sites

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

*most comonly used sites

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

Males 12-18%

Females 18-23%

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What is hydrostatic weighing?

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

How do you measure body fat with hydrostatic weighing?

use archimedes principle on the amount of water displaced

What is archimedes principle?

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

Advantages of hydrostatic weighing

Can be used to measure bone density

Disadvantages of hydrostatic weighing

need to account for residual lung volume

patients must tolerate water submersion

What is the unit for BMI?

kg/m2

What are the values for underweight BMI?

What are the values for normal BMI?

18.5-24.9

What are the values for overweight BMI?

25-29.9

obese class 1

30-34.9

obese class 2

35-39.9

extreme obese class 3

> or = 40

Skinfold measurement sites

``` abdominal Triceps* Biceps Chest/pectoral medial calf midaxillary Subscapular* suprailiac Thigh ``` *most comonly used sutes

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

Right

When should you retest a site for skinfold?

if the difference between measurements is >1-2mm

How far from the examiners finger should calipers be positioned?

1 cm

how long should you wait before reading the caliper

1-2 sec

What is bioelectric impedence analysis (BIA)?

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

What are the units for BIA

height2/resistance

limitations of BIA

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)

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

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

how to measure waist circumference

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

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

consider patient 1 category above risk level determined by BMI