Body Composition

Question 1

Densitometry

Answer 1

hydrostatic weighing

plethysmography

Question 2

hydrostatic weighing

Answer 2

• measuring the amount of water displaced
• most widely used in labs
• limitations: need to account for residual lung volume during submersion
• standard error is 2-2.5%

Question 3

plethysmography

Answer 3

• calculates density of the body utilizing the amount of air displacement during testing within a specialized closed chamber
• change of pressure is converted to a percentage

Question 4

skinfold measurement

Answer 4

anthropometry
- all measurements should be taken on the right side
sites
- abdominal
midaxillary
triceps
subscapular
biceps
suprailiac
chest
thigh
medial calf

Question 5

Bioelectrical impedance analysis

Answer 5

uses an electric current and measures the resistance to the current flow

• no eating or drinking four hours prior
• no vigorous physical activity 12 hours prior
• urinate within 20 minutes
• avoid alcohol consumption 24 hours before

Question 6

BMI equation

Answer 6

weight (kg)/ height (m2) OR

weight (lbs)/ height (in2) x 703

Question 7

BMI classification for adults

Answer 7

< 18.5 underweight
18.5 - 24.9 normal
25 - 29.9 overweight
30 - 34.9 obesity class 1
35 - 39.9 obesity class 2
> 40 extreme obesity class 3

Question 8

BMI classification for children

Answer 8

• between 85th and 95th percentile for age and sex is considered at risk for becoming overweight
• BMI > 95th percentile is considered overweight or obese

Question 9

waist circumference

Answer 9

• measures waist to hip ratio
  an increased risk for type 2 diabetes, dyslipidemia, hypertension, and cardiovascular disease is associated with circumference > 102 centimeters (40 in) for men and > 88 centimeters (35 in) for women