Body Composition

Question 0

How much of the human body is made up of water?

Answer 0

Over 70%

Question 1

What do we want to know when considering body composition?

Answer 1

How much fat?
How much muscle?
How much bone?

These are anatomical considerations that demand different approaches

Question 2

What 6 elements make up 99% of the mass of the human body?

Answer 2

Oxygen (65%)
Carbon (18.5%)
Hydrogen (9.5%)
Nitrogen (3.2%)
Calcium (1.5%)
Phosphorus (1.0%)

Question 3

Name some trace elements of the human body

Answer 3

Potassium, sulfur, sodium, magnesium

Question 4

Name the 3 body composition models

Answer 4

• two compartment model
• three compartment model
• four compartment model

Question 5

What does the two compartment model involve?

Answer 5

Fat and non fat measurements

Question 6

What does the three compartment model involve?

Answer 6

Fat mass
Fat free dry mass
Total body water

Question 7

What does the four compartment model involve?

Answer 7

Fat mass
Fat free mass (non bone mineral)
Bone mineral mass
Residual

Question 8

What methods are used to determine body composition?

Answer 8

Anthropometry
Densitometry
(water displacement, underwater weighing, air displacement (bodpod))
Bio-impedance (body composition can be estimated from the magnitude of the electrical conductivity)
Medical imaging techniques (DXA, CT scan, MRI, ultrasound)
Chemical techniques

Question 9

The approx percentage of fat free mass (FFM) is?

Answer 9

72% water
21% protein
7% bone mineral

Question 10

The approx percentage of fat mass is?

Answer 10

20% water

80% adipose tissue