Body composition and image Flashcards
What is body composition?
Measures the amount and distribution of tissues within the body
What are the 5 levels of human body composition
- Atomic
- Molecular
- Cellular
- Functional/tissue-organ
- Whole body
What factors should be considered in assessing body composition
- Goal or the desired outcome in the individual or population being measured
- Desired level of accuracy and precision
- Validity of methods
2 compartment model
- Fat Mass and Fat free Mass
- FFM = anything that isn’t fat
3 compartment model
- Fat mass, total body water and fat free dry mass
- Controls for inter-individual variation in FFM hydration
4 compartment model
- Calculations of body fat and lean mass using equations
- Multiple body composition assessment methods
- Gold standard (Dexter scanner)
- Expensive
Total body fat definition
Refers to the total amount of body fat an individual has
Fat distribution definition
Refers to where the fat deposits are located
Methods of assessing body composition
- Anthropometric measurements
- BIA
- Bod pod
- DEXA
- MRI
Anthropometric indicies
- Weight/mass
- Height
- Circumferences
- Limb lengths
- Skinfolds
Visceral adipose tissue defintion
Fat stored within the abnormal cavity
BMI equation
weight/height2
Bioelectrical impedance
Impedance = opposition provided by body to electrical current
Conditions before completing the BIA
- No food for > 4 hours
- No exercise for 24 hours
- No alcohol for 48 hours
- No diuretic medication for 7 days
- Used standardised timing for female subjects (menstrual cycle)
Air Displacement Plethysmography-Bod Pod
Computerised pressure sensors determine the amount of air displaced by the person to calculate body density
