Body Composition and Obesity Part 1 Flashcards
Most common measure of obesity?
BMI = kg/ m squared
BMI of a normal weight
18.5 - 24.9
What is body composition divided into (2)
Fat and fat free-mass
What is fat free mass
Everything that is not fat
What does the 3 compartment model consist of in imaging?
Fat mass, bone mass, lean mass (fat and bone free)
3 ways to get more detailed description of body composition
CT, MRI and dexa
What does the 4C model consist of?
Fat, skeletal muscle, organs and remaining soft tissues, minerals (all fat free mass)
Eight techniques of assessing body fat ( ABCCDTMs)
- Age, height and weight tables and weight prediction equations
- Cadaver analysis
- Densitometry
- Bioelectric impedance analysis (bia)
- Skinfold measurements
- Computed tomography. (CT scan)
- Magnetic resonance imaging (MRI)
- Total body density (dxa)
Most accurate body composition measurement
Cadaveric analysis, however it is very impractical. it takes direct measure of body tissues
Densotimotery
Density is proportional to our fat free mass. We are put into water or air compartments with known volume
BIA ( bioelectrical impedance analysis )
Electrical currents through the body works by how fast current travels, slower means more fat. Type we used in lab. Requires equations
What type of fat does skin folds measure
Subcutaneous
Sites of skinfold measures
Biceps, triceps, subscapular and supra-iliac, thigh, calf, andomen
CT scans (computed tomography )
( 4C model) gives off radiation. Expensive and time consuming. High density tissues (bone ) show up white and darker grey for low density (fat)
MRI (Magnetic Resonance Imaging)
4C model. Magnetic fields instead of radiation and is loud. Reverse shading than CT scan and is expensive and time consuming
