Body Comp Assessment Flashcards
What does BMI involve?
Height and weight (kg/m^2)
Overweight = 25-29
Obese 30 or more
What will girth measurements determine?
Relative fatness for different populations. Good for determining patterns of fat distribution.
Fat-free body mass (FFM)
All residual lipid-free chemicals and tissues, including water, muscle, bone, CT, internal organs
Lean body mass (LBM)
FFM PLUS essential body fat
Relative body fat %
FM expressed as a % of total body mass
Why is BMI not really accurate?
It doesn’t account the body composition.
In general do women or men have more body fat?
Women
Fat helps with…
Nerves and body function
How many times more should women have in body fat than men?
4x
Skinfolds measured with calipers by
Skin plus subcutaneous fat
Plus in different equations to determine body comp
Potential errors involved
What is the gold standard for body composition?
DEXA
What does skinfold measures
Skin fold thickness, subcutaneous ad visceral fat to figure out body fat
Best way to measure with bioelectrical impedance analysis (BIA)
Laying down with electrodes on hands and feet
BIA resistance influences…
More fat more resistance More lean mass travels less resistance Hydration status More water lower body fat Skin temperature
Hydrostatic Weighing computes body volume as the difference between…
Body mass measured in air and
Body weight measured during water submersion
*Body volume equals loss of weight in water
What happens when you don’t blow air all the way out and don’t account for it?
Accounts for fat due to the residual volume (RV)
5% error
CT uses…
Radiation
Bod Pod
Measures body volume and know weight in order to calculate for density
Leptin
Crucial hormone in BW regulation
- how much one eats
- how much energy one expends
Ultimately one’s BW
What happens when there’s an absence in leptin?
Continual hunger and marked obesity
Adipocyte Hypertrophy vs Hyperplasia
Hypertrophy - existing adipocytes enlarge or fill with fat
Hyperplasia - total adipocyte # increases
Leptin pathway
Leptin moves from fat cells into bloodstream and signals hypothalamus to reduce or stop the drive to eat
The number of adipocyte cells is mainly created during
Childhood
