Lab Test 2 (lab 5) Flashcards
Two names for UWW
underwater weighing
hydrostatic weighing
UWW is this type of model
2 compartment model
what are the two compartments
fat weight / fat-free weight
T/F: UWW is the gold standard and criterion method(measure)
T
UWW is the best method yet to do this
measure body composition
standard error of estimate for UWW
+or- 2%
Three types of anthropometric measurements
skinfolds
circumferences
diameters
Benefits of anthropometric measurements
portable
standard error of estimate for anthropometric measurements
+ or - 5%
Why measure body comp 3
health implications
body weight recommendations
describe populations
T/F: risk of diabetes often exhibits unique fat distribution
T
must know body comp factors to accurately and safely make body weight recommendations, athletic or otherwise is an example of
why measure body composition
what is a major drawback of body weight recommendations that are made using height and weight tables
do not consider FFW vs FW
Why would you want to use body comp to describe populations
determine risk factors for ethnic groups, sexes.
Determine body comp of athletic populations
fat component of UWW is composed of this
adipose and neural tissue
two basic forms of adipose tissue
subcutaneous
intermuscular and/or intravisceral
density of FW
0.90 g/ml (kg/L)
This is defined as collective term consisting of bone, muscle, tendons, viscera, connective tissue, etc
FFW or FF component
Density of FFW
1.1 g/ml (kg/L)
FFW density is considered this
collective density
symbol for body density
Dsub(b)
Body density range
0.90000 - 1.10000 g/ml
when working with body density always round calculations to this value
0.00000 or 1/10,000
energy content of fat
approx 9kcal/g
3 examples of positive features of fat
needed in neural development of infants, toddlers and adolescents
insulation
protection
essential fat for males
3-5%
desirable fat for males
10-15%
essential fat for females
10-12%
desirable fat for females
15-20%
Reasons women need more body fat than men
reproductive functions such as estradiol and progesterone production
Healthy fat % range in males (overall)
10-20%
healthy fat % range in females (overall)
20-32%
density =
mass/volume
T/F: we are solving for body density when doing UWW
F, body volume
We use UWW to determine this , which allows us to calculate this
body volume, which allows us to calculate body density
From body density we can calculate this
%FAT
What is the equation to calculate % fat
brozek’s equation
a body submerged in water will lose an amount of weight proportional to its bodies volume
archimedes principle
We need to account for this in the lungs with UWW
residual volume of air
air is in these two places of the body
lungs
gastrointestinal tract
RV can be estimated from this
Vital capacity
The volume of air left in the lungs after maximal expiration
residual volume
the maximal volume of gas that expelled from the lungs voluntarily following a maximal inspiration
vital capacity
volume of air left in the GI tract
0.10 L
must know these three variables for UWW
water temp
spirometer air temp
tare weight
See last page of Lab 5 notes for steps for determining % body fat from UWW
okay
