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HBIO 205 Lab Test |Questions with Complete Solutions
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HBIO 205 Lab Test |Questions withComplete Solutions
Direct Assessment of Body Comp - ✔-achieved only through chem analysis or dissection
or cadaver
7 indirect assessments - ✔1. Height/weight
2. BMI
3. Girth
4. Waist to Hip Ratio
5. Skinfold
6. Bioelectrical Impedance
7. Hydrostatic Weighing
4 predict body fat % - ✔-skinfold
-hydrostatic weighing
-girth
-BIA
3 predict health risk assocation - ✔
1. Height Weight - ✔- 40% of individuals could be incorrectly
classified -frame size
-equation given
2. BMI - ✔-uses height and weight to classify as underweight, normal, or over
,-accepted in clinical setting
-higher the BMI more risk of obesity
-equation:
=weight (kg) / height (m)^2
m = inches x .0254
3. Girth Measurement - ✔-used to estimate % body weight
4. WHR - ✔-determines fat pattern type (apple vs. pear)
5. Skinfold - ✔-measures subcutaneous fat to predict % body
fat -half of total fat is located subcutaneously
-ideal body weight from skinfold
equation: = FFM / 1.0 - ideal % bodyfat
Calculate Body Body Fat: Siri Equation - ✔Siri % Fat:
(495/Db) - 450
6. Bioelectrical Impedance Analysis (BIA) - ✔-estimates % body
fat -low level electrical current through body
-hydration affects this test
-measures body resistance (impedance) to electrical current and estimates total body water
BIA hydration - ✔-dehydration:
a. decrease in conductivity
b. overestimates 3-5%
, -hyperhydration
a. underestimation of body fat
7. Hydrostatic Weighing - ✔-gold standard of body
comp -Archimedes principle of water displacement
-uses
a. body volume determined by bodyweight lost by immersion in water (underwater body
mass = BMw)
b. body density Db (calculated by bodyweight in air BMa / body volume
c. Residual Lung Volume
d. density of water Dw and volume of intestinal gas (Vgi)
7. BMw = - ✔"best" underwater weight value - tare weight
7. Density (big equation) - ✔-denominator is body
volume -BMa = body mass in air (kg)
-BMw = body mass in water (kg)
-Dw = water density based on water temp
(g/ml) -RV = estimated residual volume (L)
-VGI = estimated intestinal gas (L) = 0.1 L
Lab 2: Aerobic Capacity - ✔-aerobic energy
production -using VO2max as measure of aerobic
capacity
-direct measurements of VO2max and advantages/disadvantages
-VO2max prediction w/ Astrand Rhyming Test
-VO2max in absolute units (L/min) vs. relative units (ml/kg/min)
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