The von Neumann Model – Chapter 4 COMP 2620 Dr. James Money COMP 2620 1.
Chapter 6 Body Comp
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Transcript of Chapter 6 Body Comp
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Body Composition
Forrest Dolgener, Ph.D.
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Body Composition Definitions
% Fat - percentage of total body weight that
is fat weight
Fat Weight - the weight of all the fat in the
body
Fat-Free Weight - the weight of everthing
that is not fat
Ideal Weight - the body weight at the
ideal % fat
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Body Weight = Fat Weight + Fat-Free Weight
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Computational Example
Weight = 200 lbs; % fat = 20%;
Fat Weight = 200 x .20 = 40 lbs Fat-Free Weight = 200 - 40 = 160 lbs
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Computing Ideal Weight
Ideal Weight = FFW / Ideal % FFW
Example
Body Wt = 180; %fat = 20%; What is ideal
body weight at 10% fat?
FW = 180 lbs x .20 = 36 lbs
FFW = 180 - 36 = 144 lbs
IBW = 144 / .90 = 160 lbs
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Components of Fat-Free Weight
Muscle
Bone
Organ Systems
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Components of Fat Weight
Essential Fat
most is non-visibleassociated with deeper body structures
Non-essential or Storage FatBeneath the skin and visible
Adipose tissue fat
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Gender Differences
Females are absolutely fatter than males
Female sex hormones promote fat deposition
Male sex hormones promote muscle growth
Most of the females increase in fatness is
due to an increase in the essential fat stores
Males and females have similar levels of
non-essential fat
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Gender Differences in Body Composition
Males Females
Body Weight 150 115
Total Fat 15% (22.5 lb) 25% (28.8 lb)
Essential Fat 3% (4.5 lb) 12% (13.8 lb)
Storage Fat 12% (18 lb) 13% (15 lb)
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15-18% 8-10%
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11/254-6% 4-6%
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Methods of Determining
Body Compostion Body Mass Index
Underwater Weighing (Hydrodensitometry)
Skinfolds
Bioelectric Impedance
Infrared Interactance
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Body Mass Index
BMI = (704.4 X weight)/(height in inches)2
A BMI between 16-25 is considered healthy
As BMI > 25, health risk increases
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Problems With BMI
Weight = 280 lbs
Height = 77 inches
%fat = 30% (obese)
BMI = 33 (obese)
Weight = 280 lbs
Height = 77 inches
%fat = 15% (healthy)
BMI = 33 (obese)
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Interpreting % Fat Values
All methods of measuring % fat have a
certain amount of inaccuracy! This
inaccuracy is determined by the StandardError of Estimate (SEE).
The SEE tells you the amount of deviation
from the true % fat you can expect from aparticular method.
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There is a 67% probability that the true %
fat is within + or - one SEE from themeasured value.
Example: Measure % fat = 20%;
SEE = 3 % units of body fat
There is a 67% probability that the
true % fat is between + or - one SEEor 3 % units of fat. or between 17 -
23 %.
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There is a 95% probability that the true %
fat is withing + or - two SEE from the
measured value.
Example: Measured %fat = 20%
SEE = 3 %There is a 95% probability that the
true %fat is within + or - two SEE or
6% of the measured value or 14 - 26%.
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SEE of Common Methods
Skinfolds - 3%
Bioelectric Impedance - 3%
Infrared Interactance - 5%
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Healthy Values for %Fat
Reasonable & Healthy %fat Range
Males: 10 - 20%
Females: 15 - 30%