Week 10 - Intro to Body Composition Flashcards
What comes under the basic model 2-C
FM
FFM
Location for bicep SKF
Point on anterior surface of arm, level of mid-acromiale-radiale landmark in middle of muscle belly.
Arm in mid-prone position w/ thumb pointing forwards.
Location for abdominal SKF
5cm lateral to umbilicus.
Standing on a relaxed position.
Assumptions of the 2C model
Density of FM = 0.9 g/ml
Density of FFM = 1.1 g/ml
FM + FFM densities are the same for all ind.
Densities of various components of FFM are constant w/in ind
Ind being measured differs from a reference body in only amount of fat.
List the different levels of body composition in order of increasing organisational complexity
Atomic
Molecular
Cellular
Tissue
Whole body
TYPICAL BODY COMPOSITION
Muscle in F + M
F = 36%
M = 45%
Body fat % for females of average population of 50 yrs +
16-25%
Location for Tricep SKF
Point on posterior surface of arm in midline at level of mid-acromiale-radiale landmark.
Arm in mid-prone position w/ thumb pointing forwards.
Location for medial calf SKF
Point on most medial aspect of calf at level of max girth.
Location for subscapular SKF
2cm from undermost tip of inferior angle of scapula along line running 45 degrees.
What fold type is there at the iliac crest
Near horizontal
Describe a gynoid body shape
Excess fat mainly on lower body
Location for proximal calf SKF
Posterior aspect of calf in mid-sagittal plane 5cm inferior to fossa poplitea.
TYPICAL BODY COMPOSITION
Nonessential fat in F + M
F = 15%
M = 12%
How is FFM calculated
Total weight - Fat mass
What is Kinanthropometry
Area of science concerned w/ the measurement of human body composition.
Body fat % for females of average population from ages 30-50
15-23%
Describe an android body shape
Excess body fat on upper body + trunk.
How is the FFM index calculated (FFMI)
FFM (kg) / (height (m)^2)
Location for iliac crest SKF
Most superior aspect of iliac crest at mid-axillary line.
Fold right arm across chest.
TYPICAL BODY COMPOSITION
Other in F + M
Both 25%
Body fat % + classifications
Provide F + M for an overweight rating
F = 31-36%
M = 21-24%
What do the fat depots of non-essential/storage fat include?
Adipose tissue
Visceral fatty tissues
== both subcutaneous fat
Body fat % + classifications
Provide F + M for an obese rating
F = >37%
M = >24 %
SKF types for:
Proximal calf
Forearm (lateralis)
Forearm 2 (Volaris)
Vertical
BMI classification for obese class II
35-39.9
What is body composition
Relative prop. of FFM, FM, protein, water + mineral components in the body.
Method for taking SKF
- Record subjects age, stretched height, weight + gender.
- Using measuring tape, mark skin fold sites on RIGHT side of body.
- Ensure muscles relaxed.
- Using thumb + forefinger, grasp tissue at marked site so that double layer of subcutaneous fat + skin is obtained.
- Hold calliper perpendicular to subjects body, measure thickness of centre of fold 1cm away from edge of thumb + forefinger.
- Release pressure of fingers from skin fold but don’t release fingers touch from subjects skin.
- Place calliper 1cm below marking
- Let calliper measure site for no more than 2 sec + record reading.
- Measure each site 1 time through + repeat once more for min of 10% variation.
What are the sites for collecting SKF
Bicep
Tricep
Subscapular
Abdominal
Iliac crest
Supraspinale
Front thigh
Medial calf
Body fat % for females of average population up to the age of 30
14-21%
Body fat % + classifications
Provide F + M for an acceptable rating
F = 24-30%
M = 15-20%
What fold type is there at the front thigh
Vertical
What fold type is there at the tricep
Vertical
TYPICAL BODY COMPOSITION
Bone in F + M
F = 12%
M = 15%
BMI classification for Overweight
25-29.9
What fold type is there at the abdominal
Vertical
What fold type is there at the supraspinale
Diagonal
Location for front thigh SKF
Anterior thigh 1/2 distance between inguinal fold + superior patellar border.
BMI classification for normal weight
18.5-24.9
Location for supraspinale SKF
Above iliac crest on anterior axillary line.
Arm in mid-prone position
What must you not do when taking SKF
Incorporate underlying muscle tissue
What fold type is there at the bicep
vertical
What are the 3 sites req for skeletal mass estimates
Proximal calf
Forearm (lateralis)
Forearm 2 (Volaris)
What are the 2 body shapes according to fat distribution?
Android (apple-shaped)
Gynoid (pear-shaped)
What are the common anatomic sites for subcutaneous fat
Triceps
Subscapula
Iliac crest
Mid abdomen
Upper thigh
BMI classification for obese class III
> 40
Body fat % for males of average population between 30-50 yrs
11-17%
How is FFM calculated
Weight (kg) x ( 1- (body fat % / 100))
Where should the centre of fold be in taking SKF?
1/2 the distance between peak of skin fold + base of skin fold.
Body fat % + classifications
Provide F + M for an athletic rating
F = 8-15%
M = 5-10%
Which of the 2 body shapes is more associated w/ greater disease risk
Android body
Body fat % for males of average population for 50yrs +
12-19%
What fold type is there at the medial calf
Vertical
When taking SKF, what size should the fold be?
Sufficient enough to ensure 2 folds are parallel
Location for forearm 2 (volaris) SKF
Taken at level of max. forearm girth taken on anterior aspect of forearm w/ hand supinated.
Why is body composition important
Estimate healthy body composition of the public
Estimate competitive composition for athletes
Monitoring growth + development
ID pop at risk due to under or over fatness
Assessing changes associated w/ ageing, malnutrition + certain diseases
Formulating + examining the effectiveness of nutrition + exercise interventions.
Essential fat
Req. for normal physiological functioning
Fat stored in major organs, muscle + CNS
Important for childbearing + hormone-related functions
Extreme diet/exercise cond. can reduce essential fat stores to critical levels.
TYPICAL BODY COMPOSITION
Essential Fat in F + M
F = 12%
M = 3%
Location for forearm (lateralis) SKF
Taken at level of max. Forearm girth on lateral aspect of forearm w/ hand supinated.
Body fat % + classifications
Provide F + M for a good rating
F = 16-23%
M = 11-14%
BMI classification for underweight
<18.5
BMI classification for obese class I
30-34.9
Where can the fat depots be found in men?
Subcutaneous
Intermuscular
Intramuscular
Abdominal + thoracic cavity
Body fat % for males of average population up to the age of 30
9-15%
What % of 12% non-essential fat in F is called sex-specific reserve storage fat + where is it found?
5-9%
Contained in breast + genital regions, lower body subcutaneous fat + intramuscular depots.
How do you calculate BMI
Weight (kg) / Height (m)^2
What fold type is there at the sub scapular
diagonal
Medial calf SKF
What position?
In relaxed standing position w/ right foot on box + knee bent at 90.
Subscapular SKF
What position?
Arm in mid-prone position, w/ thumb pointing forwards
Thigh SKF
What position?
Seated w/ right leg extended + hamstring supported w/ arms.