Body Composition

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Body Composition - PowerPoint PPT Presentation

Body Composition . By Connie Rauser Sabino High School http://edweb.tusd.k12.az.us/crauser. BMR (basal metabolic rate). Amount of energy your body needs to function at rest. BMR Calculations. General Formula Your weight in lbs x 10 kcals/lb Harris-Benedict formula

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Body Composition

By

Connie Rauser

Sabino High School

http://edweb.tusd.k12.az.us/crauser

BMR (basal metabolic rate)
• Amount of energy your body needs to function at rest

Body Composition

BMR Calculations
• General Formula
• Your weight in lbs x 10 kcals/lb
• Harris-Benedict formula
• Adult male: 66 + (6.3 x B. W. in #) + 12.9 x Height in inches) – (6.8 x age)
• Adult female: 655 + (4.3 x B. W. in #) + (4.7 x Height in inches) – (4.7 x age)

Body Composition

BMI
• What is BMI?
• Relationship of weight to height
• Used to assess:
• Underweight
• overweight or risk for overweight
• Above 95th percentile-overweight children
• 30 and above-obese
• Does not measure body fat

Body Composition

Calculating BMI
• BMI = W (kg) divided by H2 (meters)
• BMI = W/H2
• BMI = (W (lbs) x 705)/H (in)2
• BMI = (W x 705)/H2

http://www.cdc.gov/nccdphp/dnpa/bmi/calc-bmi.htm

Body Composition

Lean Muscle Mass vs. Body Fat
• Lean body weight
• Composed of muscle, tendons, bones, connective tissue
• Percentage of body fat
• Amount of fat tissue in body
• Determines how much weight can be lost
• Average college male = 12 – 15%
• Average college female = 20 – 25

Body Composition

What does it look like?
• 1# of body fat
• Lean body mass

Body Composition

Methods for Calculating Body Fat#1
• Skin fold calipers (skinfold thickness)
• Measure the subcutaneous fat layer
• Measure at least 3 sites
• Error of skinfold is 3-3.5%
• As high as 5%

Body Composition

Method #2
• Bioelectrical impedance
• Uses electrical conductivity to estimate fat-free mass
• Muscle holds more water
• Dehydration will cause high % reading
• Error is similar to skin fold test

Body Composition

Method #3
• Hydrostatic weighing (underwater)
• “Gold Standard”
• Underwater weighing with expiration of all air in lungs
• Error of 2-2.5%

Body Composition

Hydrostatic weighing
• 1- residual lung

volume established

• 2-Athlete placed

on scale

• 3-After exhaling all air,

athlete is submerged

for weighing

• 4-Analysis and tests

are provided

Body Composition

Skin fold Method
• Grasp dry skin between thumb and index finger
• Hold the skin ½ inch above site
• Caliper is held perpendicular to fold
• Release grip on caliper
• Dial is read to nearest 1 mm, 1-2 seconds after release
• Minimum of 2 measurements, 1mm variance

Body Composition

Sites for Males & Females
• Chest
• Diagonal fold ½ the distance between the anterior axillary line (crease of underarm) and nipple
• Subscapular
• Diagonal fold 1-2 cm below the inferior angle of the scapula
• Midaxillary (pectoral)
• Vertical or horizontal fold midaxillary line at level of xiphoid process

Body Composition

Sites for Males & Females
• Suprailiac
• Diagonal fold above the iliac crest at anterior axillary line
• Abdomen
• Vertical fold taken 1 inch to right side of umbilicus
• Triceps
• Vertical fold halfway between the acromion and olecranon processes on posterior midline

Body Composition

Sites for Males & Females
• Thigh
• Vertical fold on anterior midline of thigh midway between proximal border of patella & inguinal crease
• Biceps
• Vertical fold on anterior aspect of arm over belly of muscle 1 cm above level used to mark triceps
• Calf
• Vertical fold at maximum circumference of calf on midline of medial border

Body Composition

Body Density Calculations for Males
• Body Density = 1.1093800 – 0.0008267(sum of 3 skinfolds) + 0.0000016(sum of 3 skinfolds)2 – 0.0002574(Age)

(chest, abdomen, thigh)

• Body Density = 1.1125025 – 0.0013125(sum of 3 skinfolds) + 0.0000055(sum of 3 skinfolds)2 – 0.0002440(Age)

(chest, triceps, subscapular)

Body Composition

Body Density Calculations for Females
• Body Density = 1.0994921 – 0.0009929 (sum of 3 skinfolds) + 0.0000023(sum of 3 skinfolds)2 – 0.0001392(Age)

(triceps, suprailium, thigh)

Body Composition

Body Fat Equations
• Brozek:
• % Body fat = [(4.57/BD)-4.142] x 100
• Siri:
• % Body fat = [(4.95/BD) – 4.50] x 100
• Females Only
• Percent Body Fat (YMCA) = .41563(sum of 3 skinfolds) - .00112(sum of 3 skinfolds)2 + .03661(Age)

(triceps, abdomen, suprailium)

Body Composition

Body fat calculations
• Go the the following website
• www.ExRx.net

Body Composition