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Lab 3. Skinfold Estimations of Body Composition. Skinfold Measurement. Is simple and relatively accurate Requires a minimal amount of equipment Can be used with a large number of subjects in a field setting Produces results within 3 to 5 percent of underwater weighing.

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## Lab 3

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**Lab 3**Skinfold Estimations of Body Composition**Skinfold Measurement**• Is simple and relatively accurate • Requires a minimal amount of equipment • Can be used with a large number of subjects in a field setting • Produces results within 3 to 5 percent of underwater weighing**Principle Behind Skinfold Measurement**• Fat or fat-free tissues accumulate in relatively predictable patterns. • If specific sites are measured, the size of such measurement will be influenced by the amount of the individual’s fat or fat-free tissue.**Equations/Calculations Slide 1Males (ages 18-61)**DB = 1.1093800 – (0.0008267 (X2)) + (0.0000016 (X2)2) – (0.0002574 (X4)) R = 0.91 SEE = 0.008 kg ∙ L-1 X2 = sum of chest, abdomen, and thigh skinfolds in mm X4 = age in yrs**Equations/Calculations Slide 2Females (ages 18-55)**DB = 1.0994921 – (0.0009929 (X3)) + (0.0000023 (X3)2) – (0.0001392 (X4)) R = 0.84 SEE = 0.009 kg ∙L-1 X3 = sum of triceps, thigh, and suprailium skinfolds in mm X4 = age in yrs**Equations/Calculations Slide 3**% FAT = (((4.57 / DB) – 4.142) x 100) Fat Weight = Body Weight x (% FAT / 100) Fat-Free Weight = Body Weight – Fat Weight Body Weight Goal = FFW / (1 – (Target % FAT / 100))**Skinfold Estimation Example 1**170-pound 22 year-old male Skinfold measures: • Chest = 10 mm • Abdomen = 20 mm • Thigh = 15 mm Target % FAT = 10**Example 1, Slide 2**DB = 1.1093800 – (0.0008267 (45)) + (0.0000016 (45)2) – (0.0002574 (22)) = 1.07461 kg · L-1**Example 1, Slide 3**% FAT = (((4.57 / 1.07461) – 4.142) x 100) = 11.1 Fat Weight = 170 x (11.1 / 100) = 18.87 Fat-Free Weight = 170 – 18.87 = 151.13 Body Weight Goal = 151.13 / (1 – (10 / 100)) = 168**Skinfold Estimations Example 2**140-pound 22 year-old female Skinfold measures: • Triceps = 12 mm • Thigh = 17 mm • Suprailium = 18 mm Target % FAT = 15**Example 2, Slide 2**DB = 1.0994921 – (0.0009929 (47)) + (0.0000023 (47)2) – (0.0001392 (22)) = 1.0507 kg · L-1**Example 2, Slide 3**% FAT = (((4.57 / 1.0507) – 4.142) x 100) = 20.7 Fat Weight = 140 x (20.7 / 100) = 28.98 Fat-Free Weight = 140 – 28.98 = 111.02 Body Weight Goal = 111.02 / (1 – (15 / 100)) = 131

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