Question

A 45-year-old woman named Christine is measured as having the following skinfold thicknesses on the right side of her body: Triceps: 11mm; Thigh: 19mm; Suprailium: 11mm. Estimate her body fat percentage. (Answer to one digit after the decimal point.)

Answer 1

To estimate Christine's body fat percentage, we can use the skin-fold test method. Based on the measurements provided, the sum of skinfold thicknesses is 41mm. Using a body fat percentage prediction equation for a 45-year-old woman, her estimated body fat percentage is approximately 22.8%.

Step-by-step explanation:

To estimate Christine's body fat percentage, we can use the skin-fold test method. This method involves measuring the thickness of skinfolds at different locations on the body. Based on the measurements provided, we can calculate the sum of skinfold thicknesses.

Sum of skinfold thicknesses = Triceps + Thigh + Suprailium = 11mm + 19mm + 11mm = 41mm.

Next, we can use a body fat percentage prediction equation that takes into account the sum of skinfold thicknesses, age, and sex. Given that Christine is a 45-year-old woman, the equation to use is:

Body fat percentage = 0.2967 x sum of skinfold thicknesses - 0.00043 x (sum of skinfold thicknesses)^2 + 5.763 x age - 76.765.

Plugging in the values:

Body fat percentage = 0.2967 x 41 - 0.00043 x 41^2 + 5.763 x 45 - 76.765 = 22.824%.

Therefore, we estimate Christine's body fat percentage to be approximately 22.8%.