Case Study II: Body Composition Assessment and Weight Management Susan is a secr

Question

Case Study II: Body Composition Assessment and Weight Management Susan is a secretary who has been sitting behind her desk at work for the last 20 years. Over the years, she has gradually gained weight because of her sedentary lifestyle and changing metabolism. She contacted you to assess her body composition and to plan a weight-management program. Her body composition and nutritional assessments resulted in the following data: Client: 45-year-old female %BF-34% Body weight: 160 lb (72.6 kg) Desired %BF: 3096 Height: 65 in. (165.1 cm) Daily caloric intake: 3,000 kcal 3SKF: 86 mm BIA resistance: 610 ohms |Dietary analysis: 40% carbohydrate, 15% protein, 45% fat BIA reactance: 70 ohms Questions Activity level: light 1. 2. 3. Calculate Susan's body mass index. (1 point) Classify her level of fatness using BMI. (1 point) Use the body composition method to calculate the client's target body weight. (5 points) How many grams of protein does this cdient consume per day? How does this value compare to the recommended daily protein need of this client? (5 points) How would you alter the relative percentages of macronutrients in this client's diet? (3 points) 4. 5.

Explanation / Answer

Ans:

1. Body mass index(BMI) is a measure of body fat based on height and weight

It can be calculated using the formula BMI = Kg/m2,

the body weight given in the problem is 72.6kg and height 165.1cm that is 1.65m

therefore, BMI = 72.6/ (1.65)2  = 26.66.

so susan's body mass index is 26.6

2. Level of fatness is classified according to the chart given below

BMI of < 18.4 is underweight

BMI of 18.5- 24.9 is healthy weight

BMI of >25 is overweight

Susan's BMI is 26.6 so she is overweight

3. To calculate target weight by body composition method.

can be calculated using the formula = Lean body mass/ (1- desired body fat percentage)

Lean body mass is the body mass without any fat can be calculated as Lean body mass = current body weight - current body weight * current body fat percentage

susan body weight is 72.6kg and 45% of body fat, so

Lean body mass can be calculated as Lean body mass = 72.6 - 72.6* .45 = 39.93kg

Desired body fat can be selected based on the % of fat that a fit individual will have and it is 14-15% for men and 21-24% for women. so for susan it will be in between 21- 24% and lets say it is 23%. Now target body weight of susan can be calculated as

Target body weight = lean body mass / ( 1- desired body fat percentage ) = 39.93 / (1- 0.23) = 51.8kg

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