Chapter P, Problem 25E

Lean Body Weight in Females This is a continuation of Exercise 24. The text cited in Exercise 24 gives a more complex method of calculating lean body weight for young adult females:

$L=19.81+0.73W+21.2R-0.88A-1.39H+2.43F$

Here $L$ is the lean body weight in pounds, $W$ is the weight in pounds, $R$ is wrist diameter, $A$ is the abdominal circumference in inches, $H$ is hip circumference if inches, and $F$ is forearm circumference in inches. According to this formula, what is the approximate lean body weight of a young adult female who weighs $132$ pounds and has wrist diameter of $2$ inches, abdominal circumference of $27$ inches, hip circumference of $37$ inches and forearm circumference of $7$ inches? What is the weight of her body fat? What is her body fat percent?

Lean Body Weight in Males A person’s lean body weight $L$ is the amount that he or she would weigh if all body fat were marginally to disappear. One text gives the “equation that practitioners can use most feasibly in the field to predict lean body weight in young males.” The equation is

$L=98.42+1.08W-4.14A$

Here $L$ is the lean body weight in pounds, $W$ is the weight in pounds and $A$ is the abdominal circumference in inches. Find the approximate lean body weight of a young adult male who weighs $188$ pounds and has an abdominal circumference of $35$ inches. What is the weight of his body fat? What is his body fat percent?