Question

in order to determine body composition with bioelectrical impedance, you must also know
a height, weight, gender, and percentage of body fat
b age, gender, and lean muscle mass
c height, age, weight, and gender
d bmi, age, and gender
please select the best answer from the choices provided

Explanation:

Bioelectrical impedance analysis (BIA) is a method to estimate body composition. It works by sending a small electrical current through the body. Since lean tissue (which has a high water and electrolyte content) conducts electricity better than fat tissue (which has low water content). To accurately calculate body composition (like fat - free mass and fat mass) using BIA equations, factors such as height (to account for body size and segment lengths), age (as body composition changes with age, for example, muscle mass tends to decrease with age), weight (a basic measure of body size), and gender (as men and women have different typical body compositions, such as men having more muscle mass on average) are required.

• Option A: Percentage of body fat is what we are trying to determine, not an input. So A is wrong.
• Option B: Lean muscle mass is an output of body composition analysis, not an input. So B is wrong.
• Option D: BMI (Body Mass Index) is a simple ratio of weight to height squared and does not directly account for factors like age and gender in the sophisticated way BIA equations do. So D is wrong.

Answer:

C. height, age, weight, and gender