ACE Health Coach Certification Practice Test

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Which of the following is NOT a means of measuring body-fat percentage?

hydrostatic weighing
skinfold measurements
bioelectrical impedance
body mass index

The correct answer is: body mass index

Body mass index (BMI) is a widely used screening tool that estimates body fat based on an individual’s height and weight. However, it does not measure body fat percentage directly. Instead, it calculates a number that categorizes individuals into weight classifications (underweight, normal weight, overweight, and obese) but does not provide insights into actual body composition, such as the proportion of fat versus lean mass. On the other hand, hydrostatic weighing, skinfold measurements, and bioelectrical impedance are all methods specifically designed to estimate body-fat percentage. Hydrostatic weighing assesses body density by comparing the weight of a person in and out of water, while skinfold measurements use calipers to gauge the thickness of subcutaneous fat at specific body sites. Bioelectrical impedance measures the resistance of body tissues to an electrical current, which varies between fat and lean body mass due to their different compositions. Hence, while the other methods focus on understanding body composition, BMI serves only as a general indicator based on weight and height.