Which body composition measurement uses height and weight measurements?

Question

BlackTom AI · Accepted Answer

Body mass index (BMI) is calculated directly from a person’s height and weight: BMI = weight (kg) ÷ [height (m)]^2, so...

1. Relevant knowledge points and concepts
- BMI is an anthropometric index that uses only height and weight to estimate whether an individual’s body mass is in underweight, normal, overweight, or obese ranges.
- Other body composition methods measure different physical properties: air displacement measures body volume, skinfolds measure subcutaneous fat thickness, and bioelectrical impedance measures electrical resistance of body tissues.

2. Step-by-step reasoning
- The question asks which measurement uses height and weight. Identify which method’s primary inputs are height and weight.
- BMI’s formula directly requires those two values; the other methods do not rely primarily on the simple height–weight formula.

3. Example calculation (all intermediate steps)
- Suppose weight = 70 kg and height = 1.75 m.
- Square the height: 1.75^2 = 3.0625.
- Divide weight by squared height: 70 ÷ 3.0625 = 22.857...
- Resulting BMI ≈ 22.9 kg/m^2.

4. Why the correct answer is correct
- BMI is defined by and computed from height and weight only, making it the method that explicitly “uses height and weight measurements.” It is a straightforward index, not a direct body fat measurement but a height–weight ratio.

5. Why the other options are incorrect
- a. Air displacement (e.g., Bod Pod) measures body volume by air displacement and uses mass and volume to calculate density and percent body fat; it is not a simple height–weight index.
- c. Skinfold thickness uses calipers to measure subcutaneous fat at multiple sites; it relies on thickness measurements and predictive equations, not just height and weight.
- d. Bioelectrical impedance measures electrical resistance to estimate body water/fat-free mass; while many prediction equations may include height or weight as covariates, the primary measurement is impedance, not the height–weight formula.

6. Conclusion
- Therefore the correct answer is Body mass index, which matches the provided answer.

Which body composition measurement uses height and weight measurements?单项选择题

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