Question at position 9 The use of a triaxial accelerometer is acceptable for assessing the resting metabolic rate of all people, regardless of their body composition.TrueFalse单项选择题
A
True
B
False

Question

Question at position 9 The use of a triaxial accelerometer is acceptable for assessing the resting metabolic rate of all people, regardless of their body composition.TrueFalse

BlackTom AI · Accepted Answer

Accelerometers measure body acceleration, not the biochemical processes that determine resting metabolic rate (RMR). A triaxial accelerometer records movement in three axes and improves activity detection and activity energy–expenditure estimates, but it cannot directly measure oxygen consumption or substrate oxidation that define RMR.

1) Relevant knowledge points and concepts
- RMR (or BMR) is the energy required for physiological functions at rest and is best measured by indirect calorimetry (VO2/CO2) or estimated from equations that include fat‑free mass (FFM).
- Accelerometers estimate energy expenditure primarily from movement counts and use population-based algorithms; they perform poorly when estimating energy expenditure that is independent of movement (i.e., true resting metabolism).
- Body composition (FFM vs fat mass) has a large effect on RMR: more FFM → higher RMR.

2) Step-by-step reasoning
- When a person is resting, accelerometer counts are minimal. The device therefore must rely on imputed or generalized algorithms (often using age, sex, weight) to estimate RMR.
- Those algorithms often ignore or poorly account for individual differences in FFM; two people with the same weight but very different FFM will have substantially different RMRs that the accelerometer-based estimate can miss.

3) Example calculation (intermediate steps)
- Use Katch‑McArdle: RMR ≈ 370 + 21.6 × FFM.
- Person A (lean): FFM = 60 kg → RMR ≈ 370 + 21.6×60 = 370 + 1296 = 1666 kcal/day.
- Person B (higher fat mass): FFM = 45 kg → RMR ≈ 370 + 21.6×45 = 370 + 972 = 1342 kcal/day.
- An accelerometer algorithm that uses weight alone (or movement + generic coefficients) could estimate similar RMRs for both, thereby misestimating by hundreds of kcal.

4) Why the correct answer is correct
- Because accelerometers do not measure metabolic rate directly and cannot reliably account for individual body‑composition differences, they are not acceptable as a universal tool to assess RMR for all people.

5) Why the other option is incorrect
- "True" is incorrect: claiming acceptability for all people ignores the dependence of RMR on FFM and the accelerometer’s movement-based limitations and known bias in obese vs lean individuals.

6) Conclusion
- Therefore the statement is False, which matches the provided answer.

Question at position 9 The use of a triaxial accelerometer is acceptable for assessing the resting metabolic rate of all people, regardless of their body composition.TrueFalse单项选择题

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