A change in which of the following would boost one's resting metabolic rate?

Question

BlackTom AI · Accepted Answer

Lean (fat‑free) body mass largely determines resting metabolic rate (RMR). Fat‑free tissues—especially skeletal muscle, liver, heart and kidneys—are metabolically active and consume more energy at rest than adipose tissue. RMR is therefore higher in people with greater lean mass.

1) Relevant knowledge points and concepts
- RMR (or basal metabolic rate) is the energy used at rest to sustain vital functions. It is most strongly correlated with lean body mass.
- Different tissues have different metabolic rates: metabolically active organs and muscle have higher energy demands per unit mass than adipose tissue.
- Other factors (age, sex, hormones, fever, activity, genetics) can affect RMR, but body composition is the primary modifiable determinant.

2) Step‑by‑step reasoning
- Compare energy use per unit mass of muscle versus fat. A common practical estimate: ~6 kcal/day per pound of muscle vs ~2 kcal/day per pound of fat.
- Convert to metric for clarity: 1 lb ≈ 0.4536 kg, so roughly 13 kcal/day per kg of muscle (6 kcal ÷ 0.4536) and about 4.4 kcal/day per kg of fat (2 kcal ÷ 0.4536).
- If a person gained 5 kg of lean mass, the expected RMR increase ≈ 5 kg × 13 kcal/kg/day = 65 kcal/day.

3) Calculations (intermediate steps shown)
- 6 kcal per lb (muscle) → per kg: 6 ÷ 0.4536 = 13.24 kcal/kg/day.
- 2 kcal per lb (fat) → per kg: 2 ÷ 0.4536 = 4.41 kcal/kg/day.
- RMR change for +5 kg muscle: 5 × 13.24 = 66.2 kcal/day (approx. 65–66 kcal/day).

4) Why the correct answer is correct
Increasing the proportion of lean tissue (improved body composition) raises the mass of high‑metabolic‑rate tissue and therefore increases the RMR. This is a direct, sustained effect, unlike transient influences.

5) Why the other options are incorrect
- Pulse rate: Resting heart rate is an indicator of cardiovascular fitness but does not itself raise the RMR long term. Fitter people often have lower resting pulse despite higher muscle mass.
- HDL level: HDL is a blood lipid parameter (cholesterol transport); it does not drive resting energy expenditure.
- Inflammation: Acute inflammation (fever, severe infection) can temporarily raise metabolic rate, but chronic low‑grade inflammation is not a practical or healthy way to “boost” RMR and typically has modest effects compared with body composition.

6) Conclusion
Because lean (fat‑free) mass is the main determinant of resting energy expenditure, changing body composition (increasing lean mass) will boost RMR. This confirms the provided correct answer: body composition.

A change in which of the following would boost one's resting metabolic rate?单项选择题

类似问题

Which is the largest component of metabolism, accounting for about 65% to 70% of daily energy expenditure?

What did Dr. Hall's study find about the contestants' resting metabolic rates after six years?

Question at position 43 Over the lifespan, when accounting for lean body mass, resting metabolism tends to:Remain the sameDecreaseIncreaseNot enough information

Question at position 10 Lean body mass is a modifiable variable that influences resting metabolism?TrueFalse

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

Question at position 2 Claudio has more lean body mass than Vanessa, so you could predict that Claudio has a resting metabolism that is ____ than Vanessa: the samelowerhighernot enough information

The main contributor to daily energy expenditure for the average person is the:

The greatest contributor to the average persons daily energy expenditure is:

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单