Question 11- 12. Choose A, B or C as the best answer.11. For elderly athletes, a decrease in bone density may:

Question

BlackTom AI · Accepted Answer

Lower bone mineral density (osteopenia/osteoporosis) weakens bone structure so fractures and other injuries occur with lower levels of trauma, therefore the correct choice is B: increase the probability of injuries.

1. Relevant knowledge points and concepts
- Bone density (bone mineral density, BMD) measures the amount of mineral in bone and is a major determinant of bone strength.
- Bone remodeling balances resorption and formation; with age, hormonal changes (e.g., lower estrogen/testosterone), reduced mechanical loading, and nutritional deficits often shift this balance toward net bone loss.
- Lower BMD produces more porous, less stiff bone that tolerates less load before failing, increasing risk of fractures (including fragility fractures and stress fractures).

2. Step‑by‑step reasoning
- Aging and reduced anabolic signals → increased bone resorption relative to formation.
- This reduces BMD and bone microarchitectural integrity.
- Reduced structural strength means everyday stresses (falls, bumps, weight-bearing) are more likely to produce fractures or other bone injuries.
- Therefore, elderly athletes with decreased BMD face a higher probability of injury under similar loading conditions than those with normal BMD.

3. Calculations / intermediate steps
- No numerical calculation is needed here; the logical chain is: decreased BMD → decreased bone strength → lower threshold for fracture → increased injury probability.

4. Why the correct answer is correct
- Choice B directly states the principal clinical consequence of decreased bone density: a higher likelihood of injury (especially fractures). This matches clinical evidence and biomechanical reasoning about bone strength.

5. Why the other options are incorrect
- A (reduce muscle mass): Muscle mass loss (sarcopenia) is a distinct process. Although sarcopenia and low BMD can coexist and interact, reduced bone density by itself does not directly cause reduced muscle mass.
- C (speed up recovery): Lower bone density does not speed recovery; if anything, fractures and poor bone quality can prolong healing and complicate recovery.

6. Conclusion
- Decreased bone density in elderly athletes increases fracture and injury risk; thus the correct answer is B: increase the probability of injuries.

Question 11- 12. Choose A, B or C as the best answer.11. For elderly athletes, a decrease in bone density may:单项选择题

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