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

Decreased bone mineral density (BMD) weakens the structural strength and stiffness of bone, so it directly increases fracture risk and the likelihood of other bone-related injuries.

Relevant knowledge points and concepts:
- Bone density (BMD) reflects mineral content and microarchitecture; lower BMD (osteopenia/osteoporosis) means bones tolerate less load and are more brittle.
- Age-related changes include increased osteoclast (resorption) activity relative to osteoblast (formation) activity, plus poorer bone microarchitecture.
- Healing capacity often declines with age due to reduced cellular activity, comorbidities, and diminished blood supply.

Step-by-step reasoning:
1. A decrease in BMD reduces cross-sectional strength and load-bearing capacity of bone.
2. Under the same mechanical loads (falls, collisions, repetitive stress), weaker bone is more likely to crack, fracture, or sustain stress injuries.
3. Elderly athletes still generate forces during sport; with reduced BMD these forces more readily exceed bone tolerance, so injury probability rises.
4. Additionally, decreased BMD is associated with fragility fractures from low-energy events (e.g., simple falls) and can predispose to stress fractures under repetitive loading.
5. Recovery from bone injury is often slower in older individuals with low BMD, because bone remodeling and repair are less efficient.

Why the correct answer is correct:
- Option B states increased probability of injuries; this follows directly from the mechanical and biological consequences of reduced bone density—bones are weaker and more injury-prone.

Why the other options are incorrect:
- Option A (reduce muscle mass): muscle mass decline (sarcopenia) is a separate, though often coexisting, age-related process. Decreased bone density does not directly cause muscle loss.
- Option C (speed up recovery): lower BMD generally impairs bone strength and healing, so it would not speed recovery; if anything, it slows or complicates recovery.

Conclusion: The best answer is B — decrease in bone density increases the probability of injuries, which matches the provided correct answer.

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

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