How does resistance training influence bone mineral density and fracture risk?

• A. Mechanical loading stimulates bone formation, increasing bone mineral density and reducing fracture risk, especially in at-risk populations.
• B. It reduces bone density.
• C. No effect on bones.
• D. Increases fracture risk.

Answer: (A)

The key idea is that applying mechanical load through resistance training creates strain on bones, which triggers bone remodeling toward stronger bone. When muscles pull on bone during lifts, osteocytes sense the strain and signal more bone formation via osteoblast activity, increasing bone mineral density over time. This makes the bone structurally tougher, especially in the sites you load like the spine and hips. With higher BMD and stronger bone, the risk of fractures decreases, and this effect is especially important for those at higher risk of bone loss, such as older adults or people with osteoporosis.

Resistance training also improves muscle strength and balance, which helps prevent falls. Fewer falls mean fewer opportunities for fracture, so the overall fracture risk drops beyond just the improvements in bone density. It’s not true that this type of training lowers bone density, has no effect, or raises fracture risk—the adaptive response to mechanical loading is bone strengthening and a reduction in fracture risk when properly progressed and performed with safety in mind.

For best results, use progressive overload with regular, weight-bearing sessions a few times per week, include compound movements that load the spine and hips, and pair training with adequate nutrition and fall-prevention factors.