BMJ · IF 55.1 · September 9, 2026 · LoE I
Effect of exercise on bone health in middle aged and older adults: hierarchical network meta-analysis of randomised trials
Changbo Lu, Liwen Li, Lei Zhang, Qiuming Gao, Jia Meng, Yun Xue, Hui Jiang, Tao Yuan, Hong Qian, Nirong Bao, Zhiwen Luo, Xiaojiang Yang — 175th Hospital of People's Liberation Army
This network meta-analysis pooled 124 randomized trials (18,429 adults ≥40 years) comparing different exercise types against no-exercise controls for bone mineral density (BMD) and fracture risk. Brisk walking/jogging and combined aerobic-resistance training produced the largest, though modest, BMD gains (e.g., lumbar spine mean difference 0.013 g/cm², 95% CrI 0.006 to 0.021), while mixed aerobic exercise (odds ratio 0.29) and mind-body exercise (odds ratio 0.58) were associated with lower fracture risk; effects generally plateaued above roughly 600-900 METs-min/week of activity.
AI summary · from the full text · reviewed by Pukhraj Gaheer, Medical Student, Queen's University before publishing
Why it mattersGives clinicians a starting point for prescribing specific exercise types and doses to preserve bone density and reduce fracture risk in aging patients, an issue relevant to orthopedic, primary care, and rehabilitation counseling.
Conclusion strengthConfirms prior evidence
How many patients this affects and prospectively registered, offset by low reported GRADE certainty.
Presenting this at rounds? Start here
- ?For a patient with osteopenia who dislikes high-impact activity, would substituting mind-body exercise (like tai chi) provide comparable fracture-risk reduction to more traditional aerobic programs?
- ?Given that BMD benefits plateaued around 600-900 METs-min/week, how should clinicians balance recommending 'more is better' exercise advice against fall risk in older, frailer patients?