Effects of Moderate- to High-Impact Exercise on Bone Structure: A Systematic Review and Meta-Analysis

This systematic review and meta-analysis examined randomized controlled trials studying the effects of moderate- to high-impact exercise on bone structure across the lifespan. The researchers specifically focused on high-impact activities — those generating significant ground reaction forces — and measured outcomes including volumetric bone mineral density (vBMD), cortical bone thickness, trabecular bone properties, and bone strength indices. Only RCTs were included, making this one of the highest-quality evidence reviews in the bone health and exercise field.

The meta-analysis found that high-impact exercise training produced significant improvements in volumetric bone mineral density and bone structural properties compared to control conditions. The benefits were consistent across age groups, with the older adult subgroup showing meaningful gains in total hip and lumbar spine density. High-impact training outperformed moderate-impact protocols for bone structural outcomes, suggesting a dose-response relationship between impact intensity and skeletal adaptation. Importantly, benefits were observed even in individuals who began training in their 50s and 60s.

This meta-analysis is significant for two reasons. First, it confirms that bone responds to high-impact loading at any age — the skeleton retains plasticity well into later decades. Second, it provides direct evidence that the type of exercise matters: activities generating high ground reaction forces, such as sprinting, produce greater skeletal adaptation than lower-impact alternatives. For men concerned about bone loss, osteoporosis, or fracture risk, this research suggests that sprint training is among the most effective exercise interventions available — and that it's not too late to start.