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Heavy weights vs. light weights: which builds better bones?

NCT ID NCT05541432

Completed Disease control Sponsor: University of Waterloo Source: ClinicalTrials.gov ↗

First seen Jul 23, 2026 · Last updated Jul 24, 2026 · Updated 1 time

Summary

Osteoporosis weakens bones and raises fracture risk, but the best exercise for building bone is unclear. This trial tests two supervised strength-training programs in adults aged 50 and older with low bone density. One group lifts at a moderate intensity (70% of their max), the other at a higher intensity (85% of their max). The goal is to see which approach better improves spine bone density and reduces fractures.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance
supervised strength training at two different intensities
What this could lead to
If it works, this could point toward a simple, drug-free way to strengthen bones and reduce fracture risk in older adults with low bone density.
What could go wrong
This is a relatively early-stage trial with 324 participants, and exercise studies are hard to blind. The higher-intensity group may face a greater risk of injury or drop out.

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Conditions

The condition(s) this trial relates to.

Bone Diseases, Metabolic bone fracture Motor Activity osteoporosis

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

OSTEOPENIA OSTEOPOROSIS

Contacts and locations

Locations

  • University of Saskatchewan

    Saskatoon, Canada

  • University of Toronto

    Markham, Canada

  • University of Waterloo

    Waterloo, Ontario, Canada

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