This article is for general informational purposes only and does not constitute clinical advice. Please consult a registered health practitioner before commencing any exercise program.
Osteoporosis and osteopenia are common age-related conditions characterised by reduced bone mineral density (BMD), increasing the risk of fractures. They are particularly prevalent in postmenopausal women due to the rapid decline in oestrogen, a hormone that plays a vital role in maintaining bone mass. As our population continues to age, exercise (particularly resistance training) has become a cornerstone of both preventing and managing these conditions.
Among all exercise interventions, heavy resistance training is emerging as one of the most effective non-pharmacological strategies for improving bone health.
One of the biggest misconceptions is that lifting heavy weights is dangerous if you have low bone density. While poor technique or inappropriate loading can increase injury risk, the opposite is often true when training is prescribed correctly. Progressive, well-supervised resistance training can be a highly effective way to maintain — and in some cases improve — your bone health.
The reason is simple: bone is living tissue that adapts to mechanical stress. When you place greater loads through your skeleton, your bones respond by becoming stronger and denser. Although this response is reduced in people with osteoporosis and osteopenia, it is certainly not absent. In fact, mechanical loading remains one of the few proven ways to stimulate new bone formation.
Not all exercise creates the same response. Walking and other light activities are excellent for general health, but they typically do not provide enough mechanical strain to significantly improve bone density. Research consistently shows that heavier, progressive resistance training is far more effective.
A position statement published in the Journal of Bone Metabolism found that resistance training performed three times per week was more effective than twice weekly for postmenopausal women. Participants gradually progressed from around 50% to 85% of their one-repetition maximum (1RM) over four to five sets, providing the level of loading required to stimulate bone formation. Heavy resistance training also increases muscle strength, improves balance, and creates greater forces through the skeleton, all of which contribute to healthier bones and a lower risk of falls.
The evidence suggests the greatest benefits occur when training is:
One of the landmark studies in this area was the LIFTMOR Trial. Over an eight-month intervention, postmenopausal women with osteopenia showed improvements in lumbar spine bone density of approximately 3% while maintaining or slightly improving hip bone density. Results varied between participants, and these figures reflect outcomes within this specific research cohort rather than a guarantee of individual results.
The program was straightforward: participants progressively worked towards five sets of five repetitions at 80–85% of their 1RM, performing back squats, deadlifts and overhead presses, alongside jumping chin-up landings to provide safe impact loading. Participants began with lighter loads before gradually progressing to higher intensities under supervision. For those unable to tolerate heavy lifting due to arthritis or other conditions, moderate-intensity resistance training still provided meaningful benefits.
Safety is understandably a common concern. However, research consistently shows that when heavy resistance training is introduced gradually, performed with good technique, and supervised where appropriate, it does not increase fracture risk. Instead, it improves strength, balance, coordination and confidence — factors that are just as important as bone density when it comes to preventing fractures.
Improvements in bone density from resistance training are typically modest and vary between individuals — research studies have reported changes in the range of 1–3% per year, though individual responses depend on factors such as genetics, nutrition, medications and existing health conditions. It is important to understand that simply maintaining bone density is a significant clinical outcome, as untreated osteoporosis is characterised by ongoing bone loss. Slowing or stopping that decline can substantially reduce fracture risk and help maintain independence.
Even when bone density changes are relatively small, heavy resistance training consistently improves strength, physical function and reduces the likelihood of falls and fractures. An individualised exercise program, designed by a registered health practitioner, ensures that training is appropriate for your specific circumstances and health status.
For many older adults — particularly postmenopausal women — heavy resistance training is not something to fear. When assessed and prescribed appropriately by a qualified practitioner, it is one of the most well-supported exercise strategies available for maintaining healthy bones and staying active for longer.
Written by Jake Te Whare, Physiotherapist (AHPRA registered)
This article is for general informational purposes only and does not constitute clinical advice. Individual results vary. Please consult a registered health practitioner (AHPRA-registered) before commencing or modifying any exercise program. References available on request.
