Told to Protect Your Bones? One Trial Tested the Opposite.

September 4, 2026

Written and reviewed by Rev. Dr. LaVeena B. Archers, PhD
Doctor of Natural Medicine · Board-certified in Holistic Functional Medicine and Functional Nutrition
Educational content only. Not medical advice, and never a substitute for your own care. Scope of practice.

A woman told her bone density is low is usually told something else in the same breath: be careful. Avoid impact. Do not lift anything heavy. The advice sounds like caution, and the risk it guards against is one the research literature calls perceived rather than demonstrated ^[1]. A research team in Queensland tested it directly. They took 101 postmenopausal women, average age 65, all with a T-score below -1.0, and randomized half of them to twice-weekly training at more than 85% of their one-repetition maximum ^[1]. The lifting group gained 2.9% in spine bone density while the comparison group lost 1.2% ^[1]. There was one adverse event in the whole trial, a minor back spasm ^[1].

What the trial actually did

The LIFTMOR trial randomized women with osteopenia and osteoporosis into two groups ^[1].

One group did 30 minutes of supervised high-intensity resistance and impact training, twice a week: five sets of five repetitions, above 85% of their one-rep max ^[1]. That is heavier work than a bone-density program is usually allowed to involve. The other group did a home-based, low-intensity exercise program ^[1].

After eight months, the differences at the spine and hip were these ^[1]:

• Lumbar spine bone density: up 2.9% in the lifting group, down 1.2% in the comparison group.
• Femoral neck bone density: up 0.3% lifting, down 1.9% comparison.
• Femoral neck cortical thickness: up 13.6% lifting, up 6.3% comparison.
• Height: up 0.2 cm lifting, down 0.2 cm comparison.
• Every measure of physical function tested, including back and leg strength and sit-to-stand: better in the lifting group.

Read the hip numbers carefully, because they carry the most useful lesson in the trial. The lifting group's femoral neck barely moved. What separated the groups there was mostly that one group held its ground while the other lost bone on schedule. That is still worth having. It is not the same claim as "lifting rebuilds your hip."

The safety question, which is the real question

The reason this trial matters is not the density numbers. It is that the intervention was the thing women with thinning bones are specifically warned away from. The trial's own authors note that this kind of loading is not traditionally recommended for people with osteoporosis, because of a perceived high risk of fracture ^[1].

So the team went back and looked specifically for that fracture. A follow-up analysis examined vertebral body shape, Cobb angle, and clinical measures of thoracic kyphosis in the same participants ^[2]. No participant in the lifting group had a change in vertebral fracture classification. One new wedge deformity turned up over the eight months, and it was in the comparison group, the one doing gentle exercise at home ^[2].

One event in one group of about fifty women proves nothing by itself, and I am not going to pretend otherwise. What it does do is remove the expected result. If heavy loading were crushing fragile spines, this is the trial where that should have shown up, and it did not. The lifting group's standing-tall thoracic kyphosis also improved more than the comparison group's, by about 6.7 degrees against 1.6 ^[2] — a straighter upper back, in the group that was supposed to be at risk of collapsing one.

The word doing the heaviest lifting here is "supervised"

Every session in that trial was supervised ^[1], and the authors say plainly that their safety finding holds under highly supervised conditions ^[1]. This is not a hedge to skim past. A near-maximal lift learned from a video, performed alone, in a body with low bone mass, is not the intervention that was tested. What was tested was heavy loading taught and watched by people who knew what they were looking at.

Compliance was 92% in the lifting group ^[1], which is worth noticing on its own. Women in their sixties with diagnosed bone loss turned up for supervised heavy training nine times out of ten.

Does this apply to you at 47?

Probably not directly, and this is where I would rather under-claim. The participants averaged 65 years old and were already past menopause with measured low bone mass ^[1]. If you are in perimenopause with bone density nobody has measured, this trial is not about you. What is about you is timing: bone loss and sleep disruption accelerate during the transition itself rather than politely waiting until after it, which is what changes first in perimenopause.

The wider evidence is also more cautious than one trial. A 2024 systematic review of resistance training in healthy postmenopausal women pooled 12 randomized trials and found solid improvements in strength and in maximal oxygen uptake, while describing the effect on bone mineral density itself as more debated ^[3]. Strength and fitness respond reliably. Bone is slower and less certain.

What is actually worth doing with this

The dose is smaller than the intensity makes it sound. LIFTMOR ran on two 30-minute sessions a week ^[1]. Across cohort studies of muscle-strengthening activity of any kind, the largest reduction in mortality risk shows up at roughly 30 to 60 minutes a week ^[4], and US federal guidance asks only for muscle-strengthening work on two or more days a week ^[5]. Nobody in this literature is asking you to live in a gym.

Three honest limits before you act on any of it. LIFTMOR was one trial of about a hundred women, and both papers here come from the same team studying the same participants, so this is one finding examined twice rather than two independent confirmations ^{[1, 2]}. It was supervised throughout ^[1]. And bone density is a proxy: this trial measured density and posture, not whether fewer women went on to break a hip.

What survives all three caveats is still worth your attention. The caution around fragile bones rests on a risk the trial's own authors call perceived ^[1], and when it was tested head-on against heavy loading, careful lost. If your bone density is low, the useful question to bring to your own clinician is not whether to lift, but who is going to teach you.

I write about building and keeping that strength through midlife in The Muscle You Keep, and about protein, which your bones and muscles both need more of than the official number suggests, in the protein number you were given.

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