Heavy Lifting and Bone Density: What the LIFTMOR Trial Found

The one bone-loading program we found with randomized-trial results in this group is short and heavy: two supervised 30-minute sessions a week, built around lifts near your limit. In the LIFTMOR trial, women with low bone mass who did this for eight months gained spine bone density while a gentler home program group lost some.^[1] The trial was done in postmenopausal women under close supervision, so treat it as a plan to bring to your clinician, not something to copy alone in your garage.

What the trial did

LIFTMOR was a randomized controlled trial of 101 postmenopausal women (average age 65) with low bone mass, meaning a T-score below -1.0. The researchers screened out conditions and medications that affect bone and physical function. Forty-nine women did high-intensity resistance and impact training (HiRIT): twice a week for 30 minutes, supervised, doing 5 sets of 5 repetitions at more than 85% of their one-repetition maximum. The other 52 followed a low-intensity, home-based exercise program.^[1]

What it found

• Lumbar spine bone mineral density improved significantly more in the HiRIT group than in the comparison group (p < 0.001).
• Femoral neck bone density also improved significantly more in the HiRIT group (p = 0.004).
• Every functional test favored HiRIT: timed up-and-go, functional reach, five times sit-to-stand, and back and leg strength (all p < 0.001).
• Attendance was high in the HiRIT group, and the only adverse event reported was a minor lower back spasm.

A follow-up analysis of the same participants looked for vertebral fractures on spine scans. The HiRIT group showed no change in fracture classification and a larger reduction in thoracic kyphosis (forward rounding of the upper back) than the comparison group. One new wedge deformity of a vertebra appeared in the comparison group.^[2]

What the trial cannot say

• The authors describe the result as holding “under highly supervised conditions” in otherwise healthy postmenopausal women. It does not show that unsupervised heavy lifting is safe for people with osteoporosis.^[1]
• It measured bone density and function, not fractures. Scan changes are a stand-in for fracture risk, not proof that fractures dropped.
• It ran eight months in women around age 65. The abstract does not cover men, women before menopause, or people in their 40s and 50s.
• HiRIT combined heavy lifting with impact work, and the results do not separate the two. The comparison group did low-intensity exercise, not nothing.

What to do with it

1. Ask your clinician whether a bone-density scan (DXA) makes sense for you. Mention it especially after menopause, after a fracture, or if you take medications that affect bone.
2. If you have osteoporosis or low bone mass, ask for a referral to a physical therapist or trainer who works with bone health and can supervise heavy lifting. The trial’s loads were set by supervisors after screening.
3. If your clinician clears you, aim for the trial’s dose: two sessions a week of about 30 minutes, working toward 5 sets of 5 repetitions with a heavy load. Build up gradually (our wording) and leave jumping or other impact work for your supervisor to introduce.
4. Track function between scans. Time five sit-to-stands from a standard chair once a month and write the number down. The trial used the same test.

If you take one thing, take step one: find out where your bone density stands before you choose a plan. Everything else, including how heavy and how often, should come from someone who has seen your scan and watched you move.

References

[1] Watson SL, Weeks BK, Weis LJ, et al. High-intensity resistance and impact training improves bone mineral density and physical function in postmenopausal women with osteopenia and osteoporosis: the LIFTMOR randomized controlled trial. J Bone Miner Res. 2018;33(2):211-220. DOI: 10.1002/jbmr.3284. Finding as used: 101 postmenopausal women with low bone mass (T-score below -1.0; mean age 65 plus or minus 5 years) were randomized to 8 months of twice-weekly, 30-minute supervised HiRIT (5 sets of 5 repetitions at over 85% 1RM; n=49) or a home-based low-intensity program (n=52). HiRIT was superior for lumbar spine BMD (p<0.001), femoral neck BMD (p=0.004) and all functional performance measures (p<0.001). HiRIT compliance was high, with one adverse event (minor lower back spasm). The authors report no adverse events “under highly supervised conditions” in otherwise healthy postmenopausal women. ↑︎

[2] Watson SL, Weeks BK, Weis LJ, et al. High-intensity exercise did not cause vertebral fractures and improves thoracic kyphosis in postmenopausal women with low to very low bone mass: the LIFTMOR trial. Osteoporos Int. 2019;30(5):957-964. DOI: 10.1007/s00198-018-04829-z. Finding as used: In LIFTMOR participants, the HiRIT group showed no change in vertebral fracture classification and a larger reduction in standing-tall thoracic kyphosis than controls (-6.7 vs -1.6 degrees, p=0.031); a single new wedge deformity was observed in the control group. Supervised HiRIT was not associated with increased vertebral fracture risk. ↑︎

Kurt Greiner

Kurt is a digital strategist and IT professional blending emerging technology with practical application, exploring how individuals can leverage modern tools to navigate the second half of life with purpose.