Does strength training help against osteoporosis?

Strength training increases bone density in postmenopausal women at three critical sites: the lumbar spine, the femoral neck, and the total hip. A meta-analysis of 17 studies shows this consistently. The effects are modest but measurable: think improvements of one to three percent in bone density.

The strongest evidence comes from a randomised trial involving 101 women with an average age of 65. They trained twice a week for eight months using heavy weights, at loads above 85% of their maximum capacity. Bone density in the lumbar spine increased by almost 3%, while the control group actually lost 1.2%. At the femoral neck, the training group maintained bone density; the control group lost almost 2%.

Notably, heavy training also proved to be safe. In that study only one minor side effect occurred (a mild muscle cramp), and there were no bone fractures. This contradicts the widely held fear that heavy lifting is dangerous for people with osteoporosis. It should be noted, however, that the training was strictly supervised and that participants were otherwise in good health. Unsupervised heavy training at home is a different situation.

Beyond bone density, strength training offers an additional benefit: it builds muscle mass, improves strength, and trains balance. That matters, because bone fractures usually result from a fall. A stronger, more stable body reduces the risk of falling, regardless of what happens to bone density itself.

Clinical guidelines regard strength training as a fixed pillar in the management of osteoporosis, alongside calcium, vitamin D, and medication where appropriate. For people at high fracture risk it is not a replacement for medication, but a valuable addition. Free weights appear to be more effective than machines, at least for the hip. Training two to three times per week with progressively heavier weights is the most thoroughly researched pattern.