A 2023 meta-analysis of 18 trials in 666 adults reported a 1.5 percent rise in femoral neck bone density after jump training (Florence and colleagues, 2023, Journal of Sports Sciences). The protocol that produced it was small enough to do in the kitchen: around 50 jumps, four times a week.
The hip matters because falls land there. In the UK, over 100,000 hip fractures happen each year, and one in two women over 50 will sustain an osteoporotic fracture in her lifetime (Royal Osteoporosis Society epidemiology overview). Drugs and nutrition support bone. Loading the bone with brief, repeated impacts adds a third lever, and the dose is smaller than people often expect.
Bone density slips earlier than most people expect
Peak bone mass arrives in the late 20s. After the mid-30s, turnover starts to favour resorption over formation. For women, the steepest losses come in the first 5 to 7 years after menopause, when oestrogen decline accelerates resorption (Royal Osteoporosis Society clinical guidance).
Lower density is not the same as a fracture, but it raises fracture risk. Osteoporosis is often silent: many people learn they have it when a wrist, spine or hip gives way under a load it once handled. Hip fractures sit at the severe end of the spectrum. The Royal Osteoporosis Society epidemiology overview reports hip fracture is fatal in approximately 20 percent of cases and leaves close to half of survivors with lasting disability.
Walking supports balance and general health, but the loads are too low to drive bone formation. Resistance training adds load through muscle pull. Jumping adds load through ground reaction force, and trials reviewed by Florence and colleagues used vertical jump impacts above two times body weight as the loading stimulus.
How jumping changes bone
Bone reacts to mechanical stress through a process called mechanotransduction. Cells called osteocytes detect strain when force passes through the skeleton. If the strain is high and short in duration, osteocytes signal osteoblasts to lay down new bone matrix at the loaded site.
The signal has to be sharp. Long, steady loads such as standing or slow walking do little. Short, high-rate loads such as landing from a jump produce a strain rate which osteocytes register as a fresh stimulus. The Strong, Steady and Straight UK consensus statement on physical activity for osteoporosis (Brooke-Wavell and colleagues, 2022, British Journal of Sports Medicine) builds on this principle, recommending impact and resistance work to maximise bone strength.
The Florence meta-analysis split adults into younger and older subgroups and showed the response is site-specific. The femoral neck, sitting directly under the load path of a vertical landing, gained BMD in both subgroups. The total hip and trochanter gained in younger adults only. The lumbar spine, further from the impact line, did not reach statistical significance in either subgroup. The pattern fits the mechanical theory: load drives bone formation where the line of force runs.
The dose: around 50 jumps, four times a week
The Florence team pooled jumping-trial data and reported no clear dose-response gradient: higher weekly jump counts did not produce proportionally larger BMD gains. The median across trials sat at around 50 jumps per session, four sessions a week, which delivered the 1.5 percent femoral neck BMD rise across the pooled adult sample. Bone responds to a regular impact signal, not to maximum volume.
Earlier randomised trial work shows the same principle at lower volumes. Bassey and colleagues reported that premenopausal women who did 10 to 20 high-impact jumps with 30 seconds of rest between each jump, performed twice a day for 4 to 6 months, increased femoral neck BMD compared with controls (Journal of Bone and Mineral Research, 1998). In a comparable protocol with postmenopausal women, the BMD effect was smaller, which the authors linked to oestrogen-related changes in bone responsiveness.
A six-jump weekly protocol
This is a practical starting plan based on the median dose in the Florence meta-analysis and the UK consensus recommendations. Start with low-impact landings. Build to higher impacts once balance and lower-limb strength feel solid. Read the safety note below first if you have low BMD on a DEXA scan or a history of fractures.
Who should not jump straight in
The Strong, Steady and Straight statement advises people with a known vertebral fracture, severe osteoporosis, or multiple low-trauma fractures to limit impact loading to brisk walking until an exercise professional reviews the case. The same applies to anyone with hip or knee replacements, a recent lower-limb surgery, or balance issues which raise fall risk.
For healthy adults outside those groups, three common mistakes to avoid are: landing stiff-kneed (knees should bend on contact), wearing thin shoes on hard floors at the start (a flat trainer on a wooden floor at home is fine after the first month), and stacking jump days back to back when shins are still tender. Bone responds to rest as well as load.
Frequently asked questions
Bottom line
Bone responds to short, sharp impacts. Across 18 controlled trials in 666 adults, around 50 jumps four times a week produced an average 1.5 percent rise in femoral neck bone density (Florence and colleagues, 2023). Modest gains compound across years when stacked with resistance training and adequate protein intake. Start with heel drops, build to vertical jumps, and treat the protocol as a weekly habit rather than a short cycle.
Sources
- Florence GE, Oosthuyse T, Bosch AN. Skeletal site-specific effects of jump training on bone mineral density in adults: a systematic review and meta-analysis. J Sports Sci. 2023 Dec;41(23):2063-2076. pubmed.ncbi.nlm.nih.gov/38305252
- Brooke-Wavell K, Skelton DA, Barker KL, et al. Strong, steady and straight: UK consensus statement on physical activity and exercise for osteoporosis. British Journal of Sports Medicine, 2022. pubmed.ncbi.nlm.nih.gov/35577538
- Authors et al. Exercise Prescription and the Minimum Dose for Bone Remodeling Needed to Prevent Osteoporosis in Postmenopausal Women: A Systematic Review. Cureus. 2022. pubmed.ncbi.nlm.nih.gov/35859964
- Authors et al. Trends in incidence of recorded diagnosis of osteoporosis, osteopenia, and fragility fractures in people aged 50 years and above: retrospective cohort study using UK primary care data. Osteoporos Int. 2023. pubmed.ncbi.nlm.nih.gov/37162537
- NHS. Osteoporosis: causes and risk factors. www.nhs.uk/conditions/osteoporosis/causes
- NHS. Bone density and osteoporosis. www.nhs.uk/conditions/osteoporosis