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A jump test on a force plate measures weight-bearing power and allows the dissection of peak power into its components, force and velocity. We investigated the association between jump test power measures and major osteoporotic fractures (MOF) risk in 1841 older men (median age 84\u00a0yr). Peak jump power (W\/kg body weight), force (N\/kg body weight) at peak power, and velocity (m\/s) at peak power were measured by jump tests on a force plate. Fractures were identified by triannual questionnaires, with all self-reported fractures confirmed by medical record. Cox proportional hazards models were used to estimate hazard ratios (HR) and 95% confidence intervals (CIs) by continuous (per one SD increment) and across quartiles of jump test measures. Participants that were excluded from the jump tests were classified into the \u201clowest\u201d group (referent; N\u00a0=\u2009599). A total of 136 incident MOF occurred over 5\u00a0yr of follow-up. In the multiply adjusted models, one SD increment of peak power\/kg body weight was associated with a lower risk of MOF (HR 0.71, 95% CI: 0.54-0.92), with a similar risk reduction observed with velocity at peak power (HR 0.76, 95% CI: 0.59-0.98). Further adjustment for femoral neck (FN) bone mineral density (BMD) did not attenuate the association. There was significant trend of decreasing MOF with increasing power and velocity. For force, only the highest quartile was significantly associated with lower risk of MOF, but this was not significant after adjusting for FN BMD. In older men, peak leg power and velocity, but not force, predicted MOF risk independent of FN BMD. Power, which incorporates velocity, may play a more important role than force in reducing the risk of a fracture.<\/jats:p>","DOI":"10.1093\/jbmr\/zjag014","type":"journal-article","created":{"date-parts":[[2026,1,22]],"date-time":"2026-01-22T12:51:39Z","timestamp":1769086299000},"page":"1060-1068","source":"Crossref","is-referenced-by-count":1,"title":["Leg power and velocity predict the risk of major osteoporotic fractures (MOF): the Osteoporotic Fractures in Men (MrOS) study"],"prefix":"10.1093","volume":"41","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2936-1654","authenticated-orcid":false,"given":"Tong","family":"Yu","sequence":"first","affiliation":[{"name":"Department of Epidemiology, School of Public Health, University of Pittsburgh , Pittsburgh, PA 15261 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4093-6036","authenticated-orcid":false,"given":"Elsa 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University of Southern Denmark , Odense, 5230,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4938-9478","authenticated-orcid":false,"given":"Peggy","family":"Cawthon","sequence":"additional","affiliation":[{"name":"California Pacific Medical Center, Research Institute , San Francisco, CA 94110 ,","place":["United States"]},{"name":"Department of Epidemiology and Biostatistics, University of California San Francisco , San Francisco, CA 94143 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0752-4408","authenticated-orcid":false,"given":"Jane A","family":"Cauley","sequence":"additional","affiliation":[{"name":"Department of Epidemiology, School of Public Health, University of Pittsburgh , Pittsburgh, PA 15261 ,","place":["United 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