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Two factors generally reported to influence bone density are body composition and muscle strength. However, it is unclear if these relationships are consistent across race and sex, especially in older persons. Therefore, we examined the independent effects of bone mineral-free lean mass LM , fat mass FM , and muscle strength on regional and whole body bone mineral density BMD in a cohort of 2, well-functioning older adults participating in the Health, Aging, and Body Composition Health ABC Study with complete measures. Participants included white women, black women, white men, and black men aged years. Handgrip strength and knee extensor torque were determined by dynamometry. The following were the respective beta-weights regression coefficients for standardized data, Std beta and percent difference in BMD per unit 7. These results indicate that LM and FM were associated with bone mineral depending on the bone site and bone index used. Where differences did occur, they were primarily by sex not race.
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