Highâimpact physical activities with bone strains of high magnitude and frequency may benefit bone health. This study aimed to investigate the longitudinal associations between changes in loading intensities and application rates, estimated from selfâreported physical activity, with bone mineral density (BMD) changes over 5âyears and also with incident falls over 2âyears and longâterm incident fractures in communityâdwelling older men. A total of 1599 men (mean age 76.8â±â5.4âyears) from the Concord Health and Aging in Men Project (CHAMP) were assessed at baseline (2005â2007) and at 2â and 5âyear followâup. At each time point, hip and lumbar spine BMD were measured by dualâenergy Xâray absorptiometry, and physical activity energy expenditure over the past week was selfâreported via the Physical Activity Scale for the Elderly (PASE) questionnaire. Sum effective load ratings (ELRs) and peak force were estimated from the PASE questionnaire, reflecting the total and highest loading intensity and application rate of physical activities, respectively. Participants were contacted every 4âmonths over 2âyears to selfâreport falls and over 6.0â±â2.2âyears for fractures. Hip fractures were ascertained by data linkage for 8.9â±â3.6âyears. Compared with sum ELR and PASE scores, peak force demonstrated the greatest standardized effect size for BMD maintenance at the spine (ÎČ = 9.77âmg/cm2), total hip (ÎČ = 14.14âmg/cm2), and femoral neck (ÎČ = 13.72âmg/cm2) after adjustment for covariates, including PASE components (all pâ<â.01). Only PASE scores were significantly associated with reduced falls risk (standardized incident rate ratio = 0.90, 95% confidence interval 0.81â1.00, p = .04). All physical activity measures were significantly associated with reduced incident fractures in univariate analyses, but none remained significant after multivariable adjustments. Older men who engaged in physical activity of high and rapid impact maintained higher BMD, while higher energy expenditure was associated with reduced falls risk. Coupling traditional physical activity data with bone loading estimates may improve understanding of the relationships between physical activity and bone health. © 2020 American Society for Bone and Mineral Research (ASBMR).