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Objective . Examine the effects of exercise on femoral neck (FN) and lumbar spine (LS) bone mineral density (BMD) in premenopausal women.  Methods . Meta-analysis of randomized controlled exercise trials ≥24 weeks in premenopausal women. Standardized effect sizes ( g ) were calculated for each result and pooled using random-effects models,  Z  score alpha values, 95% confidence intervals (CIs), and number needed to treat (NNT). Heterogeneity was examined using  Q  and  I   2 . Moderator and predictor analyses using mixed-effects ANOVA and simple metaregression were conducted. Statistical significance was set at  P  ≤ 0.05.  Results . Statistically significant improvements were found for both FN (7 g 's, 466 participants,  g  = 0.342, 95%  CI = 0.132, 0.553,  P  = 0.001,  Q  = 10.8,  P  = 0.22,  I   2  = 25.7%, NNT = 5) and LS (6 g 's, 402 participants,  g  = 0.201, 95%  CI = 0.009, 0.394,  P  = 0.04,  Q  = 3.3,  P  = 0.65,  I   2  = 0%, NNT = 9) BMD. A trend for greater benefits in FN BMD was observed for studies published in countries other than the United States and for those who participated in home versus facility-based exercise. Statistically significant, or a trend for statistically significant, associations were observed for 7 different moderators and predictors, 6 for FN BMD and 1 for LS BMD.  Conclusions . Exercise benefits FN and LS BMD in premenopausal women. The observed moderators and predictors deserve further investigation in well-designed randomized controlled trials.

Exercise and Bone Mineral Density in Premenopausal Women: A Meta-Analysis of Randomized Controlled Trials