Exercise and bone mineral density in men: A meta-analysis of randomized controlled trials

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,Zscore alpha values, 95% confidence intervals (CIs), and number needed to treat (NNT). Heterogeneity was examined usingQandI2. Moderator and predictor analyses using mixed-effects ANOVA and simple metaregression were conducted. Statistical significance was set atP≤0.05.Results. Statistically significant improvements were found for both FN (7g's, 466 participants,g=0.342, 95% CI=0.132, 0.553,P=0.001,Q=10.8,P=0.22,I2=25.7%,NNT=5) and LS (6g's, 402 participants,g=0.201, 95% CI=0.009, 0.394,P=0.04,Q=3.3,P=0.65,I2=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.

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Effects of resveratrol supplementation on bone quality: a systematic review and meta-analysis of randomized controlled trials

BMC Complementary Medicine and Therapies ◽

10.1186/s12906-021-03381-4 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Qiangqiang Li ◽

Guangpu Yang ◽

Hongtao Xu ◽

Shaowen Tang ◽

Wayne Yuk-wai Lee

Keyword(s):

Bone Mineral Density ◽

Alkaline Phosphatase ◽

Randomized Controlled Trials ◽

Bone Mineral ◽

Bone Markers ◽

Meta Analysis ◽

Controlled Trials ◽

Bone Biomarkers ◽

Mineral Density ◽

Randomized Controlled

Abstract Background The results from clinical trials have revealed that the effects of resveratrol supplementation on bone mineral density (BMD) and bone biomarkers are inconsistent. Our objective was to determine the effects of resveratrol supplementation on BMD and serum bone biomarkers. Methods PubMed, Cochrane library, EMBASE, Web of science and Scopus were searched up to August 24, 2020. Two reviewers independently performed the articles search and screen according to defined selection criteria. The study quality of the randomized controlled trials (RCTs) was evaluated with the Cochrane scoring system. Heterogeneity among studies was examined by Cochrane Q test. Retrieved data were pooled after mean differences (MD) were computed between two groups for BMD and serum biomarkers. Subgroup analyses were performed to evaluate a potential difference in terms of dose of resveratrol and intervention duration. Sensitivity analysis was executed by omitting studies with imputed values in order to evaluate the influence of these studies on the overall results. Results Ten eligible studies involving 698 subjects were included in this meta-analysis with 401 participants receiving resveratrol and 297 receiving placebo. Supplementation of resveratrol had no statistically significant effects on areal bone mineral density (aBMD) at lumbar spine (MD: -0.02, 95% CI: − 0.05, 0.01, p = 0.26, I2 = 6%), total hip BMD (MD: -0.01, 95% CI: − 0.04, 0.02, p = 0.65, I2 = 0%), and whole body BMD (MD: 0.00, 95% CI: − 0.02, 0.02, p = 0.74, I2 = 0%). Supplementation of resveratrol also did not result in significant change in bone serum markers, including serum alkaline phosphatase (ALP), bone alkaline phosphatase (BAP), osteocalcin (OCN), procollagen I N-terminal propeptide (PINP), C-terminal telopeptide of type I collagen (CTX) and parathyroid hormone (PTH). Subgroup analysis showed the effect of resveratrol supplementation on BMD and serum bone markers were similar in trails of different doses, intervention duration, and pathological conditions of the participants. Conclusion Resveratrol supplementation did not show any significant effect on BMD or serum bone markers with the current evidence. Further investigation with more well-organized multicentre randomized trial is warranted.

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