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High-intensity resistance training and postmenopausal bone loss: a meta-analysis
1Clinical Trials Research Unit, University of Leeds, Leeds, UK. hcsmmsj@leeds.ac.uk
Summary
High-intensity resistance training significantly increased bone mineral density (BMD) at the lumbar spine in postmenopausal women. However, results varied for the femoral neck and hip, with calcium intake showing positive effects.
Area of Science:
- Exercise physiology
- Gerontology
- Bone health
Background:
- Conflicting evidence exists regarding optimal exercise interventions for postmenopausal bone loss.
- Postmenopausal women are at increased risk for osteoporosis and fractures.
- Bone mineral density (BMD) is a key indicator of bone health.
Purpose of the Study:
- To systematically review and meta-analyze randomized controlled trials (RCTs) evaluating the effects of progressive, high-intensity resistance training on BMD in postmenopausal women.
- To assess the impact of resistance training on BMD at the lumbar spine, femoral neck, and total hip.
- To explore potential moderating effects of calcium supplementation and hormone therapy.
Main Methods:
- Systematic electronic and hand-searching of relevant literature up to December 2004.
- Assessment of study quality and publication bias using established methodologies.
- Meta-analysis using weighted mean difference (WMD) and random or fixed-effect models based on heterogeneity (I² statistic).
Main Results:
- Significant BMD increase (0.006 g/cm²) at the lumbar spine (LS) in 14 homogenous RCT study groups (P=0.006).
- Heterogeneity observed for femoral neck (FN) BMD changes (0.010 g/cm², P=0.11) across 11 RCT study groups.
- Significant positive BMD changes at the total hip (TH) in study groups with increased calcium intake (P=0.007).
- Variability in BMD responses noted with hormone therapy use; low study quality and reporting bias towards positive outcomes were evident.
Conclusions:
- High-intensity resistance training demonstrates efficacy in improving lumbar spine BMD in postmenopausal women.
- Calcium supplementation may enhance the positive effects of exercise on total hip BMD.
- Further high-quality research is needed to clarify optimal exercise protocols and address methodological limitations.
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