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Physical activity and dietary calcium interactions in bone mass in Scottish postmenopausal women

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Abstract

Summary

In this population-based cohort of 1,254 older Scottish women we found significant interactions between the mechanical component of self-reported habitual physical activity (PA) and dietary calcium (Ca) in BMD, independent of other risk factors. At low and/or medium Ca intakes BMD was higher amongst the most active people.

Introduction

Although there is general agreement that increased activity (PA) and dietary calcium (Ca) consumption may help maintain bone mass in later life and prevent fractures, the amount required remains uncertain.

Methods

In 2001–2003, 1,847 postmenopausal women (mean ± SD age: 69.3 ± 5.5 years) underwent bone mineral density (BMD) measurement and, in 2004, 68.7% (n = 1,254) completed a bone-specific Physical Activity Questionnaire (bsPAQ) and a food frequency questionnaire. The bsPAQ measures the metabolic and mechanical components of PA. Interactions of PA and Ca in BMD were examined using ANCOVA.

Results

Significant interactions were identified in the BMD of the lumbar spine (LS), right hip (RH) and left hip (LH), after adjustment for confounders, between tertiles of PA classified according to the mechanical component and tertiles of energy-adjusted Ca intake (ANCOVA p = 0.006, p = 0.004 and p = 0.013 respectively). For example, at medium Ca intakes LH BMD was higher by 7.8% in the highest tertile of PA compared with the lowest tertile of PA.

Conclusions

These data suggest that health promotion campaigns to increase PA would be most effective in populations with a low/medium calcium intake.

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Acknowledgements

We are grateful to everyone that helped with the NOSOS study (radiographers, research nurses, administration staff, clinicians) at both the Aberdeen and Dingwall centres, as well as Dr Malcolm Steven, who assisted with original participant access at the Dingwall centre. We would like to express our thanks to Anta Hardcastle and Lara Dawson for their help in inputting the dietary data. We also thank David and Mike Grubb for providing us with the dietary analysis programme and Mr Allan Walker for his help with extracting the BMD database. Finally, we are extremely grateful to the 1,254 women who responded positively to our invitation to take part in this study. This work was partially funded by the Development Fund, University of Aberdeen, Aberdeen UK and the Grampian University Hospital NHS Trust (GUHT) Endowment Research Grant.

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Mavroeidi, A., Stewart, A.D., Reid, D.M. et al. Physical activity and dietary calcium interactions in bone mass in Scottish postmenopausal women. Osteoporos Int 20, 409–416 (2009). https://doi.org/10.1007/s00198-008-0681-4

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  • DOI: https://doi.org/10.1007/s00198-008-0681-4

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