Abstract
Summary
We compared the relationship between physical activity (PA) and bone mineral density (BMD) in men and women aged over 50 years. Only moderate-to-vigorous PA was positively associated with hip BMD in men. There was no association between PA and BMD at any site in women.
Introduction
Physical activity (PA) is widely recommended for osteoporosis. However, epidemiological data regarding the intensity or volume of PA required for bone health are lacking. We aimed to investigate and compare the relationship between PA and bone mineral density (BMD) in men and women.
Methods
This population-based cross-sectional study used data from the 4th and 5th Korea National Health and Nutrition Examination Surveys and included 2767 men and 2753 women aged > 50 years. The intensity, frequency, and duration of PA were assessed using a questionnaire, and the participants were divided into the no activity, walking-only, moderate PA, and vigorous PA groups. BMD was measured at the lumbar spine (LS), femur neck (FN), and total hip (TH) using dual-energy X-ray absorptiometry.
Results
Adjusted-BMDs of the hip were higher in men and women in the moderate and vigorous PA groups than those in men and women in the walking-only and no activity groups, while frequency and duration of PA were not associated with BMD at any site. The odds ratios for osteoporosis were the lowest at the FN and TH in men in the vigorous PA group (0.354, 95% confidence interval (CI) 0.139–0.901, P < 0.002, and 0.072, 95% CI 0.007–0.766, P < 0.003, respectively), while it was not significant in women.
Conclusion
Only moderate-to-vigorous PA was positively associated with the hip BMD in men. There was no association between PA and BMD at any site in women. It is necessary to assess the PA intensity for bone health based on the site and sex.
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Korea National Health and Nutrition Examination Survey (KNHANES) adheres to the principles outlined in the Declaration of Helsinki for research involving humans; all participants provided written informed consents and the protocol for KNHANES was approved by the Institutional Review Board of Korea Center for Disease Control and Prevention (No. 2008-04EXP-01-C, 2009-01CON-03-2C, 2010-02CON-21-C, and 2011-02CON-06-C). The current study did not require additional approval because the KNHANES dataset is publicly available (http://knahnes.cdc.go.kr).
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Informed consent was not required for this study because anonymized and de-identified data was used for the analyses.
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Kim, Y.A., Lee, Y., Lee, J.H. et al. Effects of physical activity on bone mineral density in older adults: Korea National Health and Nutrition Examination Survey, 2008–2011. Arch Osteoporos 14, 103 (2019). https://doi.org/10.1007/s11657-019-0655-5
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DOI: https://doi.org/10.1007/s11657-019-0655-5