Abstract
Our objective was to assess the contribution of lean body mass (LBM) and fat body mass (FBM) to areal bone mineral density (aBMD) in women during the years surrounding menopause. We used a 12-year observational design. Participants included 75 Caucasian women who were premenopausal, 53 of whom were available for follow-up. There were two measurement periods: baseline and 12-year follow-up. At both measurement periods, bone mineral content and aBMD of the proximal femur, posterior-anterior lumbar spine, and total body was assessed using dual-energy X-ray absorptiometry (DXA). LBM and FBM were derived from the total-body scans. General health, including current menopausal status, hormone replace therapy use, medication use, and physical activity, was assessed by questionnaires. At the end of the study, 44% of the women were postmenopausal. After controlling for baseline aBMD, current menopausal status, and current hormone replacement therapy, we found that change in LBM was independently associated with change in aBMD of the proximal femur (P = 0.001). The cross-sectional analyses also indicated that LBM was a significant determinant of aBMD of all three DXA-scanned sites at both baseline and follow-up. These novel longitudinal data highlight the important contribution of LBM to the maintenance of proximal femur bone mass at a key time in women’s life span, the years surrounding menopause.
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Acknowledgment
The Canadian Institutes of Health Research funded this study. Drs. McKay and Liu-Ambrose are Michael Smith Foundation for Health Research Career Scholars. Dr. Khan is a Canadian Institutes of Health Research (Institute of Musculoskeletal Health and Arthritis) New Investigator. Ms. Sherar is a Community and Population Health Research Strategic Training Fellow and Mr. Mundt is a Canadian Institutes of Health Research Regional Partnership Program Doctoral Research Scholar.
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Liu-Ambrose, T., Kravetsky, L., Bailey, D. et al. Change in Lean Body Mass Is a Major Determinant of Change in Areal Bone Mineral Density of the Proximal Femur: A 12-Year Observational Study. Calcif Tissue Int 79, 145–151 (2006). https://doi.org/10.1007/s00223-006-0098-z
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DOI: https://doi.org/10.1007/s00223-006-0098-z