Abstract
The objective of the study was to determine the association between AAC and neuromuscular function over 5 years. Participants in this study were ambulant women over 70 years old residing in Perth, Western Australia who participated in the Calcium Intake Fracture Outcomes Study, a randomised controlled trial of calcium supplementation. 1046 women (mean age = 74.9 ± 2.6 years; BMI = 27.1 ± 4.4 kg/m2) were included. Lateral spine images captured during bone density testing were scored for AAC (AAC24; 0–24) at baseline. Severe AAC (AACsev) was defined using established cut points (AAC24 ≥ 6). At baseline and follow-up, isometric grip strength was assessed using a dynamometer. Mobility was assessed by the Timed-Up-and-Go (TUG) test. Using pre-defined criteria, muscle weakness was considered as grip strength < 22 kg and poor mobility defined as TUG > 10.2 s. A subset of women had appendicular lean mass (ALM) determined by dual-energy X-ray absorptiometry at baseline and follow-up (n = 261). AACsev was evident in 193 (18.5%) women. Average decline in grip strength after 5 years was greater in those with AACsev than those without (3.6 ± 3.7 vs. 2.9 ± 4.2 kg; p = 0.034). This remained significant after adjustment for age, treatment allocation, diabetes, smoking history, renal function, medical record-derived prevalent vascular disease, BMI and physical activity (β = − 0.184; 95% confidence interval: − 0.361, − 0.008; p = 0.040). AACsev was not associated with 5-year changes in TUG or ALM in univariable or multivariable analyses (all p > 0.05). In older women, severe aortic calcification was associated with greater 5-year decline in muscle strength, but not TUG or ALM. These findings support the concept that vascular disease may have an effect on the loss of muscular strength.

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Acknowledgements
The authors would like to thank all the participants of the CAIFOS study and all study personnel involved in data collection and the operation of the study.
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AJR: Study concept and design, data analysis, interpretation of data and manuscript preparation. JRL: Interpretation of data and manuscript preparation. DSS: Interpretation of data and manuscript preparation. DPK: Interpretation of data and manuscript preparation. JTS: Acquisition of data, interpretation of data and manuscript preparation. PRE: Interpretation of data and manuscript preparation. RLP: Study concept and design, acquisition of data, interpretation of data and manuscript preparation.
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Alexander J. Rodríguez, Joshua R. Lewis, David S. Scott, Douglas P. Kiel, John T. Schousboe, Peter R. Ebeling and Richard L. Prince declare that they have no conflict of interest.
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Trial registration: Australian New Zealand Clinical Trials Registry ACTRN12615000750583. The study conformed to all ethical requirements according to the Human Research Ethics Committee of the Western Australian Department of Health (DOHWA HREC), project number #2009/24. All participants gave informed consent.
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Rodríguez, A.J., Lewis, J.R., Scott, D.S. et al. Aortic Calcification is Associated with Five-Year Decline in Handgrip Strength in Older Women. Calcif Tissue Int 103, 589–598 (2018). https://doi.org/10.1007/s00223-018-0458-5
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DOI: https://doi.org/10.1007/s00223-018-0458-5