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    The Association between Seasonal Variation in Vitamin D, Postural Sway, and Falls Risk: An Obversational Cohort Study

    200129_130444_The_association_between_seasonal_variation_in_Vitamin_D__postural_sway_and_falls_risk.pdf (1.138Mb)
    Access Status
    Open access
    Authors
    Bird, M.
    Hill, Keith
    Robertson, I.
    Ball, M.
    Pittaway, J.
    Williams, A.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Bird, M. and Hill, K. and Robertson, I. and Ball, M. and Pittaway, J. and Williams, A. 2014. The Association between Seasonal Variation in Vitamin D, Postural Sway, and Falls Risk: An Obversational Cohort Study. Journal of Ageing Research. 2013: Article ID 751310.
    Source Title
    Journal of Ageing Research
    DOI
    10.1155/2013/751310
    ISSN
    2090 2204
    School
    School of Physiotherapy
    Remarks

    This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/. Please refer to the licence to obtain terms for any further reuse or distribution of this work.

    URI
    http://hdl.handle.net/20.500.11937/32602
    Collection
    • Curtin Research Publications
    Abstract

    Introduction: Low serum vitamin D levels are associated with increased postural sway. Vitamin D varies seasonally. This study investigates whether postural sway varies seasonally and is associated with serum vitamin D and falls. Methods: In a longitudinal observational study, eighty-eight independently mobile community-dwelling older adults (69.7 ± 7.6 years) were evaluated on five occasions over one year, measuring postural sway (force platform), vitamin D levels, fall incidence, and causes and adverse outcomes. Mixed-methods Poisson regression was used to determine associations between measures. Results: Postural sway did not vary over the year. Vitamin D levels varied seasonally (P < 0.001), peaking in summer. Incidence of falls (P=0.01) and injurious falls (P=0.02) were lower in spring, with the highest fall rate at the end of autumn. Postural sway was not related to vitamin D (P=0.87) or fall rates, but it was associated with fall injuries (IRR 1.59 (CI 1.14 to 2.24, P=0.007). Conclusions: Postural sway remained stable across the year while vitamin D varied seasonally. Participants with high values for postural sway demonstrated higher rates of injurious falls. This study provides important evidence for clinicians and researchers providing interventions measuring balance outcomes across seasons.

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