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    Age Effects on Mediolateral Balance Control

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    Author
    Lizama, LEC; Pijnappels, M; Faber, GH; Reeves, PN; Verschueren, SM; van Dieen, JH
    Date
    2014-10-28
    Source Title
    PLoS One
    Publisher
    PUBLIC LIBRARY SCIENCE
    University of Melbourne Author/s
    Cofre Lizama, Luis Eduardo
    Affiliation
    Medicine and Radiology
    Metadata
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    Document Type
    Journal Article
    Citations
    Lizama, L. E. C., Pijnappels, M., Faber, G. H., Reeves, P. N., Verschueren, S. M. & van Dieen, J. H. (2014). Age Effects on Mediolateral Balance Control. PLOS ONE, 9 (10), https://doi.org/10.1371/journal.pone.0110757.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/254708
    DOI
    10.1371/journal.pone.0110757
    Abstract
    BACKGROUND: Age-related balance impairments, particularly in mediolateral direction (ML) may cause falls. Sufficiently sensitive and reliable ML balance tests are, however, lacking. This study is aimed to determine (1) the effect of age on and (2) the reliability of ML balance performance using Center of Mass (CoM) tracking. METHODS: Balance performance of 19 young (26±3 years) and 19 older (72±5 years) adults on ML-CoM tracking tasks was compared. Subjects tracked predictable and unpredictable target displacements at increasing frequencies with their CoM by shifting their weight sideward. Phase-shift (response delay) and gain (amplitude difference) between the CoM and target in the frequency domain were used to quantify performance. Thirteen older and all young adults were reassessed to determine reliability of balance performance measures. In addition, all older adults performed a series of clinical balance tests and conventional posturography was done in a sub-sample. RESULTS: Phase-shift and gain dropped below pre-determined thresholds (-90 degrees and 0.5) at lower frequencies in the older adults and were even lower below these frequencies than in young adults. Performance measures showed good to excellent reliability in both groups. All clinical scores were close to the maximum and no age effect was found using posturography. ML balance performance measures exhibited small but systematic between-session differences indicative of learning. CONCLUSIONS: The ability to accurately perform ML-CoM tracking deteriorates with age. ML-CoM tracking tasks form a reliable tool to assess ML balance in young and older adults and are more sensitive to age-related impairment than posturography and clinical tests.

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