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    Stability of lower limb minimal perceptible difference in floor height during hopping stretch-shortening cycles

    Access Status
    Fulltext not available
    Authors
    Travers, M.
    Debenham, J.
    Gibson, William
    Campbell, Amity
    Allison, Garry
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Travers, Mervyn J. and Debenham, James and Gibson, William and Campbell, Amity and Allison, Garry T. 2013. Stability of lower limb minimal perceptible difference in floor height during hopping stretch-shortening cycles. Physiological Measurement. 34 (10): pp. 1375-1386.
    Source Title
    Physiological Measurement
    DOI
    10.1088/0967-3334/34/10/1375
    ISSN
    0967-3334
    URI
    http://hdl.handle.net/20.500.11937/11776
    Collection
    • Curtin Research Publications
    Abstract

    This study aimed to investigate a novel proprioceptive test, the minimal perceptible difference (MPD) test, which assessed participants' ability to perceive floor height changes whilst hopping. Sixteen healthy volunteers performed multiple trials of five hops on a custom built sleigh apparatus that permitted a floor height change (range 3 –48 mm) or no change, as dictated by a structured searching algorithm. Minimum detected surface height change was recorded for eight different hopping conditions (factors–technique: alternate/bilateral hopping; side: dominant/non-dominant; direction of change: up/down) over two separate testing occasions. Within day and between day reliability were assessed using intraclass correlation coefficient (ICC) and 95% confidence intervals. The only factor which significantly influenced the sensitivity of subjects to detect changes in floor height was the hopping technique (bilateral or alternate). The mean MPD was significantly lower (p<0.0001) for the bilateral hopping technique (MPDmean = 15.7 mm) when compared to the alternate hopping technique (MPDmean = 26.6 mm). All bilateral hopping techniques yielded moderate to high ICC for within (0.60–0.79) and between day (0.67–0.88) reliability.The results suggest that the bilateral hopping MPD assessment is a reliable, functional assessment of proprioception sensitivity during repeated stretch-shortening cycles that may better reflect human gait than established static assessment. Increased sensitivity to detection during bilateral hopping may reflect strategy dependent utility of proprioceptive information.

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