Balance failure in single limb stance due to ankle sprain injury: An analysis of center of pressure using the fractal dimension method

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Title: Balance failure in single limb stance due to ankle sprain injury: An analysis of center of pressure using the fractal dimension method
Authors: Doherty, Cailbhe
Bleakley, Chris J.
Hertel, Jay
Caulfield, Brian
Ryan, John
Delahunt, Eamonn
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Date: May-2014
Abstract: Instrumented postural control analysis plays an important role in evaluating the effects of injury on dynamic stability during balance tasks, and is often conveyed with measures based on the displacement of the center-of-pressure (COP) assessed with a force platform. However, the desired outcome of the task is frequently characterized by a loss of dynamic stability, secondary to injury. Typically, these failed trials are discarded during research investigations, with the potential loss of informative data pertaining to task success. The novelty of the present study is that COP characteristics of failed trials in injured participants are compared to successful trial data in another injured group, and a control group of participants, using the fractal dimension (FD) method. Three groups of participants attempted a task of eyes closed single limb stance (SLS): twenty-nine participants with acute ankle sprain successfully completed the task on their non-injured limb (successful injury group); twenty eight participants with acute ankle sprain failed their attempt on their injured limb (failed injury group); sixteen participants with no current injury successfully completed the task on their non-dominant limb (successful non-injured group). Between trial analyses of these groups revealed significant differences in COP trajectory FD (successful injury group: 1.58 ± 0.06; failed injury group: 1.54 ± 0.07; successful non-injured group: 1.64 ± 0.06) with a large effect size (0.27). These findings demonstrate that successful eyes-closed SLS is characterized by a larger FD of the COP path when compared to failed trials, and that injury causes a decrease in COP path FD.
Funding Details: Health Research Board
Type of material: Journal Article
Publisher: Elsevier
Journal: Gait & Posture
Volume: 40
Issue: 1
Start page: 172
End page: 176
Copyright (published version): 2014 Elsevier
Keywords: Personal sensingAnkle jointBiomechanicsKineticsPostural balance
DOI: 10.1016/j.gaitpost.2014.03.180
Language: en
Status of Item: Peer reviewed 2017-02-03T13:24:15Z
Appears in Collections:Public Health, Physiotherapy and Sports Science Research Collection
Insight Research Collection
Institute for Sport & Health Research Collection

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