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Implications of intra-limb variability on asymmetry analyses

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Author
Exell, Timothy A.
Irwin, Gareth
Gittoes, Marianne J.R.
Kerwin, David G.
Date
2012
Type
Article
Publisher
Taylor & Francis
ISSN
0264-0414 (Print)
1466-447X (Online)
Metadata
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Abstract
The aim of this study was to investigate the effect of intra-limb variability on the calculation of asymmetry with the purpose of informing future analyses. Asymmetry has previously been quantified for discrete kinematic and kinetic variables; however, intra-limb variability has not been routinely included in these analyses. Synchronized lower-limb kinematic and kinetic data were collected from eight trained athletes (age 22 ± 5 years, mass 74.0 ± 8.7 kg, stature 1.79 ± 0.07 m) during maximal velocity sprint running. Asymmetry was quantified using a modified version of the symmetry angle for selected kinematic and kinetic variables. Significant differences (P < 0.05) between left and right values for each variable were calculated to indicate intra-limb variability relative to between-limb differences. Significant asymmetry was present in only 39% of kinematic variables and 23% of kinetic variables analysed. Large kinetic asymmetry values (>90%) were calculated for some athletes that were not significant, due to large intra-limb variability. Variables that displayed significant asymmetry were athlete-specific. Findings highlight the potential for misleading results if intra-limb variability is not included in asymmetry analyses. The exclusion of asymmetry scores for variables not displaying significant asymmetry will be useful when calculating overall asymmetry for different participants and could be applied to future running gait analyses.
Journal/conference proceeding
Journal of Sports Sciences;
Citation
Journal of Sports Sciences, 30 (4), 403-409
URI
http://hdl.handle.net/10369/4050
DOI
http://dx.doi.org/10.1080/02640414.2011.647047
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  • Sport Research Groups [620]

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