The aim of this study was to investigate anticipatory (APA), simultaneous (SPA) and compensatory (CPA) postural adjustments in individuals with and without chronic ankle instability (CAI) as they kicked a ball while standing in a single-leg stance on a stable and unstable surface. Electromyographic activity (EMG) of postural muscles and center of pressure (COP) displacements were calculated and their magnitudes analyzed during the postural adjustment intervals.


The activities of postural muscles were also studied using principal component analysis (PCA) to identify between-group differences in patterns of muscle activation.

The PCA revealed that CAI participants assemble different sets of muscle activation to compensate for their ankle instability, primarily activating hip/spine muscles.

Références bibliographiques :

Rios JL et al. Individuals with chronic ankle instability compensate for their ankle deficits using proximal musculature to maintain reduced postural sway while kicking a ball. Hum Mov Sci. 2015 Jul 15;43:33-44. doi: 10.1016/j.humov.2015.07.001. Article sous presse.

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