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Advisor(s)
Abstract(s)
This study aims to evaluate bilateral ankle antagonist co-activation during compensatory postural responses, including short latency responses (SLR) and medium latency responses (MLR), in response to a unilateral sudden ankle inversion in subjects with chronic ankle instability (CAI).
Methods
Twenty-four participants with CAI and 20 controls participated in the present study. Bilateral eletromyography of peroneus longus (PL), peroneus brevis (PB), tibialis anterior (TA) and soleus (SOL) muscles was collected during a unilateral sudden inversion perturbation (30°) to assess antagonist co-activation of SOL/TA and TA/P pairs during SLR and MLR in both support and perturbed positions.
Results
Compared to control group, participants with CAI presented: (1) bilateral increased antagonist co-activation of SOL/TA MLR in the support position; and (2) decreased antagonist co-activation of TA/P MLR of uninjured limb in the support position and of injured limb in the perturbed position.
Conclusions
CAI involves deregulation of ankle antagonist co-activation of MLR in both injured and uninjured limbs.
Description
Keywords
Chronic ankle instability Postural control Electromyography Antagonist co-activation Short latency responses Joint Instability Medium latency responses Muscle Contraction
Citation
Sousa, A. S. P. (2018). Antagonist co-activation during short and medium latency responses in subjects with chronic ankle instability. Journal of Electromyography and Kinesiology, 43, 168–173. https://doi.org/10.1016/j.jelekin.2018.10.006
Publisher
Elsevier