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Variation of static ankle mechanical impedance with muscle activation (Lee et al., 2012c). Polar plots show magnitude of restoring torque evoked by displacement in different directions. Left panel: Tibialis anterior active. Right panel: Soleus active. MVC denotes maximum voluntary contraction. Solid lines: mean of all subjects. Dotted lines: mean ± standard error. Note the pronounced weakness in inversion-eversion, the direction of most ankle injuries.
