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[Purpose] The present study investigated the surface electromyographic activity of the lower leg in dynamic balance of recreational athletes with functional ankle instability (FAI) and stable ankles (control). [Methods] Twenty recreational athletes were divided into a functional ankle instability group (10 males) and a stable ankle group (10 males). Their dynamic balance was assessed with the star excursion balance test (SEBT). For all the participants, surface electromyographic (EMG) activities of 7 muscles were evaluated by a Myosystem 1400A unit during the SEBT in 8 directions. [Results] The SEBT scores of the functional ankle instability group (FAIG) were significantly lower than those of the stable ankle group (SAG) during dynamic balance in the anterior, lateral, anterolateral, posteromedial, and posterolateral directions. The EMG activities of TA and PL in the anterior, anteromedial & anterolateral directions, of TP and SE in the posterior, posteromedial and posterolateral directions, and of VL in the lateral direction were significantly lower in FAIG than in SAG. [Conclusion] This study showed that functional ankle stability a affected EMG activity of the lower leg in dynamic balance.

The Effect of the EMG Activity of the Lower Leg with Dynamic Balance of the Recreational Athletes with Functional Ankle Instability