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(A) Gluteus medius (gm) and (B) Gluteus maximus (GM) electromyographic activity during functional exercises. CAI, chronic ankle instability; Yan%, percent maximum voluntary contraction during anterior; Ypm%, posteromedial approach of Y balance; Ypl%, posterolateral approach of Y balance; Sls%, single-leg squat without Swiss ball; Slsb%, single-leg squat with swiss ball.
