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The mean MMG signal changes of twelve subjects for eight dominant-leg muscles following the unexpected perturbations with four directions and four intensities (n = 12). (Note: The red dotted line specifies the start of the balance perturbation; MMG, mechanomyography; GMed, gluteus medius; AM, adductor magus; SA, sartorius; GMax, gluteus maximus; RF, rectus femoris; ST, semitendinosus; TA, tibialis anterior; MG, gastrocnemius medialis.)
