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Mean and Standard Error for (A) Muscle main effects for the delta score in RMS-amplitude (B) co-contraction index (CI) between dorsiflexors and plantar flexors, and between knee extensors and knee flexors in younger (filled symbols) and older (open symbols) adults. *Age differences, tTime main effect. #muscles that are different from dorsiflexors; &muscles that are different from knee extensors.
