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Age-related difference in MVC (A), Peak Quadriceps CSA (B), TTPE (C), Maximal twitch df/dt (D), and Activation capacity (E), p values denoted by *p < .05, **p < .01, ***p < .001, ****p < .0001. ACSA = Anatomical cross sectional area; MVC = Maximal voluntary contraction; TTPE = Time to peak EMG amplitude.
