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Mean values and standard error (error bars) of vastus lateralis (VL) muscle thickness (A), pennation angle (B), and normalized fascicle length (C; normalized to femur length) of non-athletes (black) and athletes (white) in early adolescence (EA), late adolescence (LA), and young adulthood (YA). #Statistically significant effect of activity (p < 0.05). ∗Statistically significant effect of age (p < 0.05).
