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Effects of a 16-wk resistance training program on type II myofiber cross-sectional area (CSA) (A) and distribution of type IIa and type IIx myofibers (B) in young and old subjects. Bars are means ± SE. Results of each age × time ANOVA are shown in A and B. *Post different from Pre within group as determined post hoc by Tukey's HSD test, P < 0.05.
