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After 14 weeks of resistance training, only the protein group showed muscle fiber hypertrophy of the trained leg muscles. Type I and type II muscle fiber cross-sectional area of the vastus lateralis increased by 18% ± 5% (P < .01) and 26% ± 5% (P < .01), respectively, in the protein group, whereas no significant change occurred in the carbohydrate group.

The protein group gained 9% ± 2% (P < .01) in squat jump height, whereas no significant change occurred in the carbohydrate group.