Effects of weight training and a whey beverage on muscular hypertrophy and strength in trained males
Nielsen, Anthony Edward
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Background: Ingestion of protein beverages post resistance exercise have been shown to increase muscle mass and strength.;Purpose: The purpose of this investigation was to compare whey protein to whey/carbohydrate supplementation during eight week concentric/eccentric resistance training to determine if one beverage was superior in promoting muscular strength and hypertrophy than the other.;Methods: Twenty resistance-trained males participated in this study and were randomly assigned to either a whey protein or whey/carbohydrate beverage following an 8-week concentric/eccentric resistance training protocol. Seventeen subjects completed all testing and were included in the statistical analysis. Muscle strength was assessed by a one-rep maximum on the bench press and leg press, and isometric knee flexion and extension assessed using the Humac Dynamometer. Anthropometric circumference measurements and body composition were also taken. All measurements were collected at baseline, midpoint, and upon completion of the study.;Results: Both supplemental groups experienced significant increases in muscle strength for 1RM for bench and leg press (p ≤ 0.001), and knee extension (p ≤ 0.002), muscular hypertrophy (p ≤ 0.02), and lean body mass (p ≤ 0.02).;Conclusion: There was a significant increase in muscle strength, hypertrophy, and lean body mass following the eight-week concentric/eccentric resistance training study for both supplement groups. Therefore, a resistance training program is effective increasing muscle mass and strength regardless of supplementation.