The purpose of this study was to compare the effects of: 1) two sets of resistance training without supplementation; 2) one set of resistance training with whey protein plus leucine supplementation; and 3) one set of resistance training with a carbohydrate placebo on body weight (BW), strength, muscular endurance, and body composition. Untrained adult males (N=39, age±SD = 22.7±2.8 years) were randomly assigned to a non-supplement (NON-SUP; n=13), protein (PRO; n=13), or a carbohydrate (CHO; n=13) group and performed leg extensions and bench press (NON-SUP = 2 sets, no supplement; PRO = 1 set, protein supplement; CHO = 1 set, carbohydrate) 3 x week at 80% of 1-RM for 8 weeks. Mixed factorial ANOVAs indicated only significant (p<0.05) main effects for time for leg extension 1RM (pre = 82.5±22.4kg; post = 99.2±23.2kg), leg extension endurance (pre = 12±4 reps; post = 19±7reps), bench press 1RM (pre = 64.7±17.8kg; post = 77±20.4kg), and bench press endurance (pre = 7±2 reps; post = 13±4reps). These findings indicated that two sets of resistance training without supplementation, one set of resistance training plus whey protein and leucine supplementation, and one set of resistance training plus a carbohydrate supplement, resulted in similar strength, endurance, and body composition responses.
|Original language||English (US)|
|Number of pages||12|
|Journal||Journal of Exercise Physiology Online|
|State||Published - Oct 1 2009|
- Fat-free weight
ASJC Scopus subject areas
- Physiology (medical)