The effects of whey protein and leucine supplementation on strength, muscular endurance, and body composition during resistance training

Michelle Mielke, Terry J. Housh, Moh H. Malek, Travis W. Beck, Richard J. Schmidt, Glen O. Johnson, Dona J. Housh

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

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 languageEnglish (US)
Pages (from-to)39-50
Number of pages12
JournalJournal of Exercise Physiology Online
Volume12
Issue number5
StatePublished - Oct 2009

Keywords

  • Carbohydrate
  • Fat-free weight
  • Strength

ASJC Scopus subject areas

  • Physiology (medical)

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