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Whey Protein Before and During Resistance Exercise Has No Effect on Muscle Mass and Strength in Untrained Young Adults."PURPOSE: To determine the effects of whey protein before and during resistance exercise (RE) on body composition and strength in young adults.
METHODS: Participants were randomized to ingest whey protein (PRO; 0.3g·kg-1 protein; n=9, 24.58±1.8 yrs, 88.3±17.1 kg, 172.5±8.0 cm) or placebo (PLA; 0.2g·kg-1 corn-starch maltodextrin + 0.1g·kg-1 sucrose; n=8, 23.6±4.4 yrs, 82.6±16.1 kg, 169.4±9.2 cm) during RE (3 sets of 6-10 repetitions for 9 whole-body exercises), which was performed 4 days per week for 8 weeks. Protein and placebo were mixed with water (600ml) and 50% of the solution containing 0.15g·kg-1 of protein or placebo was consumed immediately prior to the start of exercise and ~1.9% of the remaining solution containing ~0.006g·kg-1 of protein or placebo was consumed immediately following each training set. Before and after the study, measures were taken for lean tissue mass (dual energy x-ray absorptiometry), muscle size of the elbow and knee flexors and extensors and ankle dorsi flexors and plantar flexors (ultrasound), and muscle strength (1-repetition maximum chest press).
RESULTS: There was a significant increase (p<0.05) in muscle size of the knee extensors (PRO: 0.6±0.4 cm, PLA: 0.1±0.5 cm), knee flexors (PRO: 0.4±0.6 cm, PLA: 0.5±0.7 cm), ankle plantar flexors (PRO: 0.6±0.7 cm, PLA: 0.8±1.4 cm), and chest press strength (PRO: 16.6±11.1 kg, PLA: 9.1±14.6 kg) over time, with no differences between groups.
CONCLUSION: The ingestion of whey protein immediately before the start of exercise and again following each training set has no effect on muscle mass and strength in untrained young adults." -
http://www.ncbi.nlm.nih.gov/pubmed/22806076