The effects of varying types of protein consumption on measures of strength in collegiate football players

Methods 74 NCAA Division III male football players were matched according to weight and randomly assigned in a double blind manner into 4 groups to consume either 40 grams of a whey and casein protein blend (WC) (94.5 ± 21.8 kg, 19.6 ± 2.5 yrs, 180 ± 6 cm, 18.6 ± 8.9 %) , whey protein (WP) (90.4 ± 15.9 kg, 19.6 ± 1.3 yrs, 177.8 ± 6.6 cm, 16.5 ± 6.7 %), casein protein (CC) (107.2 ± 14 kg, 19.7 ± 1.1 yrs, 182 ± 6 cm, 21.6 ± 7 %), or a glucose control (GC) (96.4 ± 18.1 kg, 19.7 ± 1.4 yrs, 180 ± 6 cm, 16 ± 5.1 %) post-exercise for eight weeks. In addition to the supplementation, subjects participated in a supervised 5-day per week linearly periodized training program. At 0 and 8-weeks, subjects underwent DEXA body composition analysis, 1RM strength, 40 yard dash, vertical jump, and 5-10-5 testing sessions. Data were analyzed using a 4 x 2 mixed factorial ANOVA. Follow-up one way ANOVA were used as a post-hoc measure with delta scores. All data is presented as mean ± SD changes from baseline after 60-days.