Protein Supplementation Does Not Affect Myogenic Adaptations to Resistance Training

It has been proposed that protein supplementation during resistance exercise training enhances muscle hypertrophy. The degree of hypertrophy during training is controlled in part through the activation of satellite cells and myonuclear accretion. Purpose: This study aimed to determine the efficacy of protein supplementation (and the type of protein) during traditional resistance training on myofiber cross-sectional area, satellite cell content, and myonuclear addition. Methods: Healthy young men participated in supervised whole-body progressive resistance training 3 d·wk−1 for 12 wk. Participants were randomized to one of three groups ingesting a daily 22-g macronutrient dose of soy–dairy protein blend (PB, n = 22), whey protein isolate (WP, n = 15), or an isocaloric maltodextrin placebo (MDP, n = 17). Lean mass, vastus lateralis myofiber-type–specific cross-sectional area, satellite cell content, and myonuclear addition were assessed before and after resistance training. Results: PB and the pooled protein treatments (PB + WP = PRO) exhibited a greater whole-body lean mass %change compared with MDP (P = 0.057 for PB) and (P = 0.050 for PRO), respectively. All treatments demonstrated similar leg muscle hypertrophy and vastus lateralis myofiber-type–specific cross-sectional area (P

from Sports Medicine via xlomafota13 on Inoreader http://ift.tt/2pI3zkf
via IFTTT