Quote (tommyd323 @ Aug 24 2016 09:16am)
The currently accepted amount of protein required to achieve maximal stimu- lation of myofibrillar protein synthesis (MPS) following resistance exercise is 20–25 g. However, the influence of lean body mass (LBM) on the response of MPS to protein ingestion is unclear. Our aim was to assess the influence of LBM, both total and the amount activated during exercise, on the maximal response of MPS to ingestion of 20 or 40 g of whey protein following a bout of whole-body resistance exercise. Resistance-trained males were assigned to a group with lower LBM (≤65 kg; LLBM n = 15) or higher LBM (≥70 kg; HLBM n = 15) and participated in two trials in random order. MPS was mea- sured with the infusion of 13C6-phenylalanine tracer and collection of muscle biopsies following ingestion of either 20 or 40 g protein during recovery from a single bout of whole-body resistance exercise. A similar response of MPS during exercise recovery was observed between LBM groups following protein ingestion (20 g – LLBM: 0.048 ` 0.018% h 1; HLBM: 0.051 ` 0.014% h 1; 40 g – LLBM: 0.059 ` 0.021% h 1; HLBM: 0.059 ` 0.012% h 1). Overall (groups combined), MPS was stimulated to a greater extent following inges- tion of 40 g (0.059 ` 0.020% h 1) compared with 20 g (0.049 ` 0.020% h 1; P = 0.005) of protein. Our data indicate that ingestion of 40 g whey protein following whole-body resistance exercise stimulates a greater MPS response than 20 g in young resistance-trained men. However, with the current doses, the total amount of LBM does not seem to influence the response.
the next statement is the more controversial i would say. the study suggests that muscle protein synthesis after exercise, fueled by protein intake, is not body mass dependent. so typically people would advise protein intakes based on body mass or suggest that only 20-25g can be utilized at a time. this study challenges both of those things