ohne ausreichende nahrungsmittelzufuhr wäre es nie möglich aufzubauen!
Ja gut, allerdings sagt das nun nichts über den tatsächlichen Proteinbedarf.

Für entOn:
Vielleicht steigt der Grundbedarf an Protein unter bestimmten Bedingungen ja auch an...wer weiß...
So lange das alles unsicher ist, würde ich versuchen auf der sicheren Seite zu sein.
J Appl Physiol. 1992 Aug;73(2):767-75.

Protein requirements and muscle mass/strength changes during intensive training in novice bodybuilders.

Lemon PW, Tarnopolsky MA, MacDougall JD, Atkinson SA.

School of Biomedical Sciences, Kent State University, Ohio 44242.

This randomized double-blind cross-over study assessed protein (PRO) requirements during the early stages of intensive bodybuilding training and determined whether supplemental PRO intake (PROIN) enhanced muscle mass/strength gains. Twelve men [22.4 +/- 2.4 (SD) yr] received an isoenergetic PRO (total PROIN 2.62 g.kg-1.day-1) or carbohydrate (CHO; total PROIN 1.35 g.kg-1.day-1) supplement for 1 mo each during intensive (1.5 h/day, 6 days/wk) weight training. On the basis of 3-day nitrogen balance (NBAL) measurements after 3.5 wk on each treatment (8.9 +/- 4.2 and -3.4 +/- 1.9 g N/day, respectively), the PROIN necessary for zero NBAL (requirement) was 1.4-1.5 g.kg-1.day-1. The recommended intake (requirement + 2 SD) was 1.6-1.7 g.kg-1.day-1. However, strength (voluntary and electrically evoked) and muscle mass [density, creatinine excretion, muscle area (computer axial tomography scan), and biceps N content] gains were not different between diet treatments. These data indicate that, during the early stages of intensive bodybuilding training, PRO needs are approximately 100% greater than current recommendations but that PROIN increases from 1.35 to 2.62 g.kg-1.day-1 do not enhance muscle mass/strength gains, at least during the 1st mo of training. Whether differential gains would occur with longer training remains to be determined.
Und wer weiß, so lange die Frage nicht 100%ig sicher geklärt ist, würde ich folgendes Zitat von Peter Lemon nicht unbedingt unter den Teppich kehren...
...although not always appreciated, it is possible that, even if a measure like nitrogen balance does not indicate an increased protein requirement, exercise performance could still be enhanced by a greater protein intake, i.e., the additional protein might alter a metabolic process enhancing energy utilization for endurance performance or could stimulate anabolism resulting in greater muscle mass and/or strength gains.