Nope, not even an exaggeration, as long as significant protein is present you'll GAIN muscle on aas regardless of what would be considered minor at best external factors such as high cardio, no lifting, lack of excess calories etc.
Now if you're speaking of hindrance to gains in bb'er terms (optimal muscle building) in the absence of adjusted appropriate diet & lifting, or in the presence of excessive cardio then that's correct.
But that's not the topic. I said regardless of the amount, cardio’s catabolism is insubstantial during aas’ anabolism. This is clearly evidenced by the fact that even the weakest steroid will create a fantastic anabolic environment because these powerful hormones whose chemical signals (within the intact system)
cannot be disobeyed. Numerous clinical studies have proven even LOWLY VAR’S anabolic ability to reverse the most powerful degenerative diseases often classified as ACUTE CATABOLIC INJURY (far more potent than any cardio training regimen you can generate). It BUILDS, not merely PRESERVES muscle (as you cited) in the aforementioned disease category, otherwise age deteriorating older men, as well as in the bodies of traumatically damaged children.
Of course you’re entitled to your express opinion, the right of open forum participation, but I’m not voicing mere opinions, but rather actual facts as exhibited below in just a few of the exhaustingly abundant examples from medical research. Oh, and none of them include exercise of any kind, nor do any use your “spot on diet”, yet they all not only negate or offset but completely reverse multiple extreme muscle deleterious conditions
that far exceed any possible cardio exercising threats to muscle development resulting in MUSCLE BUILDING…
Older men typically 60-87yrs old:
http://www.ncbi.nlm.nih.gov/sites/en...ubmed_RVDocSum
http://www.ncbi.nlm.nih.gov/sites/en...ubmed_RVDocSum
http://www.ncbi.nlm.nih.gov/sites/en...ubmed_RVDocSum
Severely burned children:
http://www.ncbi.nlm.nih.gov/sites/en...ubmed_RVDocSum
http://www.ncbi.nlm.nih.gov/sites/en...ubmed_RVDocSum[/CENTER]