Agree, I 'think' he misinterpreted what it really was. Instead of 'sarcoplasmic' hypertrophy, maybe it's more 'water, glycogen, mitochondria' etc. The idea I was meaning though, was the irrational hypertrophy where the cell size outstrips the energy systems if they don't supercompensate to the same degree. I was looking at the part you were speaking about WRT mitochondria (atp generation, etc.). 'Standard' heavy training is shown to stimulate very little to almost no increase in mitochondria, the mitochondrial density drops with hypertrophy. It might be yet another area (besides ribosomes and satellite cell donation) that can put a ceiling on continued hypertrophy?