Of course this all comes back to fatigue, and the fact that the largest fibers are the most susceptible to muscle damage. We know that the sets earliest in a workout are the most stimulating - and then we see a massive drop off in the dose response to volume. Each set we do causes increased CNS fatigue that causes a reduction in motor unit recruitment to the largest type of fibers. Now are no longer stimulating THE FIBERS THAT ACTUALLY BUILD MUSCLE. All you are doing at that point is creating more muscle damage WHICH IS NOT CONDUCIVE TO MORE GROWTH.
When training to failure, the plateau seems to happen somewhere between 6-9 sets per muscle group ON AVERAGE.
To make things simple... if we know there is a plateau (and you cannot just do a zillion sets and continue to grow - duh), anything after that plateau is becoming counterproductive due to the muscle damage/fatigue occurring vs muscle growth.
There are actually several different "takes" on what junk volume is considered - this is just my interpretation of what someone is asking when they bring up junk volume
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