Yes, but you seem to think the maximum speed is defined by the powers of the brain, where I say it is defined by the muscle itself.
Which is utterly physiological and anatomical nonsense
Again: can you explain me how muscles are conditioned to fast playing if not through neurological signaling? What do you think PHYSICALLY change in the muscles fibers that make you play faster. PLEASE describe to me the physiological process that make muscles fast (release of nitrogen, increase of myofibrils, water retention)
You don't seem to understand that endurance athleticism depends on available energy sources (ATP, Phosphate Creatine, Lactate, Glycogen, Fatty Acids) and fatigue IS NOT a byproduct of hard movement but of "energy consuming movements"
That's also why the calories consumed playing the piano are almost irrelevant; you don't seen to understand the impact of either muscle conditioning and resistance of big muscles that has a weight bearing (100 + pounds) task while the weight bearing potential at the piano is less than 2 OUNCES
Sorry you're everything but an athlete!
Finally I'd like to understand what do you thinkg fatigue is all about
You really seem to get your knowledge from the superficial appareance of things
So we use the word fatigue to mean "tired of doing something" but why?
Physiologically there's a more deep reason that doesn't allow such platitude nonsense
Fatigue either come from running out of energy (which could never happen at the piano even if you were playing for 10 hours) lack of oxygen and proper oxygenation or from causing some kind of wearing and tearing of the ligaments, tendongs and muscles (fatigue can also be caused by ill health: adrenal weakness, electrolites deficiencies, orthostatic postural intolerance and so on)
Wearing and tearing of ligaments can happen only when they repeatedly scratch on a surface. Our anatomy doesn't allow this to happen only wrong alignment of our body
As for muscles only co-contraction can tear them apart.
Co-contraction is contracting a muscle without releasing another.
This is one of the most crucial aspect of speed and it's not controlled by the physical nature of the muscles but the neurological nature of the brain-muscle connections
So you don't only should explain to us what other forms of fatigue are there and what changes physically in the muscle when you can play faster. Why again you don't observe magnetic resonance studies and pictures to see that nothing ever change in the muscle structure? So again if nothing change in the muscle structure how in the world can speed at the piano defined by the muscles itself
What the hell the muscle do to define their maximum speed?
Contract and release quickly? That's a neurological process not a physical one
What else is there?
If you would take the time to read something about focal dystonia (especially studies) and how suddenly prevent a pianist from playing (especially fast) you would understand better it all ...