I don’t understand how you consider short approach jumping low cns. I consider these very high cns-stress.The better jumper the higher the stress. If I jump 750 from 13 steps 10 times it takes alot of concentration,adrenaline and power output.And the concentration starts way before the session even starts because it is the most important session of the week.There is also some pressure and anxiety involved closer to comp.phase.This is nothing like extensive tempo or general strength in my opinion.
I think if you approach the short approach jumps this way this is very much the case. This is one of the reasons why I really tried to get Nick to stop measuring all his short approach jumps in practice. He does it less now and ultimately it’s not quite as big a stresor (for him) as I thought it might make it. I still wouldn’t recommend it for anyone else though.
In addition to increasing the anxiety (and thus intensity) of the short approach jumps, measuring them also makes it difficult for many athletes to focus on the technique rather than the mark. In the setup TK posted above, the short approach jumps are the primary technical development session and the short approaches are used with the understanding that skills can be learned more efficiently at sub-maximal speeds (although additional work will likely be needed to make a full transfer to full speed). When you measure the jumps, this is bad because when making technical adjustments it’s actually expected that there should be an initial performance decrement if a change is made. If your assessment of the effectiveness of a practice is the mark in the sand (short term focus) rather than skills learned to achieve those marks (long term focus) then it can create some conflicting issues.