A fellow trainer and I were having a discussion on this topic this morning. How much, if any, is central nervous system efficiency (ability to recruit motor units, etc.) increased by training in a destabilized environment? Some NASM resistance training protocols advocate the use of of unstable-to-stable supersets, with the idea that the CNS will recruit more muscle when challenged in this way.
I’m not referring to “balance” training or simply challenging the “core” musculature more, I’m talking about actually having a significant impact on the CNS’s ability to recruit more muscle fibers in the primary exercise, whatever that might be. For example–one thing I see trainers here doing is having their clients first lunge onto a stability disc, then supersetting that with squats (sadly, usually on a Smith machine).
Have there been any studies to support or validate this theory? If so, where could I find them? Any trainers/coaches out there have their clientele train like this? I suppose I would expect PL’ers to use techniques like this if it truly helped CNS efficiency.