I have been doing some research into the arthrokinetic reflex. This directly relates to one of the foundational concepts behind the dynamic joint mobility of Z-Health.
A snippet of some of my rough, rough, rough draft paper:
Critical to performance, the sensorimotor system regulates the control and force applied by skeletal muscles to the bones and joints through the constant interplay of sensory and motor neurons. If at any time sensory feedback is altered abnormally, motor control of the muscles will be adjusted and altered as well. Hurley et al (27) stated that a joint must have normal mobility in order for the muscles which cross that joint to function efficiently. A muscle which crosses or attaches to an immobile joint will be inhibited by sensory feedback from free nerve endings located within joints and ligaments(mechanoreceptors) known as the arthrokinetic reflex (AKR). The AKR (6,21,23,45) is an inhibition of muscles surrounding or attaching to a joint that is injured, hypomobile, or exhibiting faulty arthrokinematics (43). The AKR may not only effect local muscles around a particular joint, but also more remote muscles, including those on the contralateral side of the body (22), which results from the multisegmental organization of mechanoreceptor afferents within the neuroaxis (21). The articular mechanoreceptors located within joint capsules regulate the AKR (5,8-11,43,44).
The importance of mobility cannot be overstated...
One more thing:
Stability should be taken out of the training world "vernacular". I am not sure what the hell this means anymore. This topic came up at the College Strength and Conditioning Coaches Association conference that I recently attended in Nashville, TN. (Gray Cook and Robb Rogers' presentation, which was good, but irritated my bad tooth when the overhead squat photos appeared again... ahhhhhh!!!!)
A big reward for anyone who can explain this one to me.