Originally Posted by LiquidFeet
Kind of depends on whether you can switch your base of support, or stabilize the other end of the joint in some way.
thats right LF. so when in skiing is there a reversal between the mobile bone of a joint and the more stable one, same joint, same bones, those are the parameters
Originally Posted by Jamt
Chad, related to this. In some of the articles I found when looking into this, it is stressed that for efficient movement it is important to relax the muscles not in use, i.e. to avoid co-contraction.
However, in some ski literature co-contraction is listed as key to efficient balance. What is your take on that?
Also, how does this relate to joint stabilization?
I would say Jamt it isn't so much about no co contraction the reality is that is not possible, the description to avoid it is based on reciprocal inhibition, the neurons that fire an agonist send input to decrease the opposing antagonist, the antagonist can still be firing, but the inhibition will allow for a more efficient use of the agonist.
I don't disagree with the ski literature, once you start downhill the balance system has to go into operation, there will be effort there and a co-contracted state is needed. having the ability to use the feedback allows you to measure the amount of the co contracted effort and adjust, so one is interfering with other minimally
Going back to the question I asked LF and to try to tie this together, poor regulation or sensation of the co contraction effort leads to hyper stability, the body can shuffle effort, so to maintain balance and still be able to move dynamically is the art, while they are 2 different systems they loop on each other, need more stability you need more parts available to move, need more parts to move, you need to feel how to balance to co-contracted effort around a joint or joints, flexstability
hope that answers the question Jamt.