Tuesday, October 12, 2010

Biomechanics and Motor Control come together

This article reminded me of that old peanut butter cup commercial where the peanut butter truck and the chocolate truck run into each other and make a delicious treat.

Great article in this months Journal of Sport Science Research by Natalia Dounskaia, a kinesiologist from Arizona State U.

"Control of Human Limb Movements: The Leading Joint Hypothesis and Its Practical Applications".

Ever since I read Dr. Lederman's book and heard Frans Bosch speak and do in Florida this past June I realized I was behind the 8 ball a little.  They drove the point home that not all movement is driven by the proprioceptive system.  Rather it's the muscles communicating with each other; much of it independent of the CNS.

"The LJH is based on the idea that the CNS exploits the biomechanical properties of the limbs for movement organization.  One of the most influential biomechanical properties of human limbs is that they are linkages of several segments.  This multijoint structure causes motion-dependent mechanical interactions among the segments represented by passive ‘‘interaction’’ torque (INT) exerted at each joint. INT has a complex, highly nonlinear nature, making motions at all joints of the limb interdependent."

"An advantage of the LJH is that it makes organization of joint control during each movement transparent. Revealing the leading and subordinate joints clarifies both the control strategy applied to the entire limb and to each participating joint."

Funny...its getting simpler and more complex at the same time.  Stay tuned.

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