An Informational Algorithm as the Basis for Perception-Action Control of the Instantaneous Axes of the Knee
|Wangdo Kim1, Margarida M. Espanha1, António P. Veloso1, Duarte Araújo1, Filipa João1, Luis Carrão1and Sean S. Kohles2*
|1Univ Tecn Lisboa, Fac Motricidade Humana, CIPER, LBMF, SPERTLAB, Estrada da Costa, P-1499-002 Lisbon, Portugal
|2Regenerative Bioengineering Laboratory, Departments of Mechanical and Materials Engineering and Biology, Portland State University, Portland, Oregon, USA
|Corresponding Author :
|Sean S. Kohles
Departments of Mechanical and Materials Engineering and Biology
Portland State University, Portland, USA
|Received February 28, 2013; Accepted March 25, 2013; Published March 27, 2013
|Citation: Kim W, Espanha MM, Veloso AP, Araújo D, João F, et al. (2013) An Informational Algorithm as the Basis for Perception-Action Control of the Instantaneous Axes of the Knee. J Nov Physiother 3:127. doi: 10.4172/2165-7025.1000127
|Copyright: © 2013 Kim W, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Traditional locomotion studies emphasize an optimization of the desired movement trajectories while ignoring sensory feedback. We propose an information based theory that locomotion is neither triggered nor commanded but controlled. The basis for this control is the information derived from perceiving oneself in the world. Control therefore lies in the human-environment system. In order to test this hypothesis, we derived a mathematical foundation characterizing the energy that is required to perform a rotational twist, with small amplitude, of the instantaneous axes of the knee (IAK). We have found that the joint’s perception of the ground reaction force may be replaced by the co-perception of muscle activation with appropriate intensities. This approach generated an accurate comparison with known joint forces and appears appropriate in so far as predicting the effect on the knee when it is free to twist about the IAK.