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J Neurophysiol 82: 1622-1626, 1999;
0022-3077/99 $5.00
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The Journal of Neurophysiology Vol. 82 No. 3 September 1999, pp. 1622-1626
Copyright ©1999 by the American Physiological Society

RAPID COMMUNICATION

Can Muscle Stiffness Alone Stabilize Upright Standing?

Pietro G. Morasso1 and Marco Schieppati2

 1Department of Informatics, Systems, Telecommunication and  2Department of Experimental Medicine, University of Genova, I-16145 Genova, Italy

Morasso, Pietro G. and Marco Schieppati. Can Muscle Stiffness Alone Stabilize Upright Standing?. J. Neurophysiol. 82: 1622-1626, 1999. A stiffness control model for the stabilization of sway has been proposed recently. This paper discusses two inadequacies of the model: modeling and empiric consistency. First, we show that the in-phase relation between the trajectories of the center of pressure and the center of mass is determined by physics, not by control patterns. Second, we show that physiological values of stiffness of the ankle muscles are insufficient to stabilize the body "inverted pendulum." The evidence of active mechanisms of sway stabilization is reviewed, pointing out the potentially crucial role of foot skin and muscle receptors.




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