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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
1Department of Informatics,
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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