Can muscle stiffness alone stabilize upright standing?

Pietro G. Morasso, Marco Schieppati

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)1622-1626
Number of pages5
JournalJournal of Neurophysiology
Issue number3
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Physiology
  • Neuroscience(all)


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