Abstract
The present study investigated the compensatory postural coordination patterns that emerge in the face of dynamic changes in the surface of support. Adult subjects stood on a moving platform that was sinusoidally translated in the anterior–posterior direction. The frequency and amplitude of the support surface translation were manipulated over a wide range of parameter values. The results revealed that as the frequency of platform motion increased, the postural system systematically exploited the available joint-space degrees of freedom and generated four distinct postural coordination modes ( a rigid mode → ankle mode → ankle–hip mode → ankle–hip–knee mode ). It appears that upright standing posture has a small set of coordination patterns that are particular to the dynamics of the surface of support.
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