title: Postural coordination patterns as a function of dynamics of the support surface.
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.
authors.affiliation: Department of Human Movement Science, Seoul Women's University, 126, Kongnung 2-dong, Nowon-Ku, Seoul 139-774, South Korea.
authors.forename: Y G
authors.initials: YG
authors.lastname: Ko
authors.forename: J H
authors.initials: JH
authors.lastname: Challis
authors.forename: K M
authors.initials: KM
authors.lastname: Newell
mesh_terms: D000328:Adult; D000842:Ankle / Q000502:physiology*; D006615:Hip / Q000502:physiology*; D006801:Humans; D007717:Knee / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology*; D011187:Posture