title: Postural Preparation to Stepping: Coupled Center of Pressure Shifts in the Anterior-Posterior and Medio-Lateral Directions.
abstract: We explored changes in the postural preparation to stepping introduced by modifications of the initial coordinates of the center of pressure (COP). We hypothesized that the postural adjustments in the anterior-posterior direction would persist across all initial COP manipulations while the adjustments in the medio-lateral direction would be highly sensitive to the initial COP coordinate. Healthy subjects stood on a force plate, shifted the body weight to one of the initial conditions that spanned the range of COP coordinates in both directions, and initiated a single step or started to walk. No major changes were observed between the stepping and walking conditions. Changes in the initial COP coordinate in the medio-lateral direction led to scaling of the magnitude of the COP shift in that direction prior to stepping accompanied by a nearly proportional change in the COP shift in the anterior-posterior direction. Changes in the initial COP coordinate in the anterior-posterior direction led to scaling of the magnitude of the COP shift in that direction prior to stepping without consistent changes in the COP shift in the medio-lateral direction. We interpret the results as reflecting a neural organization using a small set of referent body configurations for the postural adjustments.
authors.affiliation: Aspetar Orthopaedic and Sports Medicine Hospital, Research Department, Doha, Qatar.
authors.forename: Clint
authors.initials: C
authors.lastname: Hansen
authors.affiliation: Univ Paris-Sud. UR CIAMS, EA 4532 - Motor Control & Perception team, Orsay; UFR STAPS, Université d'Orléans, France.
authors.forename: Jacques
authors.initials: J
authors.lastname: LaRue
authors.affiliation: Univ Paris-Sud. UR CIAMS, EA 4532 - Motor Control & Perception team, Orsay.
authors.forename: Manh-Cuong
authors.initials: MC
authors.lastname: Do
authors.affiliation: The Pennsylvania State University, University Park, PA, USA.
authors.forename: Mark L
authors.initials: ML
authors.lastname: Latash
keywords: biomechanics; center of pressure; posture; referent configuration; stepping