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Healthy young subjects were instructed to modify their weight-bearing asymmetry when standing on a double-seesaw device. The results indicated decreased and unchanged amplitudes in the center-of-pressure movements under the unloaded and loaded legs, respectively. In addition, a concomitant increased contribution of the more loaded leg and a decreased contribution of the pressure distribution mechanism along the mediolateral axis were observed in the production of the resultant center of pressure, its amplitude remaining constant. Thus, contrary to what was previously reported for stance control on solid ground, one of the main characteristics of a double-seesaw device, by preventing increased amplitudes on the loaded side during weight-bearing asymmetry, would be to facilitate a greater independency of the feet in the stance control process.
Rougier, Coquard, Ankaoua, Dury, and Barthod are with the Laboratoire Interdisciplinaires de Biologie de la Motricité, EA 7424, Université de Savoie, Le Bourget-du-Lac Cedex, France. Paillard is with the Laboratoire Mouvement, Equilibre, Performance et Santé, EA 4445, Université de Pau et des Pays de l’Adour, Tarbes, France. Perennou is with the Laboratoire de Psychologie et NeuroCognition, UMR5105, Université Grenoble-Alpes, BP47, Grenoble Cedex 9, France.