The concept of metastability for one-legged standing

POSTER

Abstract

Standing on one foot has been characterized by a continuum between static equilibrium (standing) and dynamic equilibrium (walking). This suggests that sways of the body are important for a person to maintain the upright position and prevent a fall. We examine the center of pressure (COP) changes with visual input, and find that the character of COP dynamics is different on different time scales: it is random (stochastic) on short time scales $0 < t < 20\, \mbox{ms}$, ballistic (deterministic) on intermediate time scales $20\, \mbox{ms} < t < \mbox{200 ms}$, and random on long time scales $200 \, \mbox{ms} < t < 25 \, \mbox{s}$.

Authors

  • Ulrich Zurcher

    Physics Dep, Cleveland State University

  • Mikhail Zamkov

    University of Notre Dame, University of Toledo, Case Western Reserve University, John Carroll University, Bowling Green State Univ, Materials Science and Technology Division, Oak Ridge National Laboratory, Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Ohio University, Shanghai Jiao Tong University, Department of Chemistry and Biochemistry, University of Toledo, Department of Chemical Engineering, University of Toledo, Wuhan University, Southeast University, Physics and Astronomy and Center for Photochemical Science, Bowling Green State University, Physics and Astronomy, University of Toledo, Air Force Research Laboratory, Physics and Astronomy, Bowling Green State University, Purdue University, Student/Supervisor, Student, None, University of Michigan, Dearborn, Clemson University, Michigan State University, Bowling Green State University, Physics Dep, Cleveland State University, Physical Therapy Program, Central Michigan State University

  • Mikhail Zamkov

    University of Notre Dame, University of Toledo, Case Western Reserve University, John Carroll University, Bowling Green State Univ, Materials Science and Technology Division, Oak Ridge National Laboratory, Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Ohio University, Shanghai Jiao Tong University, Department of Chemistry and Biochemistry, University of Toledo, Department of Chemical Engineering, University of Toledo, Wuhan University, Southeast University, Physics and Astronomy and Center for Photochemical Science, Bowling Green State University, Physics and Astronomy, University of Toledo, Air Force Research Laboratory, Physics and Astronomy, Bowling Green State University, Purdue University, Student/Supervisor, Student, None, University of Michigan, Dearborn, Clemson University, Michigan State University, Bowling Green State University, Physics Dep, Cleveland State University, Physical Therapy Program, Central Michigan State University