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Understanding the Role of Time-Delay on Maintaining Upright Stance on Rotational Balance Boards

[+] Author Affiliations
James R. Chagdes, Jeffrey M. Haddad, Shirley Rietdyk, Howard N. Zelaznik, Arvind Raman

Purdue University, West Lafayette, IN

Paper No. DETC2015-47857, pp. V006T10A009; 7 pages
  • ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 6: 11th International Conference on Multibody Systems, Nonlinear Dynamics, and Control
  • Boston, Massachusetts, USA, August 2–5, 2015
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5716-8
  • Copyright © 2015 by ASME


Mathematical models of human posture on a rigid surface predict two types of balance instabilities — a static tipping instability and a dynamic instability leading to large oscillations. Although a common technique to improve balance performance is placing patients on balance boards, little research has modeled bipedal posture on rotational boards to better understand the mechanisms underlying improvement. In this study we present a mathematical model of human stance on a single-degree-of-freedom balance board with controllable torsional stiffness and delayed feedback. Through a bifurcation analysis we find that the standard manipulation of decreasing board stiffness can lead to very different instabilities depending on an individual’s neuromuscular time-delay. This dependency limits the ability to use traditional boards for training and identification of balance deficits. We show that implementing a controllable time-delay may be more beneficial and allow for the customization of treatment plans for individual with very different characteristics.

Copyright © 2015 by ASME
Topics: Lumber , Delays



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