Modelling 3D control of upright stance using an optimal control strategy.

Details

• Personal Author:
  Nussbaum MA ; Qu X
• Description:
  A 3D balance control model of quiet upright stance is presented, based on an optimal control strategy, and evaluated in terms of its ability to simulate postural sway in both the anterior-posterior and medial-lateral directions. The human body was represented as a two-segment inverted pendulum. Several assumptions were made to linearise body dynamics, for example, that there was no transverse rotation during upright stance. The neural controller was presumed to be an optimal controller that generates ankle control torque and hip control torque according to certain performance criteria. An optimisation procedure was used to determine the values of unspecified model parameters including random disturbance gains and sensory delay times. This model was used to simulate postural sway behaviours characterised by centre-of-pressure (COP)-based measures. Confidence intervals for all normalised COP-based measures contained unity, indicating no significant differences between any of the simulated COP-based measures and corresponding experimental references. In addition, mean normalised errors for the traditional measures were < 8%, and those for most statistical mechanics measures were approx. 3-66%. On the basis these results, the proposed 3D balance control model appears to have the ability to accurately simulate 3D postural sway behaviours. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Ergonomics Musculoskeletal System Occupational Health Safety
• Keywords:
  Author Keywords: Balance Control; 3D Model; Optimal Control Strategy; Centre-of-pressure; Postural Sway Ergonomics; Posture; Biomechanics; Models; Posture; Biomechanical Modeling; Simulation Methods;
• ISSN:
  1476-8259
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  15
• Issue:
  10
• NIOSHTIC Number:
  nn:20065332
• Citation:
  Comput Methods Biomech Biomed Eng 2012 Oct; 15(10):1053-1063
• Contact Point Address:
  Xingda Qu School of Mechanical and Aerospace Engineering, Nanyang Technological University, BLK N3, North Spine Nanyang Avenue, Singapore , 639798
• Email:
  xdqu@ntu.edu.sg
• Federal Fiscal Year:
  2013
• Performing Organization:
  Virginia Polytechnic Institute and State University
• Peer Reviewed:
  True
• Start Date:
  20030901
• Source Full Name:
  Computer Methods in Biomechanics and Biomedical Engineering
• End Date:
  20080831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:f7eeaedf3a8e5cc03fc3feb20f916ddc26919179829e4ed711a50a65b5947e1117c0c583f6ccfe6a8aff049ef3e7d05401ce5d813ee09f5c2ea0fa374ddd6df2
• Download URL:
  https://stacks.cdc.gov/view/cdc/249404/cdc_249404_DS1.pdf
• File Type:
  [PDF - 424.26 KB ]