Model-Based Assessments of the Effects of Age and Ankle Fatigue on the Control of Upright Posture in Humans

Details

• Personal Author:
  Madigan ML ; Nussbaum MA ; Qu X
• Description:
  The aim of this study was to investigate how and why age and localized muscle fatigue affect postural control using model-based simulations. A balance control model, based on an optimal control strategy, was used to simulate trials of quiet upright stance both pre-fatigue and following induced ankle plantarflexor fatigue. Empirical data were obtained from an earlier study that included both younger and older participants. Effects of age and ankle fatigue were determined from center-of-pressure (COP) measures and fitted model parameters. Though some discrepancies existed, the simulated effects of age and ankle fatigue were consistent with experimental findings in terms of trends in COP-based measures with age and ankle fatigue. Changes in both COP-based measures and model parameters were used to infer potential underlying causal mechanisms for the observed effects of age and ankle fatigue. For example, the model-based simulations indicated that sensory delay time increased with age and ankle fatigue by 31.1% and 2.9%, respectively, suggesting a potentially important role for such delay in postural control and fall risks. [Description provided by NIOSH]
• Subjects:
  Age Factors Aging Biomechanical Phenomena Ergonomics Fatigue Musculoskeletal Diseases Musculoskeletal System Occupational Health Safety
• Keywords:
  Age Age-factors Age-groups Ankle Fatigue Author Keywords: Balance Biomechanical-modeling Biomechanics Fatigue-properties Model-based Simulation Motion-studies Muscle-physiology Muscle-stress Muscles Musculoskeletal-system Musculoskeletal-system-disorders Physical-capacity Physical-reactions Physical-stress Physiology Postural Control Posture Statistical-analysis

  More +
• ISSN:
  0966-6362
• 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:
  30
• Issue:
  4
• NIOSHTIC Number:
  nn:20036322
• Citation:
  Gait Posture 2009 Nov; 30(4):518-522
• 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:
  2010
• Performing Organization:
  Virginia Polytechnic Institute and State University
• Peer Reviewed:
  True
• Start Date:
  20030901
• Source Full Name:
  Gait and Posture
• End Date:
  20080831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:f22c05ed78e1b152b1f9c530f6edda6ee2b30dec98513017cbb19aefd32fbdaace1f2f4c230de374e9e2422c3d0758a6b6e3f6dd9eff530e76e7138f798cb35c
• Download URL:
  https://stacks.cdc.gov/view/cdc/187794/cdc_187794_DS1.pdf
• File Type:
  [PDF - 181.97 KB ]