Sensitivity and reliability of local dynamic stability: effects of age and altered sensory conditions

Details

• Personal Author:
  Kim S ; Nussbaum MA
• Description:
  Local dynamic stability was investigated during quiet upright stance with respect to age and altered sensory conditions. From center of pressure (COP) trajectories, the largest Lyapunov exponent (xmax) was extracted to directly parameterize local dynamic stability, and the reliability of xmax was assessed using the intra-class correlation coefficient (ICC). Thirty two participants volunteered for upright quiet stance trials. Vision and somatosenstaion were experimentally altered: vision was modified by eye closure, and somatosensation by using both a hard surface (HS) and a soft surface (SS). Age and vision had main effects on xma, and the age x vision and vision x surface interaction effects were also significant. In general, older participants were less stable (i.e., higher xmax) than younger, and altered sensory information resulted in a decrease in stability. Reliability was higher for older versus younger participants. Use of xmax enabled a direct assessment of age-related differences in local dynamic stability and effects of altered sensory conditions. Such non-linear measures can provide additional information to that available from traditional COP-based analyses. [Description provided by NIOSH]
• Subjects:
  Aging Men Musculoskeletal System Occupational Health Safety Sense Organs Women
• Keywords:
  Age-groups Humans Muscle-function Muscle-physiology Muscles Musculoskeletal-system Physical-capacity Physical-fitness Physiological-factors Physiological-function Physiological-response Physiology Posture Sensory-perceptual-processes

  More +
• ISBN:
  9788945289308
• ISSN:
  1071-1813
• Publisher:
  Human Factors and Ergonomics Society
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Proceedings
• Place as Subject:
  Maryland ; OSHA Region 3 ; Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  51
• Issue:
  15
• NIOSHTIC Number:
  nn:20040997
• Citation:
  Proceedings of the Human Factors and Ergonomics Society 51st Annual Meeting, October 1-5, 2007, Baltimore, Maryland. Santa Monica, CA: Human Factors and Ergonomics Society, 2007 Oct; 51(15):899-903
• Federal Fiscal Year:
  2008
• Performing Organization:
  Virginia Polytechnic Institute and State University
• Peer Reviewed:
  True
• Start Date:
  20000930
• Source Full Name:
  Proceedings of the Human Factors and Ergonomics Society 51st Annual Meeting, October 1-5, 2007, Baltimore, Maryland
• End Date:
  20040929
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:2c9798bd6207c79e2b6709d96aac2c2d77cf57ab3a07105b07b9dc08b505f986f1db20de70879a09b64127a3908091146547b6ec8a36e080beaab20b4987ab5e
• Download URL:
  https://stacks.cdc.gov/view/cdc/193675/cdc_193675_DS1.pdf
• File Type:
  [PDF - 156.02 KB ]