Disturbance and recovery of trunk mechanical and neuromuscular behaviours following prolonged trunk flexion: influences of duration and external load on creep-induced effects

Details

• Personal Author:
  Bazrgari B ; Hendershot B ; Madigan ML ; Muslim K ; Nussbaum MA ; Toosizadeh N
• Description:
  Trunk flexion results in adverse mechanical effects on the spine and is associated with a higher incidence of low back pain. To examine the effects of creep deformation on trunk behaviours, participants were exposed to full trunk flexion in several combinations of exposure duration and external load. Trunk mechanical and neuromuscular behaviours were obtained pre- and post-exposure and during recovery using sudden perturbations. Intrinsic trunk stiffness decreased with increasing flexion duration and in the presence of the external load. Recovery of intrinsic stiffness required more time than the exposure duration and was influenced by exposure duration. Reflexive trunk responses increased immediately following exposure but recovered quickly (approximately 2.5 min). Alterations in reflexive trunk behaviour following creep deformation exposures may not provide adequate compensation to allow for complete recovery of concurrent reductions in intrinsic stiffness, which may increase the risk of injury due to spinal instability. STATEMENT OF RELEVANCE: An increased risk of low back injury may result from flexion-induced disturbances to trunk behaviours. Such effects, however, appear to depend on the type of flexion exposure, and have implications for the design of work involving trunk flexion. [Description provided by NIOSH]
• Subjects:
  Behavior Men Musculoskeletal Diseases Nervous System Nervous System Diseases Occupational Health Risk Assessment Risk Factors Safety Women
• Keywords:
  Author Keywords: Low Back Pain Back-injuries Creep Deformation Exposure-levels Exposure-limits Humans Neuromuscular-system Neuromuscular-system-disorders Prolonged Flexion Reflex Risk-factors Spine Biomechanics Stiffness Weight-factors

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• ISSN:
  0014-0139
• 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:
  54
• Issue:
  11
• NIOSHTIC Number:
  nn:20040585
• Citation:
  Ergonomics 2011 Nov; 54(11):1043-1052
• Contact Point Address:
  Maury Nussbaum, Virginia Tech - Wake Forest School of Biomedical Engineering and Sciences, Virginia Tech, Blacksburg, VA 24061
• Email:
  nussbaum@vt.edu
• Federal Fiscal Year:
  2012
• Performing Organization:
  Virginia Polytechnic Institute and State University
• Peer Reviewed:
  True
• Start Date:
  20060801
• Source Full Name:
  Ergonomics
• End Date:
  20120731
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7e7e5d5d1278a8e2bb58e1809ebae1614bb44121abaf161d93f46f6e3bc3614e96428323767aa2bd77ff69a953bd1ccc18042621f4307205fb166af74667a15d
• Download URL:
  https://stacks.cdc.gov/view/cdc/193388/cdc_193388_DS1.pdf
• File Type:
  [PDF - 573.87 KB ]