Disturbance and recovery of trunk mechanical and neuromuscular behaviours following repetitive lifting: influences of flexion angle and lift rate on creep-induced effects

Details

• Personal Author:
  Bazrgari B ; Hendershot B ; Madigan ML ; Muslim K ; Nussbaum MA ; Toosizadeh N
• Description:
  Repetitive lifting is associated with an increased risk of occupational low back disorders, yet potential adverse effects of such exposure on trunk mechanical and neuromuscular behaviours were not well described. Here, 12 participants, gender balanced, completed 40 min of repetitive lifting in all combinations of three flexion angles (33, 66, and 100% of each participant's full flexion angle) and two lift rates (2 and 4 lifts/min). Trunk behaviours were obtained pre- and post-exposure and during recovery using sudden perturbations. Intrinsic trunk stiffness and reflexive responses were compromised after lifting exposures, with larger decreases in stiffness and reflexive force caused by larger flexion angles, which also delayed reflexive responses.Consistent effects of lift rate were not found. Except for reflex delay no measures returned to preexposure values after 20 min of recovery. Simultaneous changes in both trunk stiffness and neuromuscular behaviours may impose an increased risk of trunk instability and low back injury. [Description provided by NIOSH]
• Subjects:
  Behavior Men Musculoskeletal Diseases Musculoskeletal System Nervous System Nervous System Diseases Occupational Health Risk Assessment Risk Factors Safety Women

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• Keywords:
  Author Keywords: Low Back Pain Back-injuries Biomechanics Exposure-levels Humans Injuries Lifting Musculoskeletal-system Musculoskeletal-system-disorders Neuromuscular-system Neuromuscular-system-disorders Reflex Repetitive-work Risk-factors Stiffness Trunk Flexion

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• ISSN:
  0014-0139
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Kentucky ; OSHA Region 3 ; OSHA Region 4 ; Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  56
• Issue:
  6
• NIOSHTIC Number:
  nn:20043632
• Citation:
  Ergonomics 2013 Jun; 56(6):954-963
• Email:
  nussbaum@vt.edu
• Federal Fiscal Year:
  2013
• 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-512:64b830214a7f70974e6d3dd01e72bb5546f543a32c9a1ad7d836d6b066ea623a4db81bfd4a42c8d2315986e957b2160598c9e0186e02d0fc15832510fa286ecb
• Download URL:
  https://stacks.cdc.gov/view/cdc/195477/cdc_195477_DS1.pdf
• File Type:
  [PDF - 265.80 KB ]