Disturbance and recovery of trunk mechanical and neuromuscular behaviors following repeated static trunk flexion: influences of duration and duty cycle on creep-induced effects

Details

• Personal Author:
  Bazrgari B ; Hendershot B ; Madigan ML ; Muslim K ; Nussbaum MA ; Toosizadeh N
• Description:
  Occupations involving frequent trunk flexion are associated with a higher incidence of low back pain. To investigate the effects of repeated static flexion on trunk behaviors, 12 participants completed six combinations of three static flexion durations (1, 2, and 4 min), and two flexion duty cycles (33% and 50%). Trunk mechanical and neuromuscular behaviors were obtained pre- and post-exposure and during recovery using sudden perturbations. A longer duration of static flexion and a higher duty cycle increased the magnitude of decrements in intrinsic stiffness. Increasing duty cycle caused larger decreases in reflexive muscle responses, and females had substantially larger decreases in reflexive responses following exposure. Patterns of recovery for intrinsic trunk stiffness and reflexive responses were consistent across conditions and genders, and none of these measures returned to pre-exposure values after 20 min of recovery. Reflexive responses may not provide a compensatory mechanism to offset decreases in intrinsic trunk stiffness following repetitive static trunk flexion. A prolonged recovery duration may lead to trunk instability and a higher risk of low back injury. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Electrophysiology Ergonomics Men Musculoskeletal Diseases Musculoskeletal System Nervous System Occupational Health Safety Women
• Keywords:
  Author Keywords: Low Back Pain Back-injuries Biomechanics Body-mechanics Body-regions Creep Deformation Electrophysiological-effects Gender Humans Motion-studies Muscle-function Muscle-physiology Musculoskeletal-system-disorders Neuromuscular-function Neuromuscular-system Physiological-function Physiological-measurements Physiopathology Reflex Reflexes Repetitive-work Stiffness Trunk Flexion Work-intervals

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• ISSN:
  0003-6870
• 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:
  44
• Issue:
  4
• NIOSHTIC Number:
  nn:20043376
• Citation:
  Appl Ergon 2013 Jul; 44(4):643-651
• Contact Point Address:
  Maury A. Nussbaum, Department of Industrial and Systems Engineering, Virginia Tech, 250 Durham Hall (0118), Blacksburg, VA 24061, USA
• 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:
  Applied Ergonomics
• End Date:
  20120731
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:ad83338fa580a6d6746099e98ed34cb6077f514283c081543b9281571641e4452599b88a54139996712ed34887216d0e710f3bcea10cdeaeb71e5eadda24e5ab
• Download URL:
  https://stacks.cdc.gov/view/cdc/195293/cdc_195293_DS1.pdf
• File Type:
  [PDF - 428.76 KB ]