Soft tissue wobbling affects trunk dynamic response in sudden perturbations

Details

• Personal Author:
  Bazrgari B ; Madigan ML ; Nussbaum MA ; Shirazi-Adl A
• Description:
  Soft tissue wobbling reduces the transferred impact of external loads on lower limb joints. The present study investigated whether soft tissue wobbling has similar effects on trunk dynamic response to sudden perturbations. Three healthy males were subjected to a series of anteriorly directed trunk position perturbations at three different velocities while trunk kinematics and kinetics were measured. A nonlinear active-passive finite element model of the human trunk was then used to study the effects of soft tissue wobbling on trunk response. Also investigated were the effects on model predictions of including elements simulating the apparatus (rod-harness assembly) transferring motor-generated perturbations to the trunk. Predicted and measured trunk kinematics and kinetics, when accounting for the dynamic effects of both wobbling mass and rod-harness assembly, were in good agreement for all velocities especially early (less than 120 ms) after the perturbations (p greater than 0.97). Root mean square errors in model predictions increased considerably when neglecting the aforementioned modeling considerations. The trunk wobbling mass and connecting elements between the trunk and the perturbing device, particularly during faster perturbations, substantially attenuated the transferred impact of external loads on the spine (by 33-90 N across perturbation velocities). Such reductions in the impacts transferred, in turn, reduced the predicted demands on the neuromuscular system for control and maintenance of spinal loads and stability. As such, these features should be considered in future biodynamic models of the human trunk aimed at estimating trunk neuromuscular behaviors during sudden perturbations. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Men Musculoskeletal System Nervous System Occupational Health Safety
• Keywords:
  Anthropometry Author Keywords: Soft Tissue Wobbling Biodynamics Biokinetics Biomechanical-modeling Biomechanics Body-burden Body-mechanics Body-regions Finite Element Modeling Humans Kinetics Mathematical-models Measurement-equipment Neuromuscular-function Neuromuscular-system Physiological-response Physiological-stress Physiology Posture Simulation-methods Spinal-cord Spinal Loading Sudden Perturbation Tissue-distribution Weight-factors

  More +
• ISSN:
  0021-9290
• 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:
  44
• Issue:
  3
• NIOSHTIC Number:
  nn:20039067
• Citation:
  J Biomech 2011 Feb; 44(3):547-551
• Contact Point Address:
  M.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:
  2011
• Performing Organization:
  Virginia Polytechnic Institute and State University
• Peer Reviewed:
  True
• Start Date:
  20060801
• Source Full Name:
  Journal of Biomechanics
• End Date:
  20120731
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:a03b028d272bf79f96348df4f7d54c1be4b8b45c2fc0c7c9bb8c484752118baf097f6a02ce8c47e1180cdc510f889f000840218cfa874fc44a546fa48c325a20
• Download URL:
  https://stacks.cdc.gov/view/cdc/192555/cdc_192555_DS1.pdf
• File Type:
  [PDF - 746.80 KB ]