The Effect of a Variable Lumbar Erector Spinae Sagital Plane Moment Arm on Predicted Spinal Loading

Details

• Personal Author:
  Jorgensen, Michael J. ; Marras WS ; Waters, Thomas R.
• Description:
  Recent research indicates that the sagittal plane moment arm of the erector spinae decreases at the LS/SI level during torso flexion. The objective of this study was to assess the predicted L5/S1 spinal loading from a lifting task when allowing the erector spinae sagittal plane moment arm to vary during torso flexion. Nineteen male subjects lifted three loads from two origin locations to an upright neutral posture. Spinal loading was predicted from an EMG-assisted biomechanical model that allowed the erector spinae moment arm to vary during torso flexion. The predicted lateral, anterior-posterior shear and compression forces increased by 7.4%, 11.1 % and 6.6%, respectively, when compared to using a biomechanical model that kept the erector spinae moment arm constant. These results suggest that models that account for the varying erector spinae moment arm predict greater spinal loads, especially for motions that involve a large degree of torso flexion. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Ergonomics Manufacturing And Industrial Facilities Musculoskeletal Diseases Musculoskeletal System Nervous System Occupational Health Safety
• Keywords:
  Biomechanical-modeling Humans Manual-lifting Manual-materials-handling Materials-handling Musculoskeletal-system-disorders Posture Spinal-cord
• ISBN:
  9780945289203
• ISSN:
  1071-1813
• Publisher:
  Human Factors and Ergonomics Society
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Kansas ; Maryland ; Ohio ; OSHA Region 3 ; OSHA Region 5 ; OSHA Region 7
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  46
• Issue:
  13
• NIOSHTIC Number:
  nn:20023282
• Citation:
  Proceedings of the Human Factors and Ergonomics Society 46th Annual Meeting, September 29 - October 4, 2002, Baltimore, Maryland, Bringing Fundamentals & New Opportunities. Santa Monica, CA: Human Factors and Ergonomics Society, 2002 Sep; 46(13):1061-1065
• Federal Fiscal Year:
  2002
• Peer Reviewed:
  True
• Source Full Name:
  Proceedings of the Human Factors and Ergonomics Society 46th Annual Meeting, September 29 - October 4, 2002, Baltimore, Maryland, Bringing Fundamentals & New Opportunities
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:c4d2dbac867e9598128cc90a98ea54f7289216c907ddfa3763c6e38c99e5508f623a6ef344a59a88d29de97586459246b6c3f1b05313cb1ee75495331932a9b5
• Download URL:
  https://stacks.cdc.gov/view/cdc/195803/cdc_195803_DS1.pdf
• File Type:
  [PDF - 520.13 KB ]