Estimating Compressive and Shear Forces at L5-S1: Exploring the Effects of Load Weight, Asymmetry, and Height Using Optical and Inertial Motion Capture Systems

Details

• Personal Author:
  Chen H ; Gallagher S ; Nail-Ulloa I ; Schall MC Jr. ; Sesek R ; Zabala M
• Description:
  This study assesses the agreement of compressive and shear force estimates at the L5-S1 joint using inertial motion capture (IMC) within a musculoskeletal simulation model during manual lifting tasks, compared against a top-down optical motion capture (OMC)-based model. Thirty-six participants completed lifting and lowering tasks while wearing a modified Plug-in Gait marker set for the OMC and a full-body IMC set-up consisting of 17 sensors. The study focused on tasks with variable load weights, lifting heights, and trunk rotation angles. It was found that the IMC system consistently underestimated the compressive forces by an average of 34% (975.16 N) and the shear forces by 30% (291.77 N) compared with the OMC system. A critical observation was the discrepancy in joint angle measurements, particularly in trunk flexion, where the IMC-based model underestimated the angles by 10.92-11.19 degrees on average, with the extremes reaching up to 28 degrees. This underestimation was more pronounced in tasks involving greater flexion, notably impacting the force estimates. Additionally, this study highlights significant differences in the distance from the spine to the box during these tasks. On average, the IMC system showed an 8 cm shorter distance on the X axis and a 12-13 cm shorter distance on the Z axis during lifting and lowering, respectively, indicating a consistent underestimation of the segment length compared with the OMC system. These discrepancies in the joint angles and distances suggest potential limitations of the IMC system's sensor placement and model scaling. The load weight emerged as the most significant factor affecting force estimates, particularly at lower lifting heights, which involved more pronounced flexion movements. This study concludes that while the IMC system offers utility in ergonomic assessments, sensor placement and anthropometric modeling accuracy enhancements are imperative for more reliable force and kinematic estimations in occupational settings. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Humidity Mining Occupational Health Safety Temperature
• Keywords:
  Author Keywords: Motion Capture Biomechanical Modeling Biomechanics Ergonomics Lifting Biomechanics Manual Lifting Motion Studies Musculoskeletal Modeling Musculoskeletal System Sensors Wearables Wearable Technologies Xsens

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• ISSN:
  0746-9462
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Alabama ; OSHA Region 4
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  24
• Issue:
  6
• NIOSHTIC Number:
  nn:20069446
• Citation:
  Sensors 2024 Mar; 24(6):1941
• Contact Point Address:
  Howard Chen, Department of Industrial and Systems Engineering and Engineering Management, The University of Alabama at Huntsville, Huntsville, AL 35899
• Email:
  hc0060@uah.edu
• Federal Fiscal Year:
  2024
• Performing Organization:
  Auburn University at Auburn
• Peer Reviewed:
  True
• Start Date:
  20180901
• Source Full Name:
  Sensors
• End Date:
  20200831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:e6c36fa152d706b91ec254b2037a2ad901cbec472effe4fce17f355d6069b8abdd49fa47070e6c7cd4367223583a9dd984c735e67cc4cf1b2f722a95c0242435
• Download URL:
  https://stacks.cdc.gov/view/cdc/207896/cdc_207896_DS1.pdf
• File Type:
  [PDF - 10.47 MB ]