Validity of a sparse motion capture development platform for use in occupational biomechanics

Details

• Personal Author:
  Buczek FL ; Leonardis JM ; Selbie WS ; Sinsel EW ; Sommer HJ III
• Description:
  Introduction: Over-exertion during occupational activities such as lifting a load causes many musculoskeletal injuries to the low back and lower extremity. Industrial workplace configurations prevent practical motion capture systems from studying these injuries in settings where they occur. Current portable kinematic sensors include inertial measurement units (IMUs) and markerless motion capture (MMC), but each has certain limitations. Two-dimensional (2D) IMUs provide segment kinematics about the pitch and roll axes; 3D IMUs allow for the measurement of kinematics about the yaw axis, though these can be adversely affected by ferromagnetic objects [l). MMC requires anticipated segment kinematics [2). We hypothesized that MMC could return full 3D kinematics if provided appropriate date from 2D IMUs, and that combining these kinematics with plantar pressures would create a Portable Biomechanical Assessment Suite (PBAS). We developed a prototype PBAS that utilizes 2D IMUs, sparse motion capture, and pressure insoles to serve as a development platform for MMC algorithms. The purpose for this feasibility study was to test the validity of PBAS lumbar (L5/S I) and lower extremity biomechanics against values quantified using a traditional motion capture system (TMCS). METHODS: Five subjects (3 male, 2 female; mean age 27 yr, height 1.7 m, mass 66 kg) had six-degree-of-freedom data collected while they performed an occupational task involving lifting and lowering a load between the floor and a position level with the sternum. TMCS data were collected using a 14-camera motion capture system and two force plates. The PBAS used pelvis and heel marker trajectories, unilateral (left) segment kinematics collected via 2D IMU' s, plantar pressures, and a sensor fusion based upon probabilistic inference methods within Visual3D [3). Both methodologies calculated joint kinetics using inverse dynamics in Visual3D. RESULTS AND DISCUSSION: PBAS mean joint angles and moments were similar to those for the TMCS. Peak lumbar, hip, and knee joint angles differed by 7.5%, 4.9%, and 3.0% during lift initiation (approximately 0 % lift cycle) and 5.5%, 3.0%, and 4.6% during termination (approximately 100% lift cycle). Peak lumbar, hip, and knee joint moments differed by 5.4%, 14.4%, and 9.6% during lift initiation and 2.8%, 14%, and 0.9% during termination. CONCLUSIONS: Minimal differences between PBAS and TMCS suggest lower extremity biomechanics can be quantified using data limited to sparse motion capture, 2D segment kinematics, and plantar pressures. This development platform may lead to the viability of workplace MMC systems. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Men Musculoskeletal Diseases Musculoskeletal System Occupational Health Safety Women Workload Workplace
• Keywords:
  Analytical-processes Back-injuries Biomechanics Extremities Humans Measurement-equipment Musculoskeletal-system Musculoskeletal-system-disorders Physical-reactions Physical-stress Physiological-effects Physiological-factors Physiological-stress Physiology Work-capacity Work-environment Workers

  More +
• Publisher:
  American Society of Biomechanics
• Document Type:
  Text
• Genre:
  Abstract or Summary
• Place as Subject:
  Maryland ; OSHA Region 3 ; Pennsylvania ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  47
• NIOSHTIC Number:
  nn:20045685
• Citation:
  Proceedings of the Midwest American Society of Biomechanics (ASB) Regional Meeting, March 4-5, 2014, Akron, Ohio. Eugene, OR: American Society of Biomechanics, 2014 Mar; :47
• Email:
  JLeonardis@cdc.gov
• Federal Fiscal Year:
  2014
• NORA Priority Area:
  Construction ; Manufacturing
• Peer Reviewed:
  False
• Source Full Name:
  Proceedings of the Midwest American Society of Biomechanics (ASB) Regional Meeting, March 4-5, 2014
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7c813f3dc9de9d76b68d4b918f4b515f8b3d78574eda07b2dfbcf1e5198ab70393759accd14cdb470daa64eafc76d8a9553fa9d5f777cd23bbd51c9182413107
• Download URL:
  https://stacks.cdc.gov/view/cdc/201012/cdc_201012_DS1.pdf
• File Type:
  [PDF - 131.92 KB ]