Errors in using two dimensional methods for ergonomic assessment of motion in three dimensional space

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Wrist posture and rapid wrist movements are risk factors for work related musculoskeletal disorders. Measurement studies frequently involve optoelectronic methods in which markers are placed on the subject`s hand and wrist and the trajectories of the markers are tracked in three dimensional space. A goal of wrist posture measurements is to quantitatively establish wrist posture orientation. Accuracy and fidelity of the measurement data with respect to kinematic mechanisms are essential in wrist motion studies. Fidelity with the physical kinematic mechanism can be limited by the choice of kinematic modeling techniques and the representation of motion. Frequently, ergonomic studies involving wrist ... continued below

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4 p.

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Hollerbach, K.; Van Vorhis, R.L. & Hollister, A. March 1, 1996.

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Wrist posture and rapid wrist movements are risk factors for work related musculoskeletal disorders. Measurement studies frequently involve optoelectronic methods in which markers are placed on the subject`s hand and wrist and the trajectories of the markers are tracked in three dimensional space. A goal of wrist posture measurements is to quantitatively establish wrist posture orientation. Accuracy and fidelity of the measurement data with respect to kinematic mechanisms are essential in wrist motion studies. Fidelity with the physical kinematic mechanism can be limited by the choice of kinematic modeling techniques and the representation of motion. Frequently, ergonomic studies involving wrist kinematics make use of two dimensional measurement and analysis techniques. Two dimensional measurement of human joint motion involves the analysis of three dimensional displacements in an obersver selected measurement plane. Accurate marker placement and alignment of joint motion plane with the observer plane are difficult. In nature, joint axes can exist at any orientation and location relative to an arbitrarily chosen global reference frame. An arbitrary axis is any axis that is not coincident with a reference coordinate. We calculate the errors that result from measuring joint motion about an arbitrary axis using two dimensional methods.

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4 p.

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OSTI as DE96009236

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  • Risk assessment for musculo-skeletal disorders symposium, Copenhagen (Denmark), 13-14 Sep 1996

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  • Other: DE96009236
  • Report No.: UCRL-JC--123650
  • Report No.: CONF-9609116--1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 273758
  • Archival Resource Key: ark:/67531/metadc667959

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  • March 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 18, 2016, 3:25 p.m.

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Hollerbach, K.; Van Vorhis, R.L. & Hollister, A. Errors in using two dimensional methods for ergonomic assessment of motion in three dimensional space, article, March 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc667959/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.