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Accuracy of a system for measuring three-dimensional torso kinematics during manual materials handling.

Authors
Giorcelli-RJ; Hughes-RE; Current-RS; Myers-JR
Source
J Appl Biomech 2004 May; 20(2):185-194
NIOSHTIC No.
20025682
Abstract
This paper describes a procedure developed and validated to assess the accuracy of an infrared-based motion measurement system used to perform a kinematic analysis of the torso with respect to the pelvis during simulated lifting tasks. Two rigid reflective marker triads were designed and fabricated for attachment to the thorax over the 6th thoracic vertebra and the pelvis. System accuracy was assessed for planar rotation as well as rotations about multiple orthogonal axes. A test fixture was used to validate known triad orientations. The spatial coordinates of these triads were collected at 120 Hz using a ProReflex motion measurement system. Single value decomposition was used to estimate a rotation matrix describing the rigid body motion of the thorax triad relative to the sacral triad at each point in time. Euler angles corresponding to flexion, lateral bending, and twisting were computed from the rotation matrix. All measurement error residuals for flexion, lateral bending, and twisting were below 1.75 degrees. The estimated mean measurement errors were less than 1 degree in all three planes. These results suggest that the motion measurement system is reliable and accurate to within approximately 1.5 degrees for the angles examined.
Keywords
Materials-handling; Monitoring-systems; Motion-studies; Manual-lifting; Manual-materials-handling; Posture
Contact
Division of Safety Research, National Institute for Occupational Safety and Health, 1095 Willowdale Road, MS-G800, Morgantown, WV 26505
CODEN
JABOEG
Publication Date
20040501
Document Type
Journal Article
Fiscal Year
2004
NTIS Accession No.
NTIS Price
Issue of Publication
2
ISSN
1065-8483
NIOSH Division
DSR
Priority Area
Construction
Source Name
Journal of Applied Biomechanics
State
WV; MI
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