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An investigation of the variability in human performance during manual material handling activities.

Authors
Mirka-GA; Baker-A
Source
Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting, October 24-28, 1994, Nashville, Tennessee. Santa Monica, CA: Human Factors and Ergonomics Society, 1994 Nov; 38(Ind Erg):578-582
NIOSHTIC No.
00227966
Abstract
The variability of kinetic parameters describing human performance of manual material handling activities was investigated, as well as the effects of different variables on the magnitude of this variability. The motion of the lumbar trunk of seven male college students performing lifting tasks under various conditions was monitored using the Lumbar Motion Monitor. A biomechanical model was used to calculate instantaneous dynamic external torque about the lumbosacral joint. Significant variability in the magnitude of the peak velocity and acceleration in the sagittal plane was seen, along with significant amounts of motion in the coronal and transverse planes. Examination of the trunk motion data using the biomechanical model indicated a significant effect due to the load weight with greater weight levels having higher levels of variability. Poor coupling at near maximal load levels generated the greatest variability in the sagittal plane, but not in the transverse or coronal planes. The authors conclude that consideration of only average performance profiles underestimates peak torque by between 5% and 15% and underscores the need for stochastic modeling of biomechanical systems.
Keywords
NIOSH-Grant; Musculoskeletal-system-disorders; Manual-lifting; Manual-materials-handling; Biomechanics; Biophysics
Contact
Industrial Engineering North Carolina State Universit Box 7906 Raleigh, NC 27695
CODEN
PHFSDQ
Publication Date
19940101
Document Type
Conference/Symposia Proceedings
Funding Amount
158477
Funding Type
Grant
Fiscal Year
1994
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-K01-OH-00135
Issue of Publication
Ind Erg
ISSN
1071-1813
Source Name
Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting, October 24-28, 1994, Nashville, Tennessee, People & Technology in Harmony
State
CA; TN; NC
Performing Organization
North Carolina State University Raleigh, Raleigh, North Carolina
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