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The effect of a repetitive, fatiguing lifting task on horizontal ground reaction forces.

Authors
Shu-Y; Southard-S; Shin-G; Mirka-GA
Source
J Appl Biomech 2005 Aug; 21(3):260-270
NIOSHTIC No.
20028995
Abstract
There are many outdoor work environments that involve the combination of repetitive, fatiguing lifting tasks and less-than-optimal footing (muddy/slippery ground surfaces). The focus of the current research was to evaluate the effects of lifting-induced fatigue of the low back extensors on lifting kinematics and ground reaction forces. Ten participants performed a repetitive lifting task over a period of 8 minutes. As they performed this task, the ground reaction forces and whole body kinematics were captured using a force platform and magnetic motion tracking system, respectively. Fatigue was verified in this experiment by documenting a decrease in the median frequency of the bilateral erector spinae muscles (pretest-posttest). Results indicate significant (p < 0.05) increases in the magnitude of the peak anterior/posterior (increased by an average of 18.3%) and peak lateral shear forces (increased by an average of 24.3%) with increasing time into the lifting bout. These results have implications for work environments such as agriculture and construction, where poor footing conditions and requirements for considerable manual materials handling may interact to create an occupational scenario with an exceptionally high risk of a slip and fall.
Keywords
Work-environment; Repetitive-work; Fatigue; Surface-properties; Manual-lifting; Manual-materials-handling; Injuries; Back-injuries; Agricultural-industry; Agricultural-workers; Construction-industry; Construction-workers
CODEN
JABOEG
Publication Date
20050801
Document Type
Journal Article
Funding Type
Cooperative Agreement
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U50-OH-007551
Issue of Publication
3
ISSN
1065-8483
Source Name
Journal of Applied Biomechanics
State
NC
Performing Organization
East Carolina University
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