The Effect of Stance Width on Trunk Kinematics and Trunk Kinetics during Sagitally Symmetric Lifting

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2011-01-01
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Sorenson, Christopher
Haddad, Omid
Campbell, Samuel
Mirka, Gary
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Mirka, Gary
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Industrial and Manufacturing Systems Engineering
The Department of Industrial and Manufacturing Systems Engineering teaches the design, analysis, and improvement of the systems and processes in manufacturing, consulting, and service industries by application of the principles of engineering. The Department of General Engineering was formed in 1929. In 1956 its name changed to Department of Industrial Engineering. In 1989 its name changed to the Department of Industrial and Manufacturing Systems Engineering.
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Industrial and Manufacturing Systems Engineering
Abstract

Lifting technique can have a significant impact on spine loading during lifting. The sports biomechanics literature has documented changes in trunk and lower extremity kinematics and muscle coactivation patterns as a function of stance width during high force dead lift and squat exercises. The focus of the current study was to explore whether these lifting stance width effects might translate into the occupational setting under more moderate load level conditions. Twelve subjects performed repetitions of a sagittally symmetric lifting and lowering task (10 kg load) under three stance width conditions: narrow (feet together), moderate (feet shoulder width) and wide (feet 150% of shoulder width). As they performed these exertions, trunk kinematics were captured using the lumbar motion monitor while the activity of the trunk muscles (erector spinae, rectus abdominis) and lower extremity muscles (gluteus maximus, vastus lateralis and vastus medialis) were evaluated using normalized electromyography. The results showed that both the range of motion and peak acceleration in the sagittal plane were significantly affected by the stance width. The muscle activation levels, however, were not significantly affected by the stance width. These results collectively would indicate that the stance width effects seen in power lifting activities do not translate well into the occupational environment where more moderate loads are typically lifted.

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This is a manuscript of an article published as Sorensen, Christopher J., Omid Haddad, Samuel Campbell, and Gary A. Mirka. "The effect of stance width on trunk kinematics and trunk kinetics during sagitally symmetric lifting." International Journal of Industrial Ergonomics 41, no. 2 (2011): 147-152. doi:10.1016/j.ergon.2010.12.007. Posted with permission.

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Sat Jan 01 00:00:00 UTC 2011
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