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Evaluation of spinal loading during lowering and lifting.
Kermit G Davis1, William S Marras, Thomas R Waters
1The Ohio State University, Biodynamics Laboratory, Columbus, OH, USA.
Clinical Biomechanics (Bristol, Avon)
|June 21, 2001
Summary
Spinal loads differ significantly between lifting and lowering tasks. Lowering tasks generate greater compression forces and require more strength, suggesting distinct biomechanical strategies influence spinal loading during these movements.
Area of Science:
- Biomechanics
- Occupational Health
- Spinal Loading
Background:
- Previous research focused on muscle activity and trunk strength during eccentric motions.
- A significant knowledge gap exists regarding three-dimensional spinal loading during lifting and lowering.
Purpose of the Study:
- To estimate three-dimensional spinal loads during various lifting and lowering tasks.
- To compare spinal loading characteristics between lifting and lowering activities.
Main Methods:
- Utilized in vivo measurements of trunk dynamics, moments, and myoelectric activity.
- Employed an electromyographic-assisted model to predict three-dimensional spinal loads.
- Ten subjects performed controlled lifting and lowering tasks with varying weights and velocities under pelvic and hip restraint.
Main Results:
- Lowering strength was 56% greater than lifting strength.
- Lowering tasks resulted in significantly higher compression forces and lower anterior-posterior shear forces compared to lifting.
- Differences in spinal loads were attributed to variations in muscle coactivity and lifting moments.
Conclusions:
- The nature of spinal loads during lowering and lifting tasks are significantly different.
- Distinct biomechanical strategies and lifting styles likely explain the observed differences in spinal loading.