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The Use of Negative Acceleration as Accessory Force during Lifting
Jordan Trafimow1, Alexander S Aruin1
1Department of Physical Therapy, University of Illinois at Chicago, Chicago, IL, USA.
Advances in Orthopedics
|January 12, 2019
Summary
Negative acceleration aids muscles during lifting, potentially reducing low back injuries in industrial settings. Optimizing this force can improve lifting techniques and decrease workplace injuries.
Area of Science:
- Biomechanics
- Occupational Health
- Ergonomics
Background:
- Industrial lifting injuries, particularly low back injuries, result in significant work loss and medical costs.
- Understanding lifting biomechanics is crucial for optimizing lifting techniques and injury prevention.
- The role of upward force generated by negative acceleration during lifting requires further investigation.
Purpose of the Study:
- To investigate the contribution of upward force from negative acceleration during lifting.
- To analyze how negative acceleration influences muscle engagement during various lifting loads.
Main Methods:
- Nine healthy subjects performed lifts with varying box loads (empty, 10, 20, 25 lb).
- Kinematic data, including accelerations and angular positions of the trunk and knee, were recorded.
- Analysis focused on periods of negative acceleration during the lifting motion.
Main Results:
- Negative acceleration provided assistance to quadriceps muscles at approximately 90° thigh flexion.
- It also aided hip muscles during the trunk rotation phase towards a standing position.
- Negative acceleration was observed across all tested load conditions.
Conclusions:
- The findings suggest that negative acceleration plays a supportive role in lifting.
- Enhancing the utilization of negative acceleration may be a viable strategy to improve lifting quality.
- This approach could potentially reduce the incidence of low back injuries in occupational settings.
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