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Dynamic push-pull characteristics at three hand-reach envelopes: applications for the workplace.
Maya Calé-Benzoor1, Ruth Dickstein2, Michal Arnon3
1Physical Therapy Department, Faculty of Social Welfare and Health Sciences, University of Haifa, Israel; The Ribstein Center for Sports Medicine and Research, Wingate Institute, Netanya, Israel.
Applied Ergonomics
|September 12, 2015
Summary
Work capacity during seated pushing and pulling tasks varies by reach envelope. Pushing is optimal at medium reach, while pulling is best at maximum reach, informing safer workstation design.
Area of Science:
- Ergonomics
- Biomechanics
- Occupational Health
Background:
- Manual pushing and pulling are frequent workplace activities.
- Overexertion injuries are common in these tasks.
- Understanding work capacity is crucial for safe workstation design.
Purpose of the Study:
- To describe workloads during seated push-pull tasks across different reach envelopes.
- To compare work capacity in various reach conditions for pushing and pulling.
Main Methods:
- Forty-five women performed isokinetic push-pull sequences at two velocities.
- Strength, work, and muscle ratios were calculated across the full range of motion (ROM).
- ROM was divided into neutral, medium, and maximum reach envelopes for analysis.
Main Results:
- Push capability was highest in the medium reach envelope.
- Pulling capability was greatest in the maximum reach envelope.
- The push/pull strength ratio was approximately 1.
Conclusions:
- Work capacity for seated push-pull tasks is dependent on reach envelope.
- Avoid strenuous push-pull exertions in neutral reach envelopes.
- Findings can guide ergonomic improvements for workstation design.
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