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Maximum acceptable forces for repetitive ulnar deviation of the wrist
S H Snook1, D R Vaillancourt, V M Ciriello
1Liberty Mutual Research Center for Safety and Health, Hopkinton, MA 01748, USA.
American Industrial Hygiene Association Journal
|July 1, 1997
Summary
This study quantified maximum acceptable forces for wrist ulnar deviation at different repetition rates. Findings provide crucial data for preventing wrist injuries in repetitive tasks.
Area of Science:
- Ergonomics
- Occupational Health
- Biomechanics
Background:
- Repetitive wrist motions are common in various occupations.
- Understanding force limits is crucial for preventing musculoskeletal disorders.
- Previous research has focused on wrist flexion/extension, with less on ulnar deviation.
Purpose of the Study:
- To quantify maximum acceptable forces (MAFs) for wrist ulnar deviation.
- To investigate the impact of varying repetition rates on MAFs.
- To establish a basis for ergonomic guidelines for tasks involving ulnar wrist deviation.
Main Methods:
- A psychophysical methodology was employed, allowing subjects to adjust resistance.
- Subjects performed a 1.40 rad (80 degrees) ulnar deviation wrist motion with a power grip.
- Experiments involved two series with repetition rates of 15, 20, and 25 motions per minute over several weeks.
Main Results:
- Data on maximum acceptable forces for ulnar deviation at different repetition rates were collected.
- Subjective symptom data were recorded hourly.
- Results were compared with existing data for wrist flexion and extension forces.
Conclusions:
- Established quantitative data for maximum acceptable forces in wrist ulnar deviation.
- Highlights the influence of repetition rate on acceptable force levels.
- Provides valuable insights for designing safer work environments and preventing wrist injuries.