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Biomechanics of fall arrest using the upper extremity: age differences
Kyu-Jung Kim1, James A Ashton-Miller
1Department of Mechanical Engineering, University of Wisconsin--Milwaukee, 3200 N Cramer Street, 1239 EMS, Milwaukee, WI 53211, USA. kimk2@uwm.edu
Clinical Biomechanics (Bristol, Avon)
|April 12, 2003
Summary
Older adults experience higher impact forces and shorter braking times during simulated falls due to excessive upper extremity reflexive responses. Strategies increasing arm movement time can prevent fall-related injuries.
Area of Science:
- Biomechanics
- Gerontology
- Human movement analysis
Background:
- The upper extremity's role in shock absorption during falls is not fully understood.
- Falls are a significant cause of injury, particularly in older adults.
Purpose of the Study:
- To identify critical biomechanical factors in upper extremity fall arrests.
- To compare these factors between young and older adults.
Main Methods:
- A comparative study involving motion analysis of two age groups (young and older males).
- Participants performed self-initiated and cable-released simulated forward falls.
- Joint motion and impact forces at the hand were recorded.
Main Results:
- Significant age-related differences in joint kinematics and impact forces were observed.
- Older adults exhibited 10-15 times higher peak impact forces and 2-3 times shorter braking times in cable-released falls compared to self-initiated falls.
- Excessive reflexive responses in older adults contributed to these differences.
Conclusions:
- Pre-impact arm activity influences post-impact responses during fall arrests.
- Reducing excessive reflexive arm activation and increasing arm movement time can mitigate fall-related injuries.
- Fall prevention strategies enhancing arm movement time are crucial for older adults.