Shear cushions reduce the impact loading rate during walking and running.
Ming-Sheng Chan1, Shu-Ling Huang2, Yo Shih1
1Department of Athletic Performance, National Taiwan Normal University, Taipei, Taiwan.
Sports Biomechanics
|January 29, 2014
Summary
New shoe sole designs can reduce impact forces during running. Specific groove patterns, like straight or 45-degree designs, were found to decrease vertical loading and alter anterior-posterior forces, potentially preventing overuse running injuries.
Area of Science:
- Biomechanics
- Sports Medicine
- Running Injury Prevention
Background:
- Overuse running injuries are often linked to repetitive impact forces, including vertical and anterior-posterior ground reaction forces (GRF).
- The anterior-posterior GRF, particularly with a larger external moment arm, may be a significant contributor to these injuries.
- Novel footwear interventions are needed to mitigate these loading patterns.
Purpose of the Study:
- To investigate the effect of different shoe sole groove designs on vertical and anterior-posterior ground reaction forces during walking and running.
- To determine if a shear cushion device integrated with specific sole grooves can reduce impact loading.
- To analyze how sole groove geometry influences the timing and magnitude of peak GRF during various gait conditions.
Main Methods:
- Fifteen healthy male heel-striking runners participated.
- Participants walked (2.5 m/s), jogged (3.5 m/s), and ran (4.2 m/s) wearing shoes with conventional, straight groove, or 45-degree groove soles.
- Ground reaction forces (GRF) were measured to analyze vertical and anterior-posterior loading patterns and timing.
Main Results:
- Both straight and 45-degree groove soles induced significant shear shift across all tested gaits.
- These groove designs delayed the time to the first peak anterior-posterior GRF during walking.
- The straight groove sole significantly reduced the vertical loading rate during jogging and running and delayed the time to the first peak vertical GRF in all conditions.
Conclusions:
- Shoe sole groove design can effectively modify vertical loading rates and the timing of peak anterior-posterior GRF.
- Straight and 45-degree groove designs show potential for reducing repetitive impact forces associated with overuse running injuries.
- Future research should explore the clinical efficacy of these sole designs in injury prevention.
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