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Perception of impact is affected by stimulus intensity
Ana Paula Silva Azevedo1, Katia Brandina1, Juliana Pennone1
1Laboratory of Biomechanics, School of Physical Education and Sport, University of São Paulo , São Paulo, Brazil.
Sports Biomechanics
|January 30, 2019
Summary
Understanding the impact of external loads during movement is key. This study found that perceived impact intensity correlates well with actual forces measured during drop jumps, suggesting perception can monitor real loads.
Area of Science:
- Biomechanics
- Motor Control
- Sports Science
Background:
- Perception of external loads is crucial for movement adjustments.
- The relationship between perceived and actual mechanical load is debated.
- Understanding this link can inform injury prevention strategies.
Purpose of the Study:
- To correlate vertical ground reaction force (vGRF) with perceived impact during drop jumps.
- To investigate how different stimulus intensities affect impact perception.
- To explore the utility of perceived impact as a proxy for real impact forces.
Main Methods:
- Ten physically active men performed drop jumps from varying heights (0.20-0.80 m).
- Vertical ground reaction force (vGRF) was measured using a force plate.
- Perception of impact was assessed using Borg's Ratings of Perceived Exertion.
Main Results:
- Increased jump height led to higher vGRF (Fy_max, I_50) and shorter time to peak force.
- Perceived impact perception increased with jump height, correlating with I_50.
- Fy_max and I_50 showed moderate to strong correlations with perceived load (70% and 90% of participants).
Conclusions:
- Higher stimulus intensity enhances impact perception, correlating with kinetic parameters.
- Perceived impact can serve as a reliable surrogate for monitoring 'real' external loads.
- This perception-based monitoring may aid in managing impact-related injury risk.
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