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Parameters of forelimb ground reaction force in 48 normal ponies
A R Barr1, S M Dow, A E Goodship
1Division of Companion Animals, University of Bristol, Langford.
The Veterinary Record
|March 25, 1995
Summary
Pony weight influences how they trot. Heavier ponies have longer ground contact times, while faster trots correlate with higher vertical forces, impacting stride mechanics and symmetry.
Area of Science:
- Equine Biomechanics
- Locomotion Analysis
- Animal Physiology
Background:
- Understanding the biomechanics of equine locomotion is crucial for assessing athletic performance and identifying potential lameness issues.
- Ground reaction forces (GRFs) provide objective data on the interaction between the horse's limbs and the ground during movement.
- Previous research has established correlations between GRFs and various gait parameters, but specific relationships with bodyweight and speed require further elucidation.
Purpose of the Study:
- To investigate the relationships between pony bodyweight, vertical ground reaction forces (vGRFs), and temporal parameters of the stance phase during trotting.
- To determine how bodyweight affects total contact time and stride frequency.
- To analyze the timing of specific events within the stance phase and assess the symmetry of GRFs and temporal parameters.
Main Methods:
- Forelimb ground reaction forces were recorded from 48 healthy ponies trotting.
- Data analysis focused on correlations between bodyweight, vGRFs, stance phase timing, and total contact time.
- Symmetry of GRF and temporal parameters was evaluated.
Main Results:
- Significant positive correlations were found between pony bodyweight and mean vertical ground reaction forces.
- Bodyweight-corrected vGRFs showed an inverse correlation with total contact time, suggesting higher speeds are linked to greater forces.
- Pony bodyweight positively correlated with contact time, indicating reduced stride frequency in larger ponies.
- Mid and late stance phase events occurred at consistent fractions of total stance time.
- Ground reaction forces and time parameters exhibited high symmetry.
Conclusions:
- Pony bodyweight is a significant determinant of vertical ground reaction forces during trotting.
- Increased trotting speed, inferred from reduced contact time, is associated with higher vertical forces relative to bodyweight.
- Larger ponies exhibit longer contact times, suggesting a slower stride frequency.
- The timing of key stance phase events and the symmetry of GRFs are consistent across ponies.