Dynamic properties of a dirt and a synthetic equine racetrack surface measured by a track-testing device.

The research article analyzes the dynamic properties of both dirt and synthetic surfaces for horse racetracks, identifying their impact on horse injuries. The objective was to understand the role of impact velocity, angle, and repeated impacts on these surfaces’ behavior by using a unique track-testing device embodying equine hoof impact.

Objective and Methodology

• The primary aim was to compare the dynamic responses of a dirt surface and a synthetic one, specifically in terms of how they respond to impacts that replicate a horse hoof’s strike onto the surface.
• A specially-designed track-testing device was used for this purpose. This device was capable of measuring force and displacement during an impact into both types of surfaces at differing rates of velocities, angles, and consecutive impacts.
• Measurement of surfaces was done in 3 distinct locations per day over a span of 3 days.
• An analysis of variance was employed to assess the effects of factors like surface type, impact velocity, impact angle, and the number of impacts on the dynamic properties of the surfaces.

Results

• The synthetic surface showcased less overall force, load rates, and stiffness when compared to the dirt surface. These values ranged from 37% to 67% of the values representing the dirt surface properties.
• Furthermore, surfaces were observed to be less stiff when impacted at lower velocities, angled impacts, and during initial impacts.
• The difference in characteristics between synthetic and dirt surfaces became more pronounced with repetitious impacts and at higher velocity impacts.

Conclusions and Implications

• In general, the synthetic surface proved softer than the dirt surface. This indicates that the hardness of the surfaces tends to increase significantly with repeat impacts, highlighting the need for regular maintenance.
• The study noted that differences between these surfaces would likely persist even at higher impact velocities, which are representative of high-speed training scenarios.
• Therefore, it is crucial to avoid exposing horses to precompacted or heavily used surfaces, especially during high-speed training where the ground may have been heavily trodden.
• The data derived from this study can aid in devising better racetrack surface management strategies, coordinating with equine training to prevent injuries to horses.