Impact and shear resistance of turf grass racing surfaces for Thoroughbreds.

This research article delves into the effects of turf grass surfaces on horses during races, specifically examining how different soil characteristics influence the impact and sheer resistance of a horse’s hoof to the racing surface.

Objective

The paper aims to measure the impact resistance and shear resistance of different horse racing surfaces under various conditions. These two factors are significant since they mirror the interaction between the horse’s hoof and the racing surface, observed as the shock experienced by the horse’s leg upon impact (impact resistance) and the rotation of the horse’s hoof into the racing surface (shear resistance).

Research methods

The research methods for this study would revolve around physical measurements of the racing surfaces under diverse conditions. Elements like soil type, turf factors, moisture levels, and management practices were considered to influence the impact and shear resistance.

• Impact resistance was defined as the peak deceleration of a moving entity when it hits the test surface, simulating the shock experienced by a horse’s leg when it lands on the racing track.
• Shear resistance was an assessment of the surface’s resistance to the rotation of the horse’s hoof entering the racing surface.

Findings

The investigation revealed several noteworthy points, including:

• Thatch accumulation (layers of dead grass) and mowing height on the turf didn’t significantly affect the hardness of the racing surface, indicating that turf management should aim to optimize growth and recovery of the turf.
• The roots of the turf contributed to increased impact and shear resistance, implying their critical role in providing a stable surface for the horse.
• Soil moisture, which can be controlled via irrigation and drainage, allowed adjustments of racing surface hardness – essential for horse safety and performance.
• Soil materials were found to provide lower impact resistance (lower shock to horse’s leg) and higher resistance to shear (greater resistance to hoof rotation) compared to sand materials, suggesting their better suitability for horse racing tracks.

In conclusion, this research’s findings contribute valuable insights into designing safer and more efficient horse racing surfaces.