Influence of Speed, Ground Surface and Shoeing Condition on Hoof Breakover Duration in Galloping Thoroughbred Racehorses.
Authors: Horan, Coburn, Kourdache, Day, Harborne, Brinkley, Carnall, Hammond, Peterson, Millard, Pfau
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Optimising shoeing and surface combinations for racehorses requires understanding how these factors influence hoof mechanics during gallop, particularly given the injury risks inherent to high-speed work. Researchers from the British Racing School used high-speed video analysis (1000 fps) to measure breakover duration across 14 horse-jockey pairs galloping at speeds between 23–56 km h⁻¹ on turf and artificial surfaces whilst shod with aluminium, steel, GluShu composite, or barefoot; breakover time was quantified by tracking the rotation of a marker on the lateral hoof wall through 90 degrees across 384 events per condition. As expected, breakover duration shortened significantly with increasing speed across all limbs (p < 0.0005), though hindlimbs showed disproportionately greater reduction beyond ~45 km h⁻¹, and turf consistently produced longer breakover times than artificial surfaces (p ≤ 0.04). Notably, shoeing condition only influenced breakover duration in the non-leading hindlimb, where specific shoe types altered the relationship between speed and breakover timing (p = 0.023), suggesting that hind limb biomechanics—which bear greater loading during acceleration—warrant closer scrutiny when evaluating shoeing interventions. These findings highlight that practitioners cannot treat speed, surface, and shoeing as independent variables; their interactions fundamentally shape hoof kinematics and may have implications for performance tuning and injury prevention strategies in racing.
Read the full abstract on PubMed
Practical Takeaways
- •Shoe selection should consider the primary racing surface and typical race speeds, as turf and artificial tracks produce different breakover mechanics that may influence performance and injury risk
- •Hindlimb shoeing decisions warrant particular attention given the significant interaction between shoe type and speed in these limbs, especially at racing speeds above 45 km/h
- •Breakover duration is a quantifiable kinematic parameter that can guide farrier decisions on shoe material and design for optimising gallop mechanics in racehorses
Key Findings
- •Breakover duration decreased significantly as gallop speed increased across all limbs (p < 0.0005), with proportionally greater reductions in hindlimbs beyond 45 km/h
- •Breakover duration was significantly longer on turf compared to artificial surfaces (p ≤ 0.04)
- •Shoeing condition affected breakover duration in non-leading hindlimbs only (p = 0.025), with a significant interaction between shoeing condition and speed (p = 0.023)
- •Aluminium, barefoot, GluShu composite, and steel shoes produced measurably different hoof kinematics during gallop depending on surface and speed