Association Between Stride Parameters and Racetrack Curvature for Thoroughbred Chuckwagon Horses.
Authors: van den Broek, Chan, De Bruyne, Garcia-Alamo, Skotarek Loch, Pfau
Journal: Sensors (Basel, Switzerland)
Summary
# Editorial Summary Racetrack geometry represents an underexplored variable in musculoskeletal injury risk for galloping horses, despite evidence that stride shortening precedes injury in racing populations. Van den Broek and colleagues equipped 28 Thoroughbred chuckwagon horses with GPS loggers during training to examine how track curvature influences stride mechanics, analysing speed, stride length and stride frequency across 100 m sections using mixed statistical modelling. On curved sections (60° curvature per 100 m), horses increased speed by 0.264 m/s but simultaneously reduced stride length by 2.1% (0.137 m) and increased stride frequency by 2.4% (0.053 Hz) at median racing speed—magnitude changes comparable to the stride shortening previously linked with injury onset. The interaction between speed and curvature proved significant, meaning stride adaptations to curves are speed-dependent and cannot be predicted from curvature alone. For practitioners, these findings suggest that training schedules, racing programmes and injury prevention strategies warrant consideration of cumulative biomechanical stress imposed by repeated curved-track work, particularly at higher velocities where stride compensations are most pronounced.
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Practical Takeaways
- •Racetrack curvature significantly alters stride biomechanics in a manner consistent with injury-risk profiles; monitor horses competing on curved tracks with heightened vigilance for injury warning signs
- •The combination of increased speed and reduced stride length on curves creates a biomechanical stress pattern similar to that observed before musculoskeletal injury; training programs should account for curve-specific fatigue and injury risk
- •Stride parameter monitoring via GNSS loggers could help identify injury-risk accumulation during training on varied track geometries and may inform safer track design or training schedules
Key Findings
- •Increased racetrack curvature (60° per 100 m) was associated with a 0.264 m/s increase in speed compared to straight sections, though confounded by fatigue
- •At median speed of 14.5 m/s and 60° curvature, stride frequency increased by 0.053 Hz (+2.4%) and stride length decreased by 0.137 m (-2.1%) compared to straight
- •The stride length reduction observed on curves (0.137 m) is comparable in magnitude to the 0.10 m reduction across consecutive races previously linked to increased injury risk
- •Curvature effects on stride parameters were speed-dependent, with significant interactions between speed and curvature for both stride length and frequency