Non-banked curved tracks influence movement symmetry in two-year-old Standardbred trotters.
Authors: Kallerud Anne S, Hernlund Elin, Byström Anna, Persson-Sjodin Emma, Rhodin Marie, Hendrickson Eli H S, Fjordbakk Cathrine T
Journal: Equine veterinary journal
Summary
# Editorial Summary: Non-banked curved tracks influence movement symmetry in two-year-old Standardbred trotters When young Standardbred trotters navigate the curves of training tracks, their movement patterns shift in measurable ways—specifically, the outside forelimb and hindlimb show reduced vertical motion asymmetry compared to straight sections, detected via wireless inertial measurement units during exercise warm-up in sixteen horses. Researchers found that on non-banked oval tracks with 80–85 m curve radii, horses exhibited a lower maximum head elevation following outside forelimb push-off (2.3 mm decrease) and altered pelvic motion during outer hindlimb stance (0.7 mm reduction), suggesting the curved geometry influences limb loading patterns even at modest trotting speeds. Although these differences were statistically significant, the effect sizes remained small and did not fully mirror the asymmetries previously documented in lunged circles, likely reflecting the gentler radius of the oval track compared to tighter circular work. For practitioners, the practical takeaway is reassuring: when evaluating movement symmetry using IMU systems at jogging speeds on standard training tracks, distinguishing between straight and curved sections is unlikely to meaningfully alter clinical assessment or training decisions. These findings suggest that subtle biomechanical adaptations to track geometry are normal within the range of typical training environments, though farriers and therapists should remain alert to asymmetries that exceed these expected variations.
Read the full abstract on PubMed
Practical Takeaways
- •Track curvature does influence movement symmetry in trotters, but the changes are subtle and clinically minor on standard-sized oval tracks at exercise speeds
- •When evaluating trotters with IMU systems for lameness or asymmetry, you do not need to separately analyze straight versus curved sections on typical training tracks—the differences won't meaningfully alter your clinical assessment
- •These findings suggest the non-banked curved geometry of standard racing ovals creates measurable but small biomechanical adjustments that horses accommodate naturally during training
Key Findings
- •During curved track segments, horses showed lower maximum vertical head position after outside forelimb push-off (2.3 mm decrease, P<0.0001) and higher minimum vertical head position during outside forelimb stance (1.8 mm increase, P<0.0001) compared to straight segments
- •Curved track segments produced decreased downward pelvic motion during outer hindlimb stance (0.7 mm decrease, P<0.0001), mimicking outside hindlimb impact asymmetry
- •Effect sizes were overall small and systematic differences between straight and curved segments did not fully correspond to previous lunge circle findings
- •On non-banked 1000 m tracks with 80-85 m curve radii, collecting IMU symmetry data at jogging speeds without distinguishing track segments is unlikely to affect clinical decision-making