The Effect of Training on Stride Duration in a Cohort of Two-Year-Old and Three-Year-Old Thoroughbred Racehorses.
Authors: Parkes Rebecca S V, Weller Renate, Pfau Thilo, Witte Thomas H
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Researchers tracked 40 two-year-old Thoroughbreds entering race training over 22 months using GPS-mounted inertial measurement units to establish how stride duration adapts during the critical developmental phase of training. A non-linear pattern emerged in younger horses, with stride duration initially shortening by 0.29 milliseconds per week before plateauing, whilst stride duration increased by 2.21 ms for every additional 100 m of galloping work—suggesting horses naturally lengthen their stride at higher speeds, yet paradoxically showed an independent 0.04 ms weekly reduction in stride duration per 100 m of weekly gallop distance accumulated. Three-year-olds demonstrated different adaptive patterns, with no overall change in stride duration during consistent training, though those with enforced time off showed shorter strides that took longer to normalise during resumed exercise. These findings reveal that stride duration changes reflect not just maturation and fitness adaptation but also individual responses to training load and recovery, providing farriers, veterinarians and trainers with objective baselines for distinguishing normal developmental gait changes from potential pathological alterations that warrant clinical investigation.
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Practical Takeaways
- •Trainers can use objective gait monitoring (GPS-IMU) to track normal training adaptations; stride duration changes are expected and indicate physiological adaptation rather than pathology
- •Young horses (2-year-olds) show rapid gait optimization early in training that plateaus over months—sudden deviations from expected pattern may warrant veterinary investigation
- •Horses returning from time off show different gait responses to exercise; allow extended re-conditioning periods and monitor for abnormal gait changes that may indicate musculoskeletal issues
Key Findings
- •Two-year-old horses showed non-linear decrease in stride duration over 22 months of training, with initial rapid decrease followed by plateau (p < 0.001)
- •Stride duration increased 2.21 ms per 100 m galloped in two-year-olds but decreased 0.04 ms per 100 m galloped per week with cumulative training (p < 0.001)
- •Three-year-old horses showed no overall change in stride duration over time, but those with time off showed decreased stride duration (-0.59 ms/week, p = 0.02)
- •Three-year-old horses with training breaks showed greater stride duration increase per distance galloped (1.05 ms additional per 100 m, p = 0.01) compared to continuous training