Quantitative assessment of gait alterations and variability in sulky-driven Standardbred trotters after a standardised exercise test.
Authors: Aarts Rhana Mackie, Smit Ineke Hillie, Ferraz Guilherme de Camargo, Rhodin Marie, Serra Braganca Filipe Manuel, Hernlund Elin
Journal: Equine veterinary journal
Summary
# Editorial Summary Standardbred trotters alter their movement patterns significantly during and after exercise, according to new kinematic analysis using inertial measurement units (IMUs) fitted to thirteen horses performing a standardised incremental exercise test. Researchers captured locomotory data at the start and end of the protocol, measuring upper-body and limb angles alongside stride-to-stride consistency, whilst recording heart rate and blood lactate to quantify internal workload. The exercise induced several notable adaptations: head and withers motion decreased (by 12.3 mm and 8.5 mm respectively), front limb swing range increased by 16.1 degrees through greater protraction and retraction angles, and—perhaps most importantly—stride-to-stride variability reduced across multiple parameters including stride duration and front limb mechanics, suggesting fatigue-driven motor patterning rather than instability. No changes occurred in hindlimb mechanics or limb asymmetry, indicating the front end bears primary compensatory responsibility. For practitioners, these findings demonstrate that IMUs offer practical, non-invasive detection of exercise response and fatigue signatures in performance horses, potentially supporting earlier identification of training stress or maladaptation before overt lameness develops—though the mixed training statuses and ages of the cohort mean results should be contextualised against individual conditioning levels.
Read the full abstract on PubMed
Practical Takeaways
- •IMU technology provides objective, non-invasive monitoring of training effects on gait; consider adopting for objective performance assessment and early detection of maladaptation in working trotters
- •Post-exercise gait changes are normal and measurable—reduced stride variability and altered limb kinematics indicate metabolic and locomotory adaptation to exercise
- •These baseline findings for Standardbred trotters can inform training protocols and help establish normative exercise responses for individual fitness monitoring
Key Findings
- •Head and withers range of motion decreased by 12.3 mm and 8.5 mm respectively after standardised exercise test (p<0.05)
- •Front limb sagittal range of motion increased by 16.1° with increased maximal protraction (6.9°) and retraction (9.1°) after exercise (p≤0.002)
- •Stride-to-stride variability reduced for stride duration (-0.7%), front limb sagittal ROM (-7.3%), maximal protraction (-6.9%) and maximal retraction (-7.4%) after exercise (p<0.05)
- •Inertial measurement units successfully detected exercise-induced kinematic changes non-invasively in Standardbred trotters