Body centre of mass movement in the sound horse.
Authors: Buchner H H, Obermüller S, Scheidl M
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary Understanding how a horse's body centre of mass (BCM) moves during locomotion is fundamental to interpreting force distribution across the limbs, yet direct measurement has been challenging until now. Buchner and colleagues used three-dimensional kinematic analysis on 12 sound horses, placing 30 reflective markers across 20 body segments to track movement at walk and trot on a treadmill; they then calculated the BCM position using established segmental inertial data. At the trot, the BCM exhibited remarkably efficient movement patterns—vertical oscillations of just 53 mm (27% less than trunk excursion), medio-lateral displacement of 19 mm (34% less), and sagittal oscillations of 13 mm (24% less)—with even greater damping observed at walk, where BCM movements were 43–65% smaller than external trunk movements depending on direction. These quantified baseline measurements for sound horses establish a reference against which lameness, rider effects, and performance variations can be objectively assessed, making this work invaluable for farriers evaluating weight-bearing patterns, veterinarians investigating gait abnormalities, and coaches analysing the biomechanical efficiency of different disciplines.
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Practical Takeaways
- •The BCM moves much less than the visible trunk during locomotion, indicating horses naturally stabilize their centre of mass for efficiency and load distribution
- •Understanding normal BCM movement patterns provides baseline reference for identifying abnormal gait patterns associated with lameness or training issues
- •Assessment of BCM movement could be used clinically to evaluate effects of therapeutic interventions, rider influence, and athletic performance in dressage horses
Key Findings
- •Body centre of mass (BCM) vertical displacement at trot was 53mm, 27% smaller than external trunk movement
- •BCM medio-lateral displacement at trot was 19mm, 34% less than trunk amplitude
- •BCM sagittal oscillations at trot were 13mm, 24% less than trunk movements
- •At walk, BCM movements were 43-65% smaller than corresponding trunk movements across all three planes