Effect of walking velocity on forelimb kinematics and kinetics.

The research sought to understand how different walking speeds affect the movement (kinematics) and forces (kinetics) on a horse’s forelimbs. This is to help establish a database of typical biomechanical indicators at varying speeds, against which lame horses can be compared.

Study Overview

The researchers observed five healthy horses walking across a force plate at various velocities, ranging from 0.82 to 1.91 m/s. The movements and forces in the forelimb were measured: kinematic data were documented in 51 trials.

Key Variables

• Stride Length: This measures the distance covered in one complete cycle of leg movements. As velocity increased, stride length similarly increased.
• Stride and Stance Duration: These variables indicate the time a horse takes to complete a stride and the period when the hoof is on the ground respectively. Both of these values decreased with higher walking velocities.
• Ground Reaction Force (GRF): GRFs entail vertical, braking, and propulsive impulses. These decreased as velocity grew, owing to the reduced stance duration, even though the peak GRFs increased.
• Net Joint Energies: The team found no notable increase in energy generation within any of the forelimb joints, suggesting that muscle activity didn’t drive the rising GRFs.

Key Findings

One significant discovery was that velocity-dependent increases in head and neck oscillation seemed to influence the changes in the GRFs. This understanding can improve comprehension of how the body as a whole contributes to force and energy production during locomotion.

Application and Conclusion

The results from the study were used to establish statistical equations. These can predict normal variables for any given walking velocity, supporting the diagnostics for lame horses and the detection of deviations from normal values. By understanding what is normal for horses at various speeds, veterinarians can more easily identify if lameness is impacting a horse’s gait or joint efforts.