Influence of the load of a rider or of a region with increased stiffness on the equine back: a modelling study.

The research investigates the impact of different load scenarios on a horse’s back, such as carrying a rider or experiencing increased muscle tension. It uses biomechanical simulations to gauge these influences and discover how they might contribute to common equine back issues.

Objectives and Methodology

• The primary objective of the research was to understand the effects of load on a horse’s back and how this could contribute to the development of equine back problems. This study particularly focused on the effects of a rider’s weight and increased muscle tone in the horse.
• To achieve these objectives, kinetic and kinematic data were gathered from 15 healthy horses. An electromyelograph of their long back muscles was also recorded to understand the muscular activity under different conditions.
• A biomechanical simulation model was then used to simulate different biomechanical scenarios. These scenarios involved variations of a horse being ridden and unridden, as well as having areas of localized increased stiffness in their back muscles.

Results

• The research found the vertical forces exerted by a rider on the horse’s back to be 3.83 N/kg at a walk, 5.18 N/kg trotting, and 5.60 N/kg galloping. However, there were no significant variations found in the transversal forces between ridden and unridden horses.
• When it came to the area with increased stiffness, significant changes were noted in the torques following it. During a walk, the lateral peak torques increased significantly, and similar increases were seen in trotting.

Conclusions

• In conclusion, the simulations showed that the stress of a rider on a horse’s back was less than that resulting from pathological processes such as an increment in the stiffness of the back.
• However, it was also noted that more accurate models, with a higher level of anatomical realism, might help in achieving more plausible results. This suggests that the study’s findings, while valuable, might benefit from further refinement and detailed investigation.