Exercise’s Effects on Horses’ Back Dimensions and Saddle Fit

Researchers determined that exercise causes horses’ back dimensions to change, which could negatively impact saddle fit.
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If you’re a runner, you’ve probably noticed that after a 45-minute jog your calf muscles seem a bit swollen or enlarged. They are responding to post-training fluid shifts, fiber hypertrophy (thickening), and the general strain of exercise. Horses’ muscles, particularly along the back, respond to exercise in the same way. Have you ever thought about what effect this might have on your saddle’s fit as your horse works?

Sue Dyson, MA, VetMB, PhD, DEO, FRCVS, and her colleagues at the Animal Health Trust, in Newmarket, U.K., did. They recently studied exercise-induced changes in horses’ back dimensions and presented their results at the 2014 American Association of Equine Practitioners Convention, held Dec. 6-10 in Salt Lake City, Utah.

Why are these subtle muscle changes even important? It all has to do with saddle fit, and if a saddle doesn’t fit properly, it can cause a horse pain and impair his performance.

"We know that the saddle needs to fit the horse in motion, but there has been no investigation of whether the thoracolumbar region (lower back, in front of the pelvis) changes in shape in association with exercise or how improper saddle fit may influence potential changes," Dyson began

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Alexandra Beckstett, a native of Houston, Texas, is a lifelong horse owner who has shown successfully on the national hunter/jumper circuit and dabbled in hunter breeding. After graduating from Duke University, she joined Blood-Horse Publications as assistant editor of its book division, Eclipse Press, before joining The Horse. She was the managing editor of The Horse for nearly 14 years and is now editorial director of EquiManagement and My New Horse, sister publications of The Horse.

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