Effect of dog breed and body conformation on vertical ground reaction forces, impulses, and stance times

Journal: Veterinary and Comparative Orthopaedics and Traumatology (VCOT)
ISSN: 0932-0814
DOI: http://dx.doi.org/10.3415/VCOT-10-06-0098
Issue: 2011: Issue 2 2011
Pages: 106-112

Effect of dog breed and body conformation on vertical ground reaction forces, impulses, and stance times

K. Voss (1), T. Wiestner (2), L. Galeandro (3), M. Hässig (4), P. M. Montavon (1)

(1) Clinic for Small Animal Surgery, Vetsuisse Faculty University of Zurich, Switzerland; (2) Equine Department, Section Sports Medicine, Vetsuisse Faculty University of Zurich, Switzerland; (3) Clinic for Small Animal Medicine, Vetsuisse Faculty University of Zurich, Switzerland; (4) Clinic for Farm Animals, Vetsuisse Faculty University of Zurich, Switzerland

Summary

Objectives: To assess whether fully normalised vertical ground reaction forces and stance times obtained at a trot depend on dog breed or body conformations. Methods: Peak vertical forces (PVF), vertical impulses (VI), stance times (ST), and ratio of forelimb impulse to total impulse (RVI) of 54 dogs of seven different breeds were normalised to body weight and body size according to the theory of dynamic similarity, and were tested for differences between breeds. Breeds were Borzoi, Bernese Mountain dog, Great Dane, Labrador Retriever, Landseer, Rhodesian Ridgeback, and Rottweiler. Body length ratio (BLR) and body mass index (BMI) were also compared between breeds. Results: Significant differences between breeds were found for the normalised forelimb PVF, VI and ST, and hindlimb PVF. Looking at individual breeds, it was most evident that Borzois had a lower forelimb VI, and a higher hindlimb PVF than the other breeds. This resulted in Borzois having a lower RVI compared to other dogs, indicating a more caudally located centre of gravity. Only a few differences in gait parameters were found between other dog breeds. The BMI was significantly lower in Borzois than in other breeds, but was otherwise not associated with gait parameters. Clinical significance: Force plate data of dogs of different breeds are not necessarily comparable, even after full normalisation to body weight and body size. Group comparisons should only be made when the groups consist of breeds with similar body conformations.

Keywords

Force plate, breed, data normalisation, body conformation, impulse distribution

DOI

http://dx.doi.org/10.3415/VCOT-10-06-0098

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