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Measuring hoof slip of the leading limb on jump landing over two different equine arena surfaces

In: Comparative Exercise Physiology
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O. Orlande Sparsholt College, Westley Lane, Sparsholt, Winchester SO21 2NF, United Kingdom

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S.J. Hobbs School of Sport, Tourism and the Outdoors, University of Central Lancashire, Preston, Lancashire PR1 2HE, United Kingdom

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J.H. Martin Myerscough College, St Michaels Road, Bilsborrow, Preston, Lancashire PR3 0RY, United Kingdom

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A.G. Owen Myerscough College, St Michaels Road, Bilsborrow, Preston, Lancashire PR3 0RY, United Kingdom

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A.J. Northrop Department of Life Sciences, Anglia Ruskin University, East Road, Cambridge, CB1 1PT, United Kingdom

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The amount of hoof slip at the moment of impact can cause musculoskeletal injuries to the horse. Risk of injury is influenced by surface properties, however there is limited understanding of the effect on hoof slip during jump landing. The objectives of this study were to compare hoof slip on two different surfaces and investigate relationships between hoof slip and surface properties. A contact mat and hoof reference marker were designed and validated, the former to indicate the moment of impact and the latter to provide a visible reference marker on the lateral hoof wall. The leading right forelimb of six horses was recorded during jump landing on two different surfaces. Five trials, plus one where the forelimb landed on a contact mat were recorded at 500 Hz using a calibrated high speed camera positioned perpendicular to landing. Surface hardness, penetrability and traction were measured between horses. Horizontal displacement of the hoof reference marker was plotted and smoothed with a Butterworth filter at 25 Hz cut-off. Hoof slip was measured from impact to mid-stance. Data were analysed using ANOVA and Pearson correlations. A significant difference in hoof slip (10% wax = 4.9�2.1 cm and 3% wax = 7.4±3.6 cm) was found between the two surfaces (P<0.01). In addition, hoof slip was correlated with all surface measurements (hardness, penetrability and traction) on the 10% wax surface, but none on the 3% wax surface. Wax content appears to influence hoof slip during jump landing as greater hoof slip was measured on a 3% wax surface and variability on this surface was greater for the group. The results suggest that wax content had an effect on surface properties and greater variability in hardness and traction on the 3% wax surface influenced the consistency with which the horses jumped upon it.

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