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First published online January 8, 2007
Journal of Experimental Biology 210, 187-197 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.02611
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Gait characterisation and classification in horses

Justine J. Robilliard1, Thilo Pfau1 and Alan M. Wilson1,2,*

1 Structure and Motion Laboratory, The Royal Veterinary College, North Mymms, Hatfield, Hertfordshire AL9 7TA, UK
2 Centre for Human Performance, University College London, Brockley Hill, Stanmore, Middlesex, HA7 4LP, UK


Figure 1
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  		Fig. 1. Stride variables: (A) left forelimb stance time, (B) left forelimb swing time, (C) left hindlimb-left forelimb stance time, (D) left hindlimb-left forelimb swing time, (E) left forelimb duty factor and (F) stride frequency against speed for each gait [red is walk (N=1755), blue is trot (N=2147), purple is tolt (N=2878), green is pace (N=662), yellow is left canter (N=267), black is left gallop (N=112), orange is right canter (N=871) and grey is right gallop (N=178)]. Total N=8870, 1-1021 strides per gait per speed category. Error bars represent ± 1 s.d.

 

Figure 2
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  		Fig. 2. Linear discriminant analysis results: (A) function 2 against function 1, (B) function 2 against function 3 and (C) function 1, function 2 and function 3 for walk (red circles, N=1414), tolt (purple circles, N=2279), trot (blue circles, N=1777), pace (green circles, N=262), left canter (yellow circles, N=597), left gallop (black circles, N=106), right canter (orange circles, N=542) and right gallop (grey circles, N=158).

 

Figure 3
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  		Fig. 3. The symmetrical gait plot of Hildebrand (Hildebrand, 1989Go) overlaid with the walk (red circles), tolt (purple circles), trot (blue circles) and pace (green circles) data from this study. The findings of this study do not perfectly match those of Hildebrand.

 

Figure 4
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  		Fig. 4. Linear discriminant analysis results, including unclassified strides: (A) function 2 against function 1, (B) function 2 against function 3 for walk (red circles, N=1414), tolt (purple circles, N=2279), trot (blue circles, N=1777), pace (green circles, N=262), left canter (yellow circles, N=597), left gallop (black circles, N=106), right canter (orange circles, N=542), right gallop (grey circles, N=158) and all unclassified strides (light blue circles, N=806).

 




© The Company of Biologists Ltd 2007