Kinematic Analysis of Horse Gait

概要

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The kinematic data which based on stepping sequence, contact duration, airborne duration, step length, stride length and stride frequency were measured on 7 Thoroughbred racing horses for the purpose of clarifying characteristics of quadrupedal walking and running. Horses on walking and running at specified velocities were filmed using four 16mm high speed cameras. There were 6 velocities of running from 400m/min to 900m/min. The results were obtained as follows.1) All horses changed irregularly their stepping sequences with running velocity. The proportion of left lead to right lead was 6:1 at 396m/min, 5:2 at 527m/min, 2:5 at 593m/min, 5:2 at 713m/min, 2:5 at 831m/min and 3:4 at 950m/min.2) Contact duration decreased with velocity in all horses. No change could be detected in airborne duration.3) Both of airborne step length and mid step length, which was the distance from the fore trailing limb to the hind lead limb, increased with running velocity. As a result, the stride length increased.4) The stride length at the highest velocity increased as much as 183.5% of that at the lowest and the stride frequency at the highest velocity increased to 130.9%. It was evident that increase of the stride length contributed much to increasing running velocity more than the stride frequency.
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