It can sometimes be difficult to detect lameness with the naked eye, simply by watching how a horse moves. A variety of sensors able to quantify gait asymmetries using algorithms are now commercially available, but it hasn't been clear whether the individual who applies the sensors can affect the results.
To verify that sensors give similar measurements no matter who uses them, scientists at the Alfort National Veterinary School in France created a study to assess the sensors' repeatability. The study used three horses and four operators: two who had placed sensors before and two who had not. The system used for the study had seven wireless measurement units fitted on the head, withers, pelvis and each cannon bone.
The sensors were set 48 times; each operator set the sensors four times on each horse. Once the sensors were set, each horse completed the same exercise test. The test measured 42 asymmetry indexes: 14 in straight lines, 14 in left-hand circles and 14 in right-hand circles.
The scientists calculated total variance and standard deviation; they also sought to determine how much of the variance was attributable to the operator. They found that operators were responsible for less than 1 percent of the total variance in 81 percent of the cases. The sensor placed on the head had the highest standard deviation and the sensor on the withers showed the lowest standard deviation.
The scientists noted that the variance on the head sensor was most likely related to how tightly the operator held the horse's head; multiple movements were most likely related to external stimuli the horse moved his head to see or hear.
The research team concluded that inertial sensors are minimally affected by the operator who applies them; their results are similar whether an experienced person or a novice applies the sensors.
Read more at HorseTalk.
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