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Equine Vet J. 2017 Jul;49(4):545-551. doi: 10.1111/evj.12651. Epub 2016 Dec 13.

Validation of distal limb mounted inertial measurement unit sensors for stride detection in Warmblood horses at walk and trot.

Author information

1
Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands.
2
Inertia Technology B.V., Enschede, the Netherlands.
3
Department of Computer Science, Pervasive Systems Group, University of Twente, Enschede, the Netherlands.
4
Rosmark Consultancy, Wekerom, the Netherlands.
5
Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht, the Netherlands.
6
Department of Surgery and Anaesthesiology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.

Abstract

BACKGROUND:

Inertial measurement unit (IMU) sensor-based techniques are becoming more popular in horses as a tool for objective locomotor assessment.

OBJECTIVES:

To describe, evaluate and validate a method of stride detection and quantification at walk and trot using distal limb mounted IMU sensors.

STUDY DESIGN:

Prospective validation study comparing IMU sensors and motion capture with force plate data.

METHODS:

A total of seven Warmblood horses equipped with metacarpal/metatarsal IMU sensors and reflective markers for motion capture were hand walked and trotted over a force plate. Using four custom built algorithms hoof-on/hoof-off timing over the force plate were calculated for each trial from the IMU data. Accuracy of the computed parameters was calculated as the mean difference in milliseconds between the IMU or motion capture generated data and the data from the force plate, precision as the s.d. of these differences and percentage of error with accuracy of the calculated parameter as a percentage of the force plate stance duration.

RESULTS:

Accuracy, precision and percentage of error of the best performing IMU algorithm for stance duration at walk were 28.5, 31.6 ms and 3.7% for the forelimbs and -5.5, 20.1 ms and -0.8% for the hindlimbs, respectively. At trot the best performing algorithm achieved accuracy, precision and percentage of error of -27.6/8.8 ms/-8.4% for the forelimbs and 6.3/33.5 ms/9.1% for the hindlimbs.

MAIN LIMITATIONS:

The described algorithms have not been assessed on different surfaces.

CONCLUSIONS:

Inertial measurement unit technology can be used to determine temporal kinematic stride variables at walk and trot justifying its use in gait and performance analysis. However, precision of the method may not be sufficient to detect all possible lameness-related changes. These data seem promising enough to warrant further research to evaluate whether this approach will be useful for appraising the majority of clinically relevant gait changes encountered in practice.

KEYWORDS:

gait analysis; horse; inertial measurement unit; kinematics; stride events

PMID:
27862238
PMCID:
PMC5484301
DOI:
10.1111/evj.12651
[Indexed for MEDLINE]
Free PMC Article

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