Use of an instrument sandwiched between the hoof and shoe to measure vertical ground reaction forces and three-dimensional acceleration at the walk, trot, and canter in horses.
OBJECTIVE
To develop an instrument that could be sandwiched between the hoof and shoe of horses and that would reliably measure vertical ground reaction forces and three-dimensional acceleration at the walk, trot, and canter.


METHODS
5 clinically sound Thoroughbreds.


METHODS
The recording instrument (weight, 350 g) consisted of 2 metal plates, 2 bolts, 4 load cells, and 3 accelerometers. It was mounted to the hoof with a glue-on shoe and devised to support as much load exerted by a limb as possible. The load cells and accelerometers were wired to a 16-channel transmitter, and transmitted signals were received and amplified with a telemetry receiver.


RESULTS
The recording instrument could measure in real time the 4 components of the ground reaction force or their resultant force along with acceleration in 3 dimensions as horses walked, trotted, or cantered on a treadmill. Patterns of force-time curves recorded for consecutive strides were similar to each other and to those previously reported, using a force plate.


CONCLUSIONS
The recording instrument developed for use in the present study allowed us to record vertical ground reaction force and acceleration in 3 dimensions in horses at the walk, trot, and canter.
Kai
M
M
Equine Research Institute, Japan Racing Association, Tochigi.
Aoki
O
O
Hiraga
A
A
Oki
H
H
Tokuriki
M
M
D000054:Acceleration; D000818:Animals; D005684:Gait / Q000502:physiology*; D006724:Hoof and Claw / Q000502:physiology*; D006736:Horses / Q000502:physiology*; D015203:Reproducibility of Results; D012775:Shoes; D013686:Telemetry / Q000295:instrumentation / Q000662:veterinary*; D014160:Transducers, Pressure / Q000662:veterinary; D014743:Videotape Recording