The effect of curve running on distal limb kinematics in the Thoroughbred racehorse.
Abstract: During racing, injury is more likely to occur on a bend than on a straight segment of track. This study aimed to quantify the effects of galloping at training speeds on large radius curves on stride parameters and limb lean angle in order to assess estimated consequences for limb loading. Seven Thoroughbred horses were equipped with a sacrum-mounted inertial measurement unit with an integrated GPS, two hoof-mounted accelerometers and retro-reflective markers on the forelimbs. Horses galloped 2-4 circuits anticlockwise around an oval track and were filmed at 120 frames per second using an array of ten cameras. Speed and curve radius were derived from GPS data and used to estimate the centripetal acceleration necessary to navigate the curve. Stride, stance and swing durations and duty factor (DF) were derived from accelerometer data. Limb markers were tracked and whole limb and third metacarpus (MCIII) angles were calculated. Data were analysed using mixed effects models with a significance level of p < 0.05. For horses galloping on the correct lead, DF was higher for the inside (lead) leg on the straight and on the curve. For horses galloping on the incorrect lead, there was no difference in DF between inside and outside legs on the straight or on the curve. DF decreased by 0.61% of DF with each 1 m s-2 increase in centripetal acceleration (p < 0.001). Whole limb inclination angle increased by 1.5° per 1 m s-1 increase in speed (p = 0.002). Limb lean angles increase as predicted, and lead limb function mirrors the functional requirements for curve running. A more comprehensive understanding of the effects of lean and torque on the distal limb is required to understand injury mechanisms.
Publication Date: 2020-12-29 PubMed ID: 33373408PubMed Central: PMC7771664DOI: 10.1371/journal.pone.0244105Google Scholar: Lookup
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- Journal Article
- Research Support
- Non-U.S. Gov't
Summary
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The research focuses on understanding the impact of running on curved track sections on equine limb kinematics, with an aim to analyze potential injury risks for racing Thoroughbreds.
Research Methodology
- The researchers chose seven Thoroughbred horses for the study. These horses were fitted with a sacrum-mounted inertial measurement unit along with an integrated GPS. They also had two accelerometers attached to their hooves and retro-reflective markers were placed on their forelimbs.
- The horses were then made to gallop 2-4 circuits anticlockwise around an oval track while they were being filmed at a rate of 120 frames per second using ten cameras. The researchers could thus derive the speed and curve radius data from the GPS, allowing them to calculate the centripetal acceleration necessary for the horses to navigate the curve.
Data Analysis
- The researchers extracted stride, stance, swing durations, and duty factor (DF), which denotes the proportion of one complete stride for which the foot is on the ground, from the data gathered from the accelerometer. Limb markers were tracked and angles for the whole limb and third metacarpus (MCIII) were calculated.
- The data were further analyzed through mixed effects models with a significance level of p < 0.05.
Findings
- The study found that for horses galloping on the correct lead, the DF was higher for the inside or lead leg both on a straight path and on a curve.
- Conversely, for horses that galloped on the incorrect lead, the researchers observed no difference in DF between the inside and outside legs, be it on a straight or curved path.
- They also found that DF decreased by 0.61% with each 1 meter per second squared increase in centripetal acceleration.
- The whole limb inclination increased by 1.5 degrees per 1 meter per second increase in speed.
Implications
- The findings suggested that limb lean angles increase as predicted and the lead limb function mirrors the functional requirements for curve running.
- This research subsequently indicates the need for a more comprehensive understanding of the impacts of leaning and torque on the horse’s distal limb for understanding potential injury mechanisms.
Cite This Article
APA
Parkes RSV, Pfau T, Weller R, Witte TH.
(2020).
The effect of curve running on distal limb kinematics in the Thoroughbred racehorse.
PLoS One, 15(12), e0244105.
https://doi.org/10.1371/journal.pone.0244105 Publication
Researcher Affiliations
- Department of Veterinary Clinical Sciences, City University of Hong Kong, Kowloon, Hong Kong.
- Department of Clinical Science and Services & Structure and Motion Lab, Royal Veterinary College, South Mimms, Hertfordshire, United Kingdom.
- Department of Clinical Science and Services & Structure and Motion Lab, Royal Veterinary College, South Mimms, Hertfordshire, United Kingdom.
- Department of Clinical Science and Services & Structure and Motion Lab, Royal Veterinary College, South Mimms, Hertfordshire, United Kingdom.
- Department of Clinical Science and Services & Structure and Motion Lab, Royal Veterinary College, South Mimms, Hertfordshire, United Kingdom.
MeSH Terms
- Animals
- Biomechanical Phenomena
- Forelimb / physiology
- Gait / physiology
- Horses / physiology
- Running / physiology
Conflict of Interest Statement
TP is owner of EquiGait providing gait analysis products and services. These products were not used in this study. This does not alter our adherence to PLOS ONE policies on sharing data and materials.
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Citations
This article has been cited 4 times.- Logan AA, Snyder AJ, Nielsen BD. Circle Diameter Impacts Stride Frequency and Forelimb Stance Duration at Various Gaits in Horses.. Sensors (Basel) 2023 Apr 24;23(9).
- Logan AA, Nielsen BD, Hiney KM, Robison CI, Manfredi JM, Buskirk DD, Popovich JM Jr. The Impact of Circular Exercise Diameter on Bone and Joint Health of Juvenile Animals.. Animals (Basel) 2022 May 27;12(11).
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- Logan AA, Nielsen BD, Robison CI, Hallock DB, Manfredi JM, Hiney KM, Buskirk DD, Popovich JM Jr. Impact of Gait and Diameter during Circular Exercise on Front Hoof Area, Vertical Force, and Pressure in Mature Horses.. Animals (Basel) 2021 Dec 17;11(12).
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