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An exploration of strategies used by dressage horses to control moments around the center of mass when performing passage

BACKGROUND: Locomotion results from the generation of ground reaction forces (GRF) that cause translations of the center of mass (COM) and generate moments that rotate the body around the COM. The trot is a diagonally-synchronized gait performed by horses at intermediate locomotor speeds. Passage is...

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Autores principales: Clayton, Hilary M., Hobbs, Sarah Jane
Formato: Online Artículo Texto
Lenguaje:English
Publicado: PeerJ Inc. 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5623309/
https://www.ncbi.nlm.nih.gov/pubmed/28970972
http://dx.doi.org/10.7717/peerj.3866
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author Clayton, Hilary M.
Hobbs, Sarah Jane
author_facet Clayton, Hilary M.
Hobbs, Sarah Jane
author_sort Clayton, Hilary M.
collection PubMed
description BACKGROUND: Locomotion results from the generation of ground reaction forces (GRF) that cause translations of the center of mass (COM) and generate moments that rotate the body around the COM. The trot is a diagonally-synchronized gait performed by horses at intermediate locomotor speeds. Passage is a variant of the trot performed by highly-trained dressage horses. It is distinguished from trot by having a slow speed of progression combined with great animation of the limbs in the swing phase. The slow speed of passage challenges the horse’s ability to control the sagittal-plane moments around the COM. Footfall patterns and peak GRF are known to differ between passage and trot, but their effects on balance management, which we define here as the ability to control nose-up/nose-down pitching moments around the horse’s COM to maintain a state of equilibrium, are not known. The objective was to investigate which biomechanical variables influence pitching moments around the COM in passage. METHODS: Three highly-trained dressage horses were captured by a 10-camera motion analysis system (120 Hz) as they were ridden in passage over four force platforms (960 Hz). A full-body marker set was used to track the horse’s COM and measure balance variables including total body center of pressure (COP), pitching moments, diagonal dissociation timing, peak force production, limb protraction–retraction, and trunk posture. A total of twenty passage steps were extracted and partial correlation (accounting for horse) was used to investigate significant (P < 0.05) relationships between variables. RESULTS: Hindlimb mean protraction–retraction correlated significantly with peak hindlimb propulsive forces (R = 0.821; P < 0.01), mean pitching moments (R = 0.546, P = 0.016), trunk range of motion, COM craniocaudal location and diagonal dissociation time (P < 0.05). DISCUSSION: Pitching moments around the COM were controlled by a combination of kinematic and kinetic adjustments that involve coordinated changes in GRF magnitudes, GRF distribution between the diagonal limb pairs, and the moment arms of the vertical GRFs. The moment arms depend on hoof placements relative to the COM, which were adjusted by changing limb protraction–retraction angles. Nose-up pitching moments could also be increased by providing a larger hindlimb propulsive GRF.
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spelling pubmed-56233092017-10-02 An exploration of strategies used by dressage horses to control moments around the center of mass when performing passage Clayton, Hilary M. Hobbs, Sarah Jane PeerJ Animal Behavior BACKGROUND: Locomotion results from the generation of ground reaction forces (GRF) that cause translations of the center of mass (COM) and generate moments that rotate the body around the COM. The trot is a diagonally-synchronized gait performed by horses at intermediate locomotor speeds. Passage is a variant of the trot performed by highly-trained dressage horses. It is distinguished from trot by having a slow speed of progression combined with great animation of the limbs in the swing phase. The slow speed of passage challenges the horse’s ability to control the sagittal-plane moments around the COM. Footfall patterns and peak GRF are known to differ between passage and trot, but their effects on balance management, which we define here as the ability to control nose-up/nose-down pitching moments around the horse’s COM to maintain a state of equilibrium, are not known. The objective was to investigate which biomechanical variables influence pitching moments around the COM in passage. METHODS: Three highly-trained dressage horses were captured by a 10-camera motion analysis system (120 Hz) as they were ridden in passage over four force platforms (960 Hz). A full-body marker set was used to track the horse’s COM and measure balance variables including total body center of pressure (COP), pitching moments, diagonal dissociation timing, peak force production, limb protraction–retraction, and trunk posture. A total of twenty passage steps were extracted and partial correlation (accounting for horse) was used to investigate significant (P < 0.05) relationships between variables. RESULTS: Hindlimb mean protraction–retraction correlated significantly with peak hindlimb propulsive forces (R = 0.821; P < 0.01), mean pitching moments (R = 0.546, P = 0.016), trunk range of motion, COM craniocaudal location and diagonal dissociation time (P < 0.05). DISCUSSION: Pitching moments around the COM were controlled by a combination of kinematic and kinetic adjustments that involve coordinated changes in GRF magnitudes, GRF distribution between the diagonal limb pairs, and the moment arms of the vertical GRFs. The moment arms depend on hoof placements relative to the COM, which were adjusted by changing limb protraction–retraction angles. Nose-up pitching moments could also be increased by providing a larger hindlimb propulsive GRF. PeerJ Inc. 2017-09-28 /pmc/articles/PMC5623309/ /pubmed/28970972 http://dx.doi.org/10.7717/peerj.3866 Text en ©2017 Clayton and Hobbs http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.
spellingShingle Animal Behavior
Clayton, Hilary M.
Hobbs, Sarah Jane
An exploration of strategies used by dressage horses to control moments around the center of mass when performing passage
title An exploration of strategies used by dressage horses to control moments around the center of mass when performing passage
title_full An exploration of strategies used by dressage horses to control moments around the center of mass when performing passage
title_fullStr An exploration of strategies used by dressage horses to control moments around the center of mass when performing passage
title_full_unstemmed An exploration of strategies used by dressage horses to control moments around the center of mass when performing passage
title_short An exploration of strategies used by dressage horses to control moments around the center of mass when performing passage
title_sort exploration of strategies used by dressage horses to control moments around the center of mass when performing passage
topic Animal Behavior
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5623309/
https://www.ncbi.nlm.nih.gov/pubmed/28970972
http://dx.doi.org/10.7717/peerj.3866
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