Document Detail

Effect of walking velocity on forelimb kinematics and kinetics.
MedLine Citation:
PMID:  12405709     Owner:  NLM     Status:  MEDLINE    
A database of biomechanical variables obtained from normal horses walking at a range of velocities is needed for comparison with the variables obtained from lame horses in which velocity cannot be predetermined. The objective was to investigate velocity-dependent changes in selected kinematic variables, ground reaction forces (GRF) and net joint energies in the forelimb and to develop statistical equations to calculate expected values of these variables for horses walking at different velocities. Five sound horses walked at a range of velocities (0.82 to 1.91 m/s) over a force plate. Kinematic data were recorded simultaneously for 51 trials. Kinematic, GRF and energetic variables were determined using standard methods. Correlation and simple regression analyses between velocity and measured variables were performed. An increase in walking velocity was correlated with an increase in stride length and decreases in stride and stance duration. Vertical, braking and propulsive impulses decreased as a consequence of the large reduction in stance duration, even though peak vertical, braking and propulsive GRFs increased. There was no significant increase in energy generation at any of the forelimb joints, indicating that muscle activity was not the source of the increase in GRFs. Changes in the longitudinal GRFs appeared to be influenced by velocity-dependent increases in head and neck oscillations. The equations obtained in this study can be used to calculate the expected normal variables from a range of walking velocities and to detect deviations from normal values in lame horses.
S Khumsap; H M Clayton; J L Lanovaz; M Bouchey
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Equine veterinary journal. Supplement     Volume:  -     ISSN:  -     ISO Abbreviation:  Equine Vet J Suppl     Publication Date:  2002 Sep 
Date Detail:
Created Date:  2002-10-30     Completed Date:  2003-02-26     Revised Date:  2007-05-18    
Medline Journal Info:
Nlm Unique ID:  9614088     Medline TA:  Equine Vet J Suppl     Country:  England    
Other Details:
Languages:  eng     Pagination:  325-9     Citation Subset:  IM    
Mary Anne McPhail Equine Performance Center, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing 48824, USA.
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MeSH Terms
Forelimb / physiology*
Gait / physiology*
Horses / physiology*
Locomotion / physiology*
Posture / physiology
Regression Analysis
Stress, Mechanical
Time Factors
Video Recording
Walking / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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