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Effect of age on locomotion of Standardbred trotters in training

Published online by Cambridge University Press:  09 March 2007

C Leleu ,
C Cotrel  and
E Barrey
C Leleu*
Affiliation:
Pégase Mayenne, Departement de médecine du Sport, Centre Hospitalier, F-53015 Laval, France
C Cotrel
Affiliation:
Pégase Mayenne, Departement de médecine du Sport, Centre Hospitalier, F-53015 Laval, France
E Barrey
Affiliation:
INRA, Station de génétique Quantitative et Appliquée, F-78352 Jouy en Josas, France
*
*[email protected]
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Abstract

In Standardbreds, the main aim of early training (begun during the growth period) is the mechanization of athletes leading to a particular gait called the ‘flying trot’. The present cross-sectional study was undertaken to investigate the biomechanical and physiological factors involved in this gait change, and aimed to analyse the effect of age on gait and energetic variables in a population of Standardbred horses under training. One hundred and forty-three horses aged from two to seven years were tested on a track at three speeds (8.5, 10 and 11.6 m s−1) with a gait-analysis system. Gait variables (temporal and linear variables, symmetry, regularity, two-beat rhythm, dorso-ventral, longitudinal and lateral activities) were compared between four age groups (two-, three-, four-, and five-year-olds and above). After a standardized exercise test, two energetic variables (V4 and V200) were also compared between these groups. Most variables were influenced by age/training status. The results indicated that, from young to mature racehorses, stride length and duration increase; and gait becomes more symmetric and more regular. We also observed a decrease in dorso-ventral, longitudinal and lateral activities, i.e. a decrease of thoracic displacements. These differences could be elucidated at slow speed and were still obvious at high speed. V4 and V200 also increased significantly with age/training status. All of these results indicate an improvement in co-ordination and a decrease in metabolic cost with increasing age/training status. Thus gait acquisition could be related to an improvement in trotting efficiency.

Keywords

gaittrotbiomechanicsco-ordinationracing
Type
Research Article
Information
Equine and Comparative Exercise Physiology , Volume 1 , Issue 2 , May 2004 , pp. 107 - 117
Copyright
Copyright © Cambridge University Press 2004

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