Document Detail

Factors influencing variation in locomotor-respiratory coupling in standardbred trotters in the field.
MedLine Citation:
PMID:  17402484     Owner:  NLM     Status:  MEDLINE    
REASONS FOR PERFORMING STUDY: A close relationship between limb and respiratory rhythms has been shown in clinically healthy galloping horses due to mechanical constraints in the thoracic region. This synchronisation leads to a 1/1 ratio between stride frequency (SF) and respiratory frequency (RF) during galloping. Very little is known about locomotor-respiratory coupling (LRC) during fast trot. OBJECTIVES: To investigate stride and respiratory rates during a standardised exercise test on the track in Standardbred Trotters. METHODS: Forty-four French trotters age 2-10 years performed a standardised exercise test consisting of three 3 min steps at constant speeds. Speed (V) of exercise varied between 500 and 750 m/min. Variables measured during exercise: SF, heart rate, RF using a microphone between the nostrils, blood lactate concentration. Physiological variables V4 and V200 were calculated and race performance index recorded. RESULTS: There was no age-related difference in RF or in LRC. Two LRC strategies were found: around 1/1 ratio and 3/2 ratio between SF and RF, respectively. A relationship between SF/RF ratio and physiological parameters showed a higher LRC in good performers because of a lower RF during submaximal and maximal exercise. CONCLUSION: RF is significantly lower and LRC significantly higher in good compared to poor performers. POTENTIAL RELEVANCE: Investigation is required to ensure that the breathing techniques of trotters may be used in the selection process of racehorses.
C Cotrel; C Leleu; A Courouce-Malblanc
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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:  2006 Aug 
Date Detail:
Created Date:  2007-04-03     Completed Date:  2007-05-02     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:  562-6     Citation Subset:  IM    
Pégase Mayenne, Département de médecine du Sport, Centre Hospitalier, 53 015 Laval, France.
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MeSH Terms
Age Factors
Cross-Sectional Studies
Exercise Test / veterinary
Heart Rate / physiology
Horses / physiology*
Lactates / blood
Locomotion / physiology*
Physical Conditioning, Animal / physiology*
Respiratory Mechanics / physiology
Reg. No./Substance:

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

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