Article (Scientific journals)
Altered systolic left ventricular function in horses completing a long distance endurance race
Amory, Hélène; Votion, Dominique; Fraipont, A. et al.
2010In Equine Veterinary Journal, 42 (38), p. 216-219
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Keywords :
echocardiography; horse; systolic function; long endurance exercise; exercise-induced cardiac fatigue; endurance
Abstract :
[en] Reasons for performing the study: It is unknown whether exercise-induced cardiac fatigue (EICF), as demonstrated in athletes performing long duration exercise, occurs in endurance horses. Objective: To examine the effects of a long distance endurance race on left ventricular systolic function in horses. Methods: Echocardiography was performed before and after a 2 or 3 star international endurance race (106 to 132 km) in 11 horses. Systolic (s) and diastolic (d) interventricular and left ventricular free wall thickness (IVS and LVFW, respectively), left ventricular, left atrial and aortic internal diameter (LVID, LA and Ao, respectively), fractional shortening (FS) and ejection fraction (EF) were measured by echocardiography. Heart rate (HR), peak flow velocity (Vmax), flow velocity integral (FVI), ejection time (ET), pre-ejection period (PEP), velocity of circumferential fiber shortening (Vcf), stroke volume (SV) and cardiac output (CO) were measured from aortic Doppler wave recordings. Results: After the race, LVIDd, Ao, LA, EF, FS, FVI, SV, ET and ET indexed for HR were significantly lower and IVSd, LVFWd, HR, PEP, PEP/ET, and Vcf were significantly higher as compared with pre-race values. Pre- to post-exercise changes in those parameters were not significantly correlated with changes in HR or in LVIDd. Conclusions: Results suggest that EICF, with a decrease in left ventricular systolic function, could occur post-exercise in horses performing long duration endurance races. However, a confounding effect of altered preload and heart rate on the studied variables cannot be discounted.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Amory, Hélène ;  Université de Liège - ULiège > Département clinique des animaux de compagnie et des équidés > Médecine interne des équidés
Votion, Dominique  ;  Université de Liège - ULiège > Département clinique des animaux de compagnie et des équidés > Anesthésiologie gén. et pathologie chirurg. des grds animaux
Fraipont, A.
Goachet, A. G.
Robert, C.
Farnir, Frédéric  ;  Université de Liège - ULiège > Département de productions animales > Biostatistiques et bioinformatique appliquées aux sc. vétér.
Van Erck, Emmanuelle 
Language :
English
Title :
Altered systolic left ventricular function in horses completing a long distance endurance race
Publication date :
2010
Journal title :
Equine Veterinary Journal
ISSN :
0425-1644
eISSN :
2042-3306
Publisher :
Equine Veterinary Journal Ltd, Newmarket Suffolk, United Kingdom
Volume :
42
Issue :
38
Pages :
216-219
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 May 2012

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