Training vs. Racing: A Comparison of Arrhythmias and the Repeatability of Findings in Thoroughbred Chuckwagon Racehorses

Arrhythmias are commonly reported in exercising horses, however due to regulatory constraints electrocardiograms (ECGs) are acquired during training but not competition, raising questions about the repeatability of findings. The aims were (1) compare training and competition arrhythmias and (2) desc...

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Bibliographic Details
Published in:The veterinary journal (1997) 2023-10, Vol.300-302, p.106040-106040, Article 106040
Main Authors: Massie, S.L., Bezugley, R.J., McDonald, K.J., Léguillette, R.
Format: Article
Language:English
Subjects:
Animals
arrhythmia
Arrhythmias
blood serum
Electrocardiograms (ECG)
exercise
heart rate
Horse Diseases - diagnosis
Horses
Lactates
lactic acid
Physical Conditioning, Animal - physiology
Racing
Reproducibility of Results
Thoroughbred
Thoroughbreds
Training
Troponin T
Ventricular Premature Complexes - diagnosis
Ventricular Premature Complexes - veterinary
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Summary:Arrhythmias are commonly reported in exercising horses, however due to regulatory constraints electrocardiograms (ECGs) are acquired during training but not competition, raising questions about the repeatability of findings. The aims were (1) compare training and competition arrhythmias and (2) describe the repeatability of arrhythmias during maximal-intensity exercise. A convenience sample of 52 healthy Thoroughbreds (aged 8.7±2.5 years) competing in the World Professional Chuckwagon Association were obtained, totaling 152 training or competition ECGs (2-7 ECGs/horse). Speed, heart rate (HR) and arrhythmias (supraventricular premature complex, SVPC; ventricular premature complex, VPC) were examined. Pre- and post-recovery (approximately 6min) blood samples measured lactate and high-sensitivity troponin-T. Training and competition arrythmias were compared (Friedman’s test) and reliability of repeated ECGs assessed (intraclass correlation; P
ISSN:1090-0233
1532-2971
DOI:10.1016/j.tvjl.2023.106040