Causes of poor performance of horses during training, racing, or showing: 348 cases (1992-1996).
Abstract: To determine results for horses undergoing a high-speed treadmill examination, including videoendoscopy of the pharynx and larynx before and during exercise, echocardiography before and after exercise, and electrocardiography before, during, and after exercise, because of poor performance. Methods: Retrospective study. Methods: 348 horses. Results: A definitive diagnosis was obtained for 256 (73.5%) horses. One hundred forty-eight horses had dynamic obstruction of the airway during exercise, 33 had clinically important cardiac arrhythmias alone, 22 had a combination of dynamic airway obstruction and clinically important cardiac arrhythmias, 19 had poor cardiac fractional shortening immediately after exercise, 10 had exertional rhabdomyolyis, 15 had clinically apparent lameness, and 9 had other disorders. Thirty-nine of the horses with dynamic obstruction of the airway during exercise had multiple airway abnormalities. Fifty-three horses also had subclinical myopathy Conclusions: Results suggest that a complete evaluation, including a high-speed treadmill examination, should be conducted in horses with poor performance, regardless or whether horses do or do not have a history of abnormal respiratory noises and particularly if the horses have grade-II or -III left laryngeal hemiplegia.
Publication Date: 2000-02-25 PubMed ID: 10687012DOI: 10.2460/javma.2000.216.554Google Scholar: Lookup
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- Journal Article
- Airway Disease
- Cardiac Arrhythmias
- Cardiovascular Health
- Clinical Study
- Diagnosis
- Diagnostic Technique
- Disease Diagnosis
- Disease Etiology
- Equine Health
- Exercise
- Horses
- Lameness
- Larynx
- Performance Horses
- Pharynx
- Respiratory Health
- Retrospective Study
- Treadmill Exercise
- Veterinary Care
- Veterinary Medicine
- Veterinary Research
Summary
This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.
This research study examines why horses might underperform during training, racing, or showing. Researchers used various medical testing methods on 348 horses to find the causes of poor performance. The results showed that most horses had a physical ailment that caused their performance issues; diagnosable issues included conditions affecting airway functionality, cardiac arrhythmias, and others. The study concludes by recommending complete evaluations, involving high-speed treadmill examinations, for poorly performing horses, especially those with known respiratory issues or left laryngeal hemiplegia.
Research Methodology
- The study was retrospective in nature, i.e., it looks back on past events or conditions and involved 348 horses.
- The daignostic tools employed were videoendoscopy to the pharynx and larynx before and during exercise, echocardiography before and after exercise, and electrocardiography before, during, and after exercise. These methods were used to perform a high-speed treadmill examination.
Research Findings
- Out of all tested horses, 256 (73.5%) had a definitive diagnosis.
- One hundred forty-eight horses had dynamic obstruction of the airway during exercise.
- Thirty-three horses had significant cardiac arrhythmias.
- Twenty-two horses had a combination of dynamic airway obstruction and clinically important cardiac arrhythmias.
- Nineteen horses had inferior cardiac fractional shortening immediately after exercise.
- Ten horses were diagnosed with exertional rhabdomyolysis.
- Fifteen horses showed clinically apparent lameness.
- Nine horses had other disorders.
- Among the horses with dynamic obstruction of the airway during exercise, 39 had multiple airway abnormalities.
- Fifty-three other horses also had a subclinical myopathy.
Conclusion and Recommendation
- The study suggests that horses with poor performance should undergo a full evaluation, including a high-speed treadmill examination. This is regardless of whether they’ve had a history of abnormal respiratory noises or not.
- The recommendation is particularly urgent for horses suffering from grade-II or -III left laryngeal hemiplegia.
Cite This Article
APA
Martin BB, Reef VB, Parente EJ, Sage AD.
(2000).
Causes of poor performance of horses during training, racing, or showing: 348 cases (1992-1996).
J Am Vet Med Assoc, 216(4), 554-558.
https://doi.org/10.2460/javma.2000.216.554 Publication
Researcher Affiliations
- Department of Clinical Studies, New Bolton Center, University of Pennsylvania, Kennett Square 19348, USA.
MeSH Terms
- Airway Obstruction / diagnosis
- Airway Obstruction / physiopathology
- Airway Obstruction / veterinary
- Animals
- Arrhythmias, Cardiac / diagnosis
- Arrhythmias, Cardiac / physiopathology
- Arrhythmias, Cardiac / veterinary
- Arytenoid Cartilage / pathology
- Cardiomyopathies / diagnosis
- Cardiomyopathies / physiopathology
- Cardiomyopathies / veterinary
- Creatine Kinase / blood
- Echocardiography / veterinary
- Electrocardiography / veterinary
- Exercise Test / veterinary
- Female
- Heart Murmurs / diagnosis
- Heart Murmurs / physiopathology
- Heart Murmurs / veterinary
- Horse Diseases / diagnosis
- Horse Diseases / etiology
- Horse Diseases / physiopathology
- Horses
- Lameness, Animal / diagnosis
- Lameness, Animal / physiopathology
- Laryngeal Diseases / diagnosis
- Laryngeal Diseases / physiopathology
- Laryngeal Diseases / veterinary
- Laryngoscopy / veterinary
- Male
- Physical Conditioning, Animal
- Respiratory Sounds / diagnosis
- Respiratory Sounds / physiopathology
- Respiratory Sounds / veterinary
- Retrospective Studies
- Rhabdomyolysis / diagnosis
- Rhabdomyolysis / physiopathology
- Rhabdomyolysis / veterinary
- Videotape Recording
Citations
This article has been cited 26 times.- McCrae P, Spong H, Moorehead J, Pearson W. Validation of a smart textile device for long-duration heart rate variability and detection of physiological arrhythmias in resting horses. BMC Vet Res 2025 Nov 19;21(1):675.
- Jeong S, Bond S, Bayly W, Sole-Guitart A. Laser fenestration of the dorsal pharyngeal recess does not correct experimentally induced dorsal nasopharyngeal collapse in horses. Vet Surg 2026 Jan;55(1):88-100.
- Jimenez C, Hogan P, Belaghi R, Curtiss A. Equine epiglottitis: Diagnosis, treatment and outcome. Equine Vet J 2026 Jan;58(1):143-149.
- Mazzei M, Sorvillo B, Sgorbini M, Bindi F, Perelli A, Laus F. The Role of Viral Pathogens in Horse Respiratory Diseases: A Cytological and Molecular Approach Using Next-Generation Sequencing. Animals (Basel) 2024 Nov 21;14(23).
- Cassiers V, McNally T. Technique description and outcome evaluation of Thoroughbred racehorses following soft palate thermocautery performed under standing sedation. Vet Med Sci 2024 Sep;10(5):e70018.
- Scholler D, Wittenberg J, Zablotski Y, May A. Do tight nosebands have an effect on the upper airways of horses?. Vet Med Sci 2024 Jul;10(4):e1478.
- Lo Feudo CM, Stucchi L, Stancari G, Conturba B, Bozzola C, Zucca E, Ferrucci F. Associations between Medical Disorders and Racing Outcomes in Poorly Performing Standardbred Trotter Racehorses: A Retrospective Study. Animals (Basel) 2023 Aug 9;13(16).
- Lo Feudo CM, Stucchi L, Conturba B, Stancari G, Zucca E, Ferrucci F. Medical causes of poor performance and their associations with fitness in Standardbred racehorses. J Vet Intern Med 2023 Jul-Aug;37(4):1514-1527.
- Khalesi H, Sakha M, Veshkini A, Rezakhani A. Assessing the cardiac valves conditions in athletic horses with poor performance. Vet Res Forum 2022 Sep;13(3):423-429.
- Lo Feudo CM, Stancari G, Collavo F, Stucchi L, Conturba B, Zucca E, Ferrucci F. Upper and Lower Airways Evaluation and Its Relationship with Dynamic Upper Airway Obstruction in Racehorses. Animals (Basel) 2022 Jun 17;12(12).
- Van Steenkiste G, Delhaas T, Hermans B, Vera L, Decloedt A, van Loon G. An Exploratory Study on Vectorcardiographic Identification of the Site of Origin of Focally Induced Premature Depolarizations in Horses, Part II: The Ventricles. Animals (Basel) 2022 Feb 23;12(5).
- Ahern BJ, Sole A, de Klerk K, Hogg LR, Vallance SA, Bertin FR, Franklin SH. Evaluation of postsale endoscopy as a predictor of future racing performance in an Australian thoroughbred yearling population. Aust Vet J 2022 Jun;100(6):254-260.
- Ter Woort F, Dubois G, Tansley G, Didier M, Verdegaal L, Franklin S, Van Erck-Westergren E. Validation of an equine fitness tracker: ECG quality and arrhythmia detection. Equine Vet J 2022 Feb 9;55(2):336-43.
- Alberti E, Stucchi L, Lo Feudo CM, Stancari G, Conturba B, Ferrucci F, Zucca E. Evaluation of Cardiac Arrhythmias before, during, and after Treadmill Exercise Testing in Poorly Performing Standardbred Racehorses. Animals (Basel) 2021 Aug 16;11(8).
- Morini M, Peli A, Rinnovati R, Magazzù G, Romagnoli N, Spadari A, Pietra M. Immunohistochemical Expression of Neurokinin-A and Interleukin-8 in the Bronchial Epithelium of Horses with Severe Equine Asthma Syndrome during Asymptomatic, Exacerbation, and Remission Phase. Animals (Basel) 2021 May 12;11(5).
- Nath LC, Elliott AD, Weir J, Curl P, Rosanowski SM, Franklin S. Incidence, recurrence, and outcome of postrace atrial fibrillation in Thoroughbred horses. J Vet Intern Med 2021 Mar;35(2):1111-1120.
- Benito M, Boutigny L. Cardiovascular Clinical Assessment in Greyster Dogs in Bikejöring Training. Animals (Basel) 2020 Sep 11;10(9).
- Hunt S, Kuo J, Aristizabal FA, Brown M, Patwardhan A, Hedman T. Soft Palate Modification Using a Collagen Crosslinking Reagent for Equine Dorsal Displacement of the Soft Palate and Other Upper Airway Breathing Disorders. Int J Biomater 2019;2019:9310890.
- Frick L, Schwarzwald CC, Mitchell KJ. The use of heart rate variability analysis to detect arrhythmias in horses undergoing a standard treadmill exercise test. J Vet Intern Med 2019 Jan;33(1):212-224.
- Tosi I, Art T, Cassart D, Farnir F, Ceusters J, Serteyn D, Lemieux H, Votion DM. Altered mitochondrial oxidative phosphorylation capacity in horses suffering from polysaccharide storage myopathy. J Bioenerg Biomembr 2018 Oct;50(5):379-390.
- Li M, Chadda KR, Matthews GDK, Marr CM, Huang CL, Jeevaratnam K. Cardiac electrophysiological adaptations in the equine athlete-Restitution analysis of electrocardiographic features. PLoS One 2018;13(3):e0194008.
- Barton AK, Gehlen H. Pulmonary Remodeling in Equine Asthma: What Do We Know about Mediators of Inflammation in the Horse?. Mediators Inflamm 2016;2016:5693205.
- Flethøj M, Kanters JK, Pedersen PJ, Haugaard MM, Carstensen H, Olsen LH, Buhl R. Appropriate threshold levels of cardiac beat-to-beat variation in semi-automatic analysis of equine ECG recordings. BMC Vet Res 2016 Nov 28;12(1):266.
- Lanata A, Guidi A, Baragli P, Valenza G, Scilingo EP. A Novel Algorithm for Movement Artifact Removal in ECG Signals Acquired from Wearable Systems Applied to Horses. PLoS One 2015;10(10):e0140783.
- Hamond C, Martins G, Lilenbaum W. Subclinical leptospirosis may impair athletic performance in racing horses. Trop Anim Health Prod 2012 Dec;44(8):1927-30.
- Isgren CM, Upjohn MM, Fernandez-Fuente M, Massey C, Pollott G, Verheyen KL, Piercy RJ. Epidemiology of exertional rhabdomyolysis susceptibility in standardbred horses reveals associated risk factors and underlying enhanced performance. PLoS One 2010 Jul 14;5(7):e11594.
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