{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T09:09:00Z","timestamp":1791191340156,"version":"4.1.0"},"reference-count":30,"publisher":"American Veterinary Medical Association (AVMA)","issue":"10","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["ajvr"],"published-print":{"date-parts":[[2014,10]]},"abstract":"<jats:title>Abstract<\/jats:title>\n<jats:p><jats:bold>Objective<\/jats:bold>\u2014To determine whether echocardiographic variables differed between successful (elite) and less successful (nonelite) Arabian endurance horses.<\/jats:p>\n<jats:p><jats:bold>Animals<\/jats:bold>\u201434 Arabian horses that competed in endurance racing.<\/jats:p>\n<jats:p><jats:bold>Procedures<\/jats:bold>\u2014Horses were assigned to either an elite or nonelite group on the basis of results of a previous competition, and a standardized echocardiographic examination was performed on each horse within 1 to 4 weeks after that competition. Multivariable logistic regression with backward stepwise elimination was used to create a prediction model for the determination of horse status (elite or nonelite) as a function of the measured echocardiographic variables.<\/jats:p>\n<jats:p><jats:bold>Results<\/jats:bold>\u2014The elite and nonelite groups consisted of 23 and 11 horses, respectively. One horse in the nonelite group had a frequent ventricular dysrhythmia that could have negatively affected its performance and rider's safety, whereas none of the horses in the elite group had remarkable cardiac abnormalities. The left ventricular internal diameter during systole and diastole and left ventricular mass and stroke volume were significantly greater for horses in the elite group, compared with those for horses in the nonelite group. The final logistic regression model correctly predicted the horse status for all of the horses in the elite group and 8 of 11 horses in the nonelite group.<\/jats:p>\n<jats:p><jats:bold>Conclusions and Clinical Relevance<\/jats:bold>\u2014Results indicated that heart size was significantly associated with performance for Arabian endurance horses in a manner similar to findings for Thoroughbred and Standardbred racehorses in active competition.<\/jats:p>","DOI":"10.2460\/ajvr.75.10.893","type":"journal-article","created":{"date-parts":[[2014,9,25]],"date-time":"2014-09-25T14:55:23Z","timestamp":1411656923000},"page":"893-898","source":"Crossref","is-referenced-by-count":21,"title":["Comparison of echocardiographic measurements in elite and nonelite Arabian endurance horses"],"prefix":"10.2460","volume":"75","author":[{"given":"Meg M.","family":"Sleeper","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mary 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horse","volume":"1","author":"Physick-Sheard","year":"1985"},{"key":"ref3","series-title":"Exp Physiol","doi-asserted-by":"publisher","first-page":"659","DOI":"10.1113\/eph8802615","article-title":"Equine athletes, the equine athlete's heart and racing success","volume":"88","author":"Young","year":"2003"},{"key":"ref4","series-title":"J Equine Vet Sci","doi-asserted-by":"publisher","first-page":"149","DOI":"10.1053\/jevs.2003.46","article-title":"The relationship of selected two-dimensional echocardiographic measurements to the racing performance of 5,431 yearlings and 2,003 two-year-old Thoroughbred racehorses","volume":"23","author":"Seder","year":"2003"},{"key":"ref5","series-title":"J Appl Physiol","doi-asserted-by":"publisher","first-page":"1278","DOI":"10.1152\/japplphysiol.01319.2004","article-title":"Left ventricular size and systolic function in Thoroughbred racehorses and their relationships to race performance","volume":"99","author":"Young","year":"2005"},{"issue":"30","key":"ref6","series-title":"Equine Vet J Suppl","first-page":"190","article-title":"Relationship between o2 max, heart score and echocardiographic measurements obtained at rest and immediately following maximal exercise in Thoroughbred horses","author":"Sampson","year":"1999"},{"key":"ref7","series-title":"Int J Sports Med","doi-asserted-by":"publisher","first-page":"219","DOI":"10.1055\/s-2007-1021257","article-title":"Relationships between cardiac dimensions, anthropometric characteristics and maximal aerobic power (VO2max) in young men","volume":"13","author":"Osborne","year":"1992"},{"key":"ref8","series-title":"Physiology of sport and exercise.","first-page":"214","article-title":"Cardiorespiratory adaptations to training","author":"Wilmore","year":"1994"},{"key":"ref9","series-title":"Saudi Med J","first-page":"320","article-title":"Echocardiographic dimensions and maximal oxygen uptake in elite soccer players","volume":"22","author":"Al-Hazzaa","year":"2001"},{"issue":"34","key":"ref10","series-title":"Equine Vet J Suppl","first-page":"467","article-title":"Heart size estimated by echocardiography correlates with maximal oxygen uptake","author":"Young","year":"2002"},{"key":"ref11","series-title":"Med J Aust","first-page":"78","article-title":"The electrocardiogram of racehorses: a preliminary communication","volume":"44","author":"Steel","year":"1957"},{"key":"ref12","series-title":"J Vet Sci","doi-asserted-by":"publisher","first-page":"259","DOI":"10.4142\/jvs.2004.5.3.259","article-title":"Echocardiography and electrocardiography as means to evaluate potential performance in horses","volume":"5","author":"Lightowler","year":"2004"},{"key":"ref13","series-title":"Vet J","first-page":"557","article-title":"The use of electrocardiography to estimate heart weight and predict performance in the racehorse","volume":"56","author":"Moodie","year":"1980"},{"key":"ref14","series-title":"Equine exercise physiology 3","first-page":"188","article-title":"Electrocardiographic and echocardiographic measurements and their relationships in Thoroughbred yearlings to subsequent performance","author":"Leahdon","year":"1991"},{"key":"ref15","series-title":"Am J Physiol","doi-asserted-by":"publisher","first-page":"512","DOI":"10.1152\/ajplegacy.1932.99.2.512","article-title":"Studies in the physiology of exercise X: the effects of running and swimming on the organ weights of growing dogs","volume":"99","author":"Steinhaus","year":"1932"},{"key":"ref16","series-title":"Can J Appl Sport Sci","first-page":"66","article-title":"Physical conditioning effects on cardiac dimensions: a review of echocardiographic studies","volume":"11","author":"Wolfe","year":"1986"},{"key":"ref17","series-title":"Sports Med","doi-asserted-by":"publisher","first-page":"288","DOI":"10.2165\/00007256-199417050-00003","article-title":"Exercise-induced cardiac hypertrophy. Fact or fallacy?","volume":"17","author":"Perrault","year":"1994"},{"key":"ref18","series-title":"Equine Vet J Suppl","first-page":"184","article-title":"Plasma atrial natriuretic peptide during and after repeated exercise under heat exposure","volume":"30","author":"Kokkonen","year":"1999"},{"key":"ref19","series-title":"Am J Vet Res","doi-asserted-by":"publisher","first-page":"1553","DOI":"10.2460\/ajvr.2000.61.1553","article-title":"Changes in cardiac dimensions and indices of cardiac function during deconditioning in horses","volume":"61","author":"Kriz","year":"2000"},{"key":"ref20","series-title":"J Am Vet Med Assoc","doi-asserted-by":"publisher","first-page":"205","DOI":"10.2460\/javma.240.2.205","article-title":"Echocardiographic evaluation of changes in left ventricular size and valvular regurgitation associated with physical training during and after maturity in Standardbred trotters","volume":"240","author":"Buhl","year":"2012"},{"key":"ref21","series-title":"J Appl Physiol","doi-asserted-by":"publisher","first-page":"1368","DOI":"10.1152\/jappl.1998.85.4.1368","article-title":"Effect of endurance training on cardiac morphology in Alaskan sled dogs","volume":"85","author":"Stepien","year":"1998"},{"key":"ref22","series-title":"Circ Res","doi-asserted-by":"publisher","first-page":"883","DOI":"10.1161\/01.RES.35.6.883","article-title":"Influences of physical training on the heart of dogs","volume":"35","author":"Wyatt","year":"1974"},{"issue":"30","key":"ref23","series-title":"Equine Vet J Suppl","first-page":"195","article-title":"Cardiac responses to training in 2-year-old Thoroughbreds: an echocardiographic study","author":"Young","year":"1999"},{"key":"ref24","series-title":"J Am Coll Cardiol","doi-asserted-by":"publisher","first-page":"190","DOI":"10.1016\/S0735-1097(86)80282-0","article-title":"Structural features of the athlete's heart as defined by echocardiography","volume":"7","author":"Maron","year":"1986"},{"key":"ref25","series-title":"J Am Vet Med Assoc","doi-asserted-by":"publisher","first-page":"1881","DOI":"10.2460\/javma.2005.226.1881","article-title":"Changes over time in echocardiographic measurements in young Standardbred racehorses undergoing training and racing and association with racing performance","volume":"226","author":"Buhl","year":"2005"},{"key":"ref26","series-title":"Equine Vet J","doi-asserted-by":"publisher","first-page":"226","DOI":"10.1111\/j.2042-3306.1992.tb02820.x","article-title":"Standardised imaging technique for guided M-mode and Doppler echocardiography in the horse","volume":"24","author":"Long","year":"1992"},{"key":"ref27","series-title":"Equine Vet J","doi-asserted-by":"publisher","first-page":"361","DOI":"10.1111\/j.2042-3306.1985.tb02522.x","article-title":"Comparison of echocardiographic and autopsy measurements of cardiac dimensions in the horse","volume":"17","author":"O'Callaghan","year":"1985"},{"key":"ref28","series-title":"J Vet Intern Med","doi-asserted-by":"publisher","first-page":"737","DOI":"10.1111\/j.1939-1676.2005.tb02754.x","article-title":"Cardiac output measurement by partial carbon dioxide rebreathing, 2-dimensional echocardiography, and lithium-dilution method in anesthetized neonatal foals","volume":"19","author":"Gigu\u00e8re","year":"2005"},{"key":"ref29","series-title":"Equine Vet J Suppl","first-page":"56","article-title":"Physiological valvular regurgitation in clinically normal young racehorses: prevalence and two-dimensional colour flow Doppler echocardiographic characteristics","volume":"19","author":"Marr","year":"1995"},{"key":"ref30","series-title":"J Vet Intern Med","doi-asserted-by":"publisher","first-page":"418","DOI":"10.1111\/j.1939-1676.2008.0053.x","article-title":"Heart murmurs and valvular regurgitation in Thoroughbred racehorses: epidemiology and associations with athletic 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