Iron Status in Sport Horses: Is It Important for Equine Athletes?
- Journal Article
- Review
Summary
This research article investigates the role of iron in the physical performance of sport horses, and its metabolism changes in response to physical exertion in these animals. The study also looks at the effects of different hormones on iron metabolism and performance-enhancing strategies for sport horses.
Understanding Iron Metabolism Changes in Sport Horses
The researchers work to summarize past studies that have delved into how the iron metabolism alters in response to physical effort in sport horses. Knowledge of this aspect is crucial as it contributes to horse performance in varying intensities of sport.
- The exercise-induced changes are implied to play a significant role in managing iron metabolism in these animals. Understanding these changes can shed light on the physiology of equine athletes and contribute significantly to their overall fitness and enhanced performance.
- The research also recognizes and acknowledges prevalent health conditions in sport horses such as gastrointestinal bleeding, hemolysis, and hematuria. These conditions are noted for their contribution to iron metabolism in sport horses.
The Effect of Inflammation and Hormones on Iron Metabolism
The paper examines the role of exercise-induced inflammation on iron homeostasis in horses. Here, the primary focus is on its potential to influence the functioning of hepcidin, a key iron-regulating entity present in mammals.
- The significance of hepcidin can’t be emphasized enough as it is as crucial for overall iron homeostasis in horses as in humans. Any changes in hepcidin functioning due to inflammation or other factors can greatly distort the iron balance in the horse’s body.
- The research also examines the possible effects that different hormones might have on iron metabolism. These insights are essential because hormonal changes can greatly affect metabolism, and understanding these interactions can open up new ways to enhance performance in sport horses.
Drawing Performance-Enhancing Strategies and Clinical Relevance
The study aims to present data regarding performance-enhancing strategies connected to iron metabolism among sport horses. It also emphasizes the clinical importance of regular monitoring of iron status in these animals.
- By highlighting the potential of iron metabolism to contribute to the overall performance, the research brings to light possible strategies to enhance performance through adjustments in diet, exercise, and supplements.
- Regular monitoring and understanding iron status in sport horses also have immense clinical relevance. By being alert to any fluctuations, early interventions can be put in place to prevent any detrimental impact on the horse’s performance or overall health.
- Additionally, understanding the nuanced aspects of iron metabolism in sport horses can bridge the knowledge gaps in equine sports medicine and contribute to better management practices for these animals.
Cite This Article
Publication
Researcher Affiliations
- Department of Large Animal Diseases and Clinic, Institute of Veterinary Medicine, Warsaw University of Life Sciences, 02-787 Warsaw, Poland.
- Department of Large Animal Diseases and Clinic, Institute of Veterinary Medicine, Warsaw University of Life Sciences, 02-787 Warsaw, Poland.
MeSH Terms
- Animals
- Horses / physiology
- Iron / metabolism
- Iron / blood
- Physical Conditioning, Animal
- Homeostasis
- Athletes
- Hepcidins / metabolism
- Humans
- Sports
- Anemia, Iron-Deficiency
Conflict of Interest Statement
References
- Lasocki S, Gaillard T, Rineau E. Iron is essential for living!. Crit. Care 2014;18:678.
- Lieu P.T, Heiskala M, Peterson P.A, Yang Y. The roles of iron in health and disease. Mol. Aspects Med. 2001;22:1–87.
- Roy R, Kück M, Radziwolek L, Kerling A. Iron Deficiency in Adolescent and Young Adult German Athletes-A Retrospective Study. Nutrients 2022;14:4511.
- Parks R.B, Hetzel S.J, Brooks M.A. Iron Deficiency and Anemia among Collegiate Athletes: A Retrospective Chart Review. Med. Sci. Sports Exerc. 2017;49:1711–1715.
- Sim M, Garvican-Lewis L.A, Cox G.R, Govus A, McKay A.K.A, Stellingwerff T, Peeling P. Iron considerations for the athlete: A narrative review. Eur. J. Appl. Physiol. 2019;119:1463–1478.
- Eichner E.R. Sports anemia, iron supplements, and blood doping. Med. Sci. Sports Exerc. 1992;24((Suppl. 9)):S315–S318.
- Clénin G, Cordes M, Huber A, Schumacher Y.O, Noack P, Scales J, Kriemler S. Iron deficiency in sports—Definition, influence on performance and therapy. Swiss Med. Wkly. 2015;145:w14196.
- Weaver C.M, Rajaram S. Exercise and iron status. J. Nutr. 1992;122((Suppl. 3)):782–787.
- Inoue Y, Matsui A, Asai Y, Aoki F, Matsui T, Yano H. Effect of exercise on iron metabolism in horses. Biol. Trace Elem. Res. 2005;107:33–42.
- Larsson J, Pilborg P.H, Johansen M, Christophersen M.T, Holte A, Roepstorff L, Olsen L.H, Harrison A.P. Physiological parameters of endurance horses pre- compared to post-race, correlated with performance: A two race study from scandinavia. ISRN Vet. Sci. 2013;2013:684353.
- Witkowska-Piłaszewicz O, Malin K, Dąbrowska I, Grzędzicka J, Ostaszewski P, Carter C. Immunology of Physical Exercise: Is Equus caballus an Appropriate Animal Model for Human Athletes?. Int. J. Mol. Sci. 2024;25:5210.
- McIlwraith C.W, Frisbie D.D, Kawcak C.E. The horse as a model of naturally occurring osteoarthritis. Bone Jt. Res. 2012;1:297–309.
- Patterson-Kane J.C, Becker D.L, Rich T. The pathogenesis of tendon microdamage in athletes: The horse as a natural model for basic cellular research. J. Comp. Pathol. 2012;147:227–247.
- Hooda J, Shah A, Zhang L. Heme, an essential nutrient from dietary proteins, critically impacts diverse physiological and pathological processes. Nutrients 2014;6:1080–1102.
- Skrzypczak W, Stefaniak T, Zabielski R. Fizjologia Noworodka. 2011. pp. 286–291.
- Hentze M.W, Muckenthaler M.U, Andrews N.C. Balancing acts: Molecular control of mammalian iron metabolism. Cell 2004;117:285–297.
- Malyszko J. Hepcidin assays: Ironing out some details. Clin. J. Am. Soc. Nephrol. 2009;4:1015–1016.
- Ganz T. Molecular control of iron transport. J. Am. Soc. Nephrol. 2007;18:394–400.
- National Research Council (NRC). The Nutrient Requirements of Horses. 6th ed.. 2022.
- Saran T, Zawadka M, Chmiel S, Mazur A. Sweat iron concentration during 4-week exercise training. Ann. Agric. Environ. Med. 2018;25:500–503.
- Waller M.F, Haymes E.M. The effects of heat and exercise on sweat iron loss. Med. Sci. Sports Exerc. 1996;28:197–203.
- Peeling P, Dawson B, Goodman C, Landers G, Trinder D. Athletic induced iron deficiency: New insights into the role of inflammation, cytokines and hormones. Eur. J. Appl. Physiol. 2008;103:381–391.
- Pakula P.D, Halama A, Al-Dous E.K, Johnson S.J, Filho S.A, Suhre K, Vinardell T. Characterization of exercise-induced hemolysis in endurance horses. Front. Vet. Sci. 2023;10:1115776.
- Masini A, Tedeschi D, Baragli P, Sighieri C, Lubas G. Exercise-induced intravascular haemolysis in standardbred horses. Comp. Clin. Pathol. 2003;12:45–48.
- Cywinska A, Szarska E, Kowalska A, Ostaszewski P, Schollenberger A. Gender differences in exercise-induced intravascular haemolysis during race training in thoroughbred horses. Res. Vet. Sci. 2011;90:133–137.
- Schott H.C. 2nd, Hodgson D.R, Bayly W.M. Haematuria, pigmenturia and proteinuria in exercising horses. Equine Vet. J. 1995;27:67–72.
- Fisher R.L, McMahon L.F. Jr, Ryan M.J, Larson D, Brand M. Gastrointestinal bleeding in competitive runners. Dig. Dis. Sci. 1986;31:1226–1228.
- Baska R.S, Moses F.M, Graeber G, Kearney G. Gastrointestinal bleeding during an ultramarathon. Dig. Dis. Sci. 1990;35:276–279.
- Grooteman K, van Geenen E, Kievit W, Drenth J. Chronic anemia due to gastrointestinal bleeding: When do gastroenterologists transfuse?. United Eur. Gastroenterol. J. 2017;5:967–973.
- Nieto J.E, Snyder J.R, Beldomenico P, Aleman M, Kerr J.W, Spier S.J. Prevalence of gastric ulcers in endurance horses—A preliminary report. Vet. J. 2004;167:33–37.
- Vatistas N.J, Snyder J.R, Carlson G, Johnson B, Arthur R.M, Thurmond M, Zhou H, Lloyd K.L. Cross-sectional study of gastric ulcers of the squamous mucosa in thoroughbred racehorses. Equine Vet. J. Suppl. 1999;31:34–39.
- Lo Feudo C.M, Stucchi L, Conturba B, Stancari G, Zucca E, Ferrucci F. Equine Gastric Ulcer Syndrome affects fitness parameters in poorly performing Standardbred racehorses. Front. Vet. Sci. 2022;9:1014619.
- Lo Feudo C.M, 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;37:1514–1527.
- Crispe E.J, Lester G.D. Exercise-induced Pulmonary Hemorrhage: Is It Important and Can It Be Prevented?. Vet. Clin. North. Am. Equine Pract. 2019;35:339–350.
- Cotroneo E, Ashek A, Wang L, Wharton J, Dubois O, Bozorgi S, Busbridge M, Alavian K.N, Wilkins M.R, Zhao L. Iron homeostasis and pulmonary hypertension: Iron deficiency leads to pulmonary vascular remodeling in the rat. Circ. Res. 2015;116:1680–1690.
- Kong W.N, Gao G, Chang Y.Z. Hepcidin and sports anemia. Cell Biosci. 2014;4:19.
- Nemeth E, Ganz T. The role of hepcidin in iron metabolism. Acta Haematol. 2009;122:78–86.
- Sim M, Dawson B, Landers G, Swinkels D.W, Tjalsma H, Trinder D, Peeling P. Effect of exercise modality and intensity on post-exercise interleukin-6 and hepcidin levels. Int. J. Sport. Nutr. Exerc. Metab. 2013;23:178–186.
- Peeling P, McKay A.K.A, Pyne D.B, Guelfi K.J, McCormick R.H, Laarakkers C.M, Swinkels D.W, Garvican-Lewis L.A, Ross M.L.R, Sharma A.P. Factors influencing the post-exercise hepcidin-25 response in elite athletes. Eur. J. Appl. Physiol. 2017;117:1233–1239.
- Badenhorst C.E, Dawson B, Goodman C, Sim M, Cox G.R, Gore C.J, Tjalsma H, Swinkels D.W, Peeling P. Influence of post-exercise hypoxic exposure on hepcidin response in athletes. Eur. J. Appl. Physiol. 2014;114:951–959.
- Newlin M.K, Williams S, McNamara T, Tjalsma H, Swinkels D.W, Haymes E.M. The effects of acute exercise bouts on hepcidin in women. Int. J. Sport Nutr. Exerc. Metab. 2012;22:79–88.
- Peeling P, Sim M, Badenhorst C.E, Dawson B, Govus A.D, Abbiss C.R, Swinkels D.W, Trinder D. Iron status and the acute post-exercise hepcidin response in athletes. PLoS ONE 2014;9:e93002.
- Liu W, Zhang S, Li Q, Wu Y, Jia X, Feng W, Li Z, Shi Y, Hou Q, Ma J. Lactate modulates iron metabolism by binding soluble adenylyl cyclase. Cell Metab. 2023;35:1597–1612.e6.
- Cerqueira É, Marinho D.A, Neiva H.P, Lourenço O. Inflammatory Effects of High and Moderate Intensity Exercise-A Systematic Review. Front. Physiol. 2020;10:1550.
- Beavers K.M, Brinkley T.E, Nicklas B.J. Effect of exercise training on chronic inflammation. Clin. Chim. Acta. 2010;411:785–793.
- Nemeth E, Rivera S, Gabayan V, Keller C, Taudorf S, Pedersen B.K, Ganz T. Hepcidin-The Culprit Explaining Disturbed Iron Homeostasis in Chronic Renal Disease?: IL-6 Mediates Hypoferremia of Inflammation by Inducing the Synthesis of the Iron Regulatory Hormone Hepcidin. J Clin Invest 113:1271-1276, 2004.. J. Am. Soc. Nephrol. 2005;16:287–290.
- Banzet S, Sanchez H, Chapot R, Bigard X, Vaulont S, Koulmann N. Interleukin-6 contributes to hepcidin mRNA increase in response to exercise. Cytokine 2012;58:158–161.
- Wlefting D.M, Andrews N.C. Interleukin-6 induces hepcidin expression through STAT3. Blood 2006;108:3204–3209.
- Witkowska-Piłaszewicz O, Bąska P, Czopowicz M, Żmigrodzka M, Szarska E, Szczepaniak J, Nowak Z, Winnicka A, Cywińska A. Anti-Inflammatory State in Arabian Horses Introduced to the Endurance Training. Animals 2019;9:616.
- Pedersen B.K, Steensberg A, Fischer C, Keller C, Keller P, Plomgaard P, Febbraio M, Saltin B. Searching for the exercise factor: Is IL-6 a candidate?. J. Muscle Res. Cell Motil. 2003;24:113–119.
- Oliveira-Filho J.P, Badial P.R, Cunha P.H, Peiró J.R, Araújo J.P. Jr, Divers T.J, Winand N.J, Borges A.S. Lipopolysaccharide infusion up-regulates hepcidin mRNA expression in equine liver. Innate Immun. 2012;18:438–446.
- Arfuso F, Giannetto C, Fazio F, Panzera F, Piccione G. Training Program Intensity Induces an Acute Phase Response in Clinically Healthy Horses. J. Equine Vet. Sci. 2020;88:102986.
- Kristensen L, Buhl R, Nostell K, Bak L, Petersen E, Lindholm M, Jacobsen S. Acute exercise does not induce an acute phase response (APR) in Standardbred trotters. Can. J. Vet. Res. 2014;78:97–102.
- Colahan P.T, Kollias-Bakert C, Leutenegger C.M, Jones J.H. Does training affect mRNA transciption for cytokine production in circulating leucocytes?. Equine Vet. J. Suppl. 2002;34:154–158.
- Witkowska-Piłaszewicz O, Pingwara R, Winnicka A. The Effect of Physical Training on Peripheral Blood Mononuclear Cell Ex Vivo Proliferation, Differentiation, Activity, and Reactive Oxygen Species Production in Racehorses. Antioxidants 2020;9:1155.
- Cadegiani F.A, Kater C.E. Hormonal aspects of overtraining syndrome: A systematic review. BMC Sports Sci. Med. Rehabil. 2017;9:14.
- Meeusen R, Nederhof E, Buyse L, Roelands B, de Schutter G, Piacentini M.F. Diagnosing overtraining in athletes using the two-bout exercise protocol. Br. J. Sports Med. 2010;44:642–648.
- Meeusen R, Piacentini M.F, Busschaert B, Buyse L, De Schutter G, Stray-Gundersen J. Hormonal responses in athletes: The use of a two bout exercise protocol to detect subtle differences in (over)training status. Eur. J. Appl. Physiol. 2004;91:140–146.
- Wang J, Liu G, Xu Z, Dai J, Song P, Shi J, Hu Y, Hu Z, Nie G, Chang Y.Z. Hepcidin levels in hyperprolactinemic women monitored by nanopore thin film based assay: Correlation with pregnancy-associated hormone prolactin. Nanomedicine 2015;11:871–878.
- Lehtihet M, Bonde Y, Beckman L, Berinder K, Hoybye C, Rudling M, Sloan J.H, Konrad R.J, Angelin B. Circulating Hepcidin-25 Is Reduced by Endogenous Estrogen in Humans. PLoS ONE 2016;11:e0148802.
- Moreno-Carranza B, Bravo-Manríquez M, Baez A, Ledesma-Colunga M.G, Ruiz-Herrera X, Reyes-Ortega P, de Los Ríos E.A, Macotela Y, Martínez de la Escalera G, Clapp C. Prolactin regulates liver growth during postnatal development in mice. Am. J. Physiol. Regul. Integr. Comp. Physiol. 2018;314:R902–R908.
- Thompson D.L. Jr, DePew C.L, Ortiz A, Sticker L.S, Rahmanian M.S. Growth hormone and prolactin concentrations in plasma of horses: Sex differences and the effects of acute exercise and administration of growth hormone-releasing hormone. J. Anim. Sci. 1994;72:2911–2918.
- Kitaura T, Sato F, Hada T, Ishimaru M, Kodama R, Nambo Y, Watanabe G, Taya K. Influence of exercise and emotional stresses on secretion of prolactin and growth hormone in Thoroughbred horses. J. Equine Sci. 2021;32:49–53.
- Assenza A, Arfuso F, Fazio F, Giannetto C, Rizzo M, Zumbo A, Piccione G. Effect of gender and jumping exercise on leukocyte number, dopamine and prolactin levels in horses. Thai J. Vet. Med. 2018;48:95–101.
- Bachman E, Feng R, Travison T, Li M, Olbina G, Ostland V, Ulloor J, Zhang A, Basaria S, Ganz T. Testosterone suppresses hepcidin in men: A potential mechanism for testosterone-induced erythrocytosis. J. Clin. Endocrinol. Metab. 2010;95:4743–4747.
- Guo W, Bachman E, Li M, Roy C.N, Blusztajn J, Wong S, Chan S.Y, Serra C, Jasuja R, Travison T.G. Testosterone administration inhibits hepcidin transcription and is associated with increased iron incorporation into red blood cells. Aging Cell 2013;12:280–291.
- Latour C, Kautz L, Besson-Fournier C, Island M.L, Canonne-Hergaux F, Loréal O, Ganz T, Coppin H, Roth M.P. Testosterone perturbs systemic iron balance through activation of epidermal growth factor receptor signaling in the liver and repression of hepcidin. Hepatology 2014;59:683–694.
- Bachman E, Travison T.G, Basaria S, Davda M.N, Guo W, Li M, Connor Westfall J, Bae H, Gordeuk V, Bhasin S. Testosterone induces erythrocytosis via increased erythropoietin and suppressed hepcidin: Evidence for a new erythropoietin/hemoglobin set point. J. Gerontol. A Biol. Sci. Med. Sci. 2014;69:725–735.
- Neuberg-Zuchowicz K, Oedenberg H. Changes in hematological parameters of show jumping horses during yearly training cycle. Med. Weter. 2011;67:765–769.
- Czech A, Kiesz M, Kiesz A, Próchniak T, Różański P, Klimiuk K. Influence of Type of Use, Age and Gender on Haematological and Biochemical Blood Parameters of Małopolski Horses. Ann. Anim. Sci. 2019;19:85–96.
- Dąbrowska I, Grzędzicka J, Malin K, Pawliński B, Mickiewicz J, Witkowska-Piłaszewicz O. Intense Leisure Exploitation Influences on Horses Hormonal Reaction—Preliminary Study. Agriculture 2022;12:1777.
- Grzędzicka J, Dąbrowska I, Malin K, Witkowska-Piłaszewicz O. Exercise-related changes in the anabolic index (testosterone to cortisol ratio) and serum amyloid A concentration in endurance and racehorses at different fitness levels. Front. Vet. Sci. 2023;10:1148990.
- Yang Q, Jian J, Katz S, Abramson S.B, Huang X. 17β-Estradiol inhibits iron hormone hepcidin through an estrogen responsive element half-site. Endocrinology 2012;153:3170–3178.
- Hou Y, Zhang S, Wang L, Li J, Qu G, He J, Rong H, Ji H, Liu S. Estrogen regulates iron homeostasis through governing hepatic hepcidin expression via an estrogen response element. Gene 2012;511:398–403.
- Alfaro-Magallanes V.M, Barba-Moreno L, Romero-Parra N, Rael B, Benito P.J, Swinkels D.W, Laarakkers C.M, Díaz Á.E, Peinado A.B, IronFEMME Study Group. Menstrual cycle affects iron homeostasis and hepcidin following interval running exercise in endurance-trained women. Eur. J. Appl. Physiol. 2022;122:2683–2694.
- Satué K, Fazio E, La Fauci D, Medica P. Changes of Hepcidin, Ferritin and Iron Levels in Cycling Purebred Spanish Mares. Animals 2023;13:1229.
- Li X, Rhee D.K, Malhotra R, Mayeur C, Hurst L.A, Ager E, Shelton G, Kramer Y, McCulloh D, Keefe D. Progesterone receptor membrane component-1 regulates hepcidin biosynthesis. J. Clin. Investig. 2016;126:389–401.
- Wideman L, Weltman J.Y, Hartman M.L, Veldhuis J.D, Weltman A. Growth hormone release during acute and chronic aerobic and resistance exercise: Recent findings. Sports Med. 2002;32:987–1004.
- Vigas M, Celko J, Koska J. Role of body temperature in exercise-induced growth hormone and prolactin release in non-trained and physically fit subjects. Endocr. Regul. 2000;34:175–180.
- Roemmich J.N, Rogol A.D. Exercise and growth hormone: Does one affect the other? Pt 2. J. Pediatr. 1997;131:S75–S80.
- Troutt J.S, Rudling M, Persson L, Ståhle L, Angelin B, Butterfield A.M, Schade A.E, Cao G, Konrad R.J. Circulating human hepcidin-25 concentrations display a diurnal rhythm, increase with prolonged fasting, and are reduced by growth hormone administration. Clin. Chem. 2012;58:1225–1232.
- Krygier A, Szczepanek-Parulska E, Cieślewicz M, Wrotkowska E, Chanaj-Kaczmarek J, Ruchała M. Iron Homeostasis and Hepcidin Concentration in Patients With Acromegaly. Front. Endocrinol. 2022;12:788247.
- Goodnough J.B, Ramos E, Nemeth E, Ganz T. Inhibition of hepcidin transcription by growth factors. Hepatology 2012;56:291–299.
- Solberg A, Reikvam H. Iron Status and Physical Performance in Athletes. Life 2023;13:2007.
- Fallon K.E. Utility of hematological and iron-related screening in elite athletes. Clin. J. Sport Med. 2004;14:145–152.
- DellaValle D.M, Haas J.D. Iron supplementation improves energetic efficiency in iron-depleted female rowers. Med. Sci. Sports Exerc. 2014;46:1204–1215.
- McKay A.K.A, Sim M, Moretti D, Hall R, Stellingwerff T, Burden R.J, Peeling P. Methodological Considerations for Investigating Iron Status and Regulation in Exercise and Sport Science Studies. Int. J. Sport Nutr. Exerc. Metab. 2022;32:359–370.
- Satué K, Fazio E, La Fauci D, Medica P. Hematological indexes and iron status in pregnant mares. Arch. Anim. Breed. 2023;66:197–205.
- Animal Health Diagnostic Center. [(accessed on 7 January 2024)]. Available online: https://www.vet.cornell.edu/animal-health-diagnostic-center/laboratories/clinical-pathology/reference-intervals/chemistry.
- Burlikowska K, Bogusławska-Tryk M, Szymeczko R, Piotrowska A. Haematological and biochemical blood parameters in horses used for sport and recreation. J. Cent. Eur. Agric. 2015;16:370–382.
- Mills P.C, Smith N.C, Casas I, Harris P, Harris R.C, Marlin D.J. Effects of exercise intensity and environmental stress on indices of oxidative stress and iron homeostasis during exercise in the horse. Eur. J. Appl. Physiol. Occup. Physiol. 1996;74:60–66.
- Bollinger L, Bartel A, Weber C, Gehlen H. Pre-Ride Biomarkers and Endurance Horse Welfare: Analyzing the Impact of the Elimination of Superoxide Dismutase, δ-Aminolevulinic-Dehydratase, Thiobarbituric Acid Reactive Substances, Iron, and Serum Amyloid A Levels in Elite 160 km Endurance Rides. Animals 2023;13:1670.
- Hyyppä S, Höyhtyä M, Nevalainen M, Pösö A.R. Effect of exercise on plasma ferritin concentrations: Implications for the measurement of iron status. Equine Vet. J. Suppl. 2002;34:186–190.
- Assenza A, Congiu F, Giannetto C, Fazio F, Piccione G. Serum iron, ferritin, transferrin and haptoglobin concentration variations during repeated show jumping competition in horse. Acta Vet. Brno. 2017;85:343–347.
- Piccione G, Rizzo M, Arfuso F, Bruschetta D, Giudice E, Assenza A. Iron Metabolism Modification During Repeated Show Jumping Event in Equine Athletes. Ann. Anim. Sci. 2017;17:197–204.
- Abramovitc G, Parra A.C, Fernandes W.R. Changes in iron levels, total iron binding capacity, transferrin saturation in race horses, before and after of physical exercise. Braz. J. Vet. Med. 2014;36:289–293.
- Assenza A, Casella S, Giannetto C, Fazio F, Tosto F, Piccione G. Iron profile in Thoroughbreds during a standard training program. Aust. Vet. J. 2016;94:60–63.
- Inoue Y, Osawa T, Matsui A, Asai Y, Murakami Y, Matsui T, Yano H. Changes of Serum Mineral Concentrations in Horses during Exercise. Anim. Biosci. 2002;15:531–536.
- Ohira Y, Kariya F, Yasui W, Sugawara S, Koyanagi K, Kaihatsu K, Inoue N, Hirata F, Chen C, Ohno H. Physical exercise and iron metabolism. 1995. pp. 5–12.
- Allen K.J, van Erck-Westergren E, Franklin S.H. Exercise Testing in the Equine Athlete. Equine Vet. Educ. 2016;28:89–98.
- Hoes M.F, Grote Beverborg N, Kijlstra J.D, Kuipers J, Swinkels D.W, Giepmans B.N.G, Rodenburg R.J, van Veldhuisen D.J, de Boer R.A, van der Meer P. Iron deficiency impairs contractility of human cardiomyocytes through decreased mitochondrial function. Eur. J. Heart Fail. 2018;20:910–919.
- Theelen M.J.P, Beukers M, Grinwis G.C.M, Sloet van Oldruitenborgh-Oosterbaan M.M. Chronic iron overload causing haemochromatosis and hepatopathy in 21 horses and one donkey. Equine Vet. J. 2019;51:304–309.
- Pearson E.G, Andreasen C.B. Effect of oral administration of excessive iron in adult ponies. J. Am. Vet. Med. Assoc. 2001;218:400–404.
- McKeever K.H, Agans J.M, Geiser S, Lorimer P.J, Maylin G.A. Low dose exogenous erythropoietin elicits an ergogenic effect in standardbred horses. Equine Vet. J. Suppl. 2006;36:233–238.
- McKeever K.H, Agans J.M, Geiser S, Scali R, Guirnalda P.D, Kearns C.F, Lorimer P.J. Effect of recombinant human erythropoietin administration on red cell volume, aerobic capacity and indices of performance in standardbred horses; Proceedings of the 16th Equine Nutrition and Physiology Symposium; Raleigh, NC, USA. 2–5 June 1999; pp. 163–164. .
- Wickler S.J, Greene H.M. High altitude acclimatization and athletic performance in horses. Equine Comp. Exerc. Physiol. 2004;1:167–170.
- Moerman W. Master’s Thesis. Ghent Ghent University; Ghent, Belgium: 2018. A Critical View on Hypoxia Training: Horse Versus Human. .
- Lewis L.D, Knight A, Lewis B. Equine Clinical Nutrition: Feedings and Care. .
- Auer D.E, Ng J.C, Thompson H.L, Inglis S, Seawright A.A. Acute phase response in horses: Changes in plasma cation concentrations after localised tissue injury. Vet. Rec. 1989;124:235–239.
- Fleming K.A, Barton M.H, Latimer K.S. Iron deficiency anemia in a neonatal foal. J. Vet. Intern. Med. 2006;20:1495–1498.
- Smith J.E, Cipriano J.E. Inflammation-induced changes in serum iron analytes and ceruloplasmin of Shetland ponies. Vet. Pathol. 1987;24:354–356.
- Borges A.S, Divers T.J, Stokol T, Mohammed O.H. Serum iron and plasma fibrinogen concentrations as indicators of systemic inflammatory diseases in horses. J. Vet. Intern. Med. 2007;21:489–494.
- Piccione G, Casella S, Giannetto C, Messina V, Monteverde V, Caola G, Guttadauro S. Haematological and haematochemical responses to training and competition in standardbred horses. Comp. Clin. Pathol. 2010;19:95–101.
- Wood S.C, Fedde M.R. Effects of racing and gender on viscoelastic properties of horse blood. Respir. Physiol. 1997;107:165–172.
- Hassan H, Aly M, ELseady Y, Nayel M, Elsify A, Salama A, Hassan M, Elbarody E, Kamar A. The Effect of Race in the Clinical, Hematological and Biochemical Biomarkers in Thoroughbred Horses. Alex. J. Vet. Sci. 2015;46:161–169.
- Maśko M, Domino M, Jasiński T, Witkowska-Piłaszewicz O. The Physical Activity-Dependent Hematological and Biochemical Changes in School Horses in Comparison to Blood Profiles in Endurance and Race Horses. Animals 2021;11:1128.
- Hinchcliff K.W, Kaneps A.J, Geor R.J. Equine Sports Medicine and Surgery: Basic and Clinical Sciences of the Equine Athlete. 2nd ed.. .
- Weiss D.J, Wardrop K.J. Schalm’s Veterinary Hematology. 6th ed.. .
- Padalino B, Rubino G, Lacinio R, Petazzi F. A New Classification to Diagnose Type of Anemia in Standardbred Horses: A Retrospective Study. JEVS 2016;44:21–25.
- Kellon E.M. Equine Anaemia—It’s NOT About Iron Deficiency. Forageplus Talk. [(accessed on 28 May 2025)]. .
- Schryver H.F. Mineral and vitamin intoxication in horses. Vet. Clin. N. Am. Equine Pract. 1990;6:295–318.
- Rose R.J, Allen J.R. Hematologic responses to exercise and training. Vet. Clin. N. Am. Equine Pract. 1985;1:461–476.