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Giers J, Bartel A, Kirsch K, Müller SF, Horstmann S, Gehlen H. Blood-based assessment of oxidative stress, inflammation, endocrine and metabolic adaptations in eventing horses accounting for plasma volume shift after exercise. Vet Med Sci 2024; 10:e1409. [PMID: 38516822 PMCID: PMC10958401 DOI: 10.1002/vms3.1409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2024] Open
Abstract
BACKGROUND After submaximal exercise, blood values of eventing horses show physiological reactions. OBJECTIVES This prospective longitudinal study investigated blood parameters in 20 elite eventing horses before and after two-four-star cross-country rides. METHODS Using a mixed model adjusting for plasma volume shift, we assessed exercise-dependent parameters and compared blood values with reference ranges for healthy horses at rest. RESULTS Following exercise, cortisol, triiodothyronine (T3) and thyroxine (T4) showed short-term increases, and superoxide-dismutase showed a small short-term increase. Hepatic values showed short-term (haemoglobin [HGB], globulins) or sustained increases (bilirubin, glutamate dehydrogenase, alanine aminotransferase). Digestion-related parameters showed small short-term increases (α-amylase, triglycerides) or decreases (cholesterol, DGGR-lipase), apparent through plasma shift adjustment. Zinc decreased in the short term, and iron showed a delayed decrease. White blood cell count increased persistently after training, whereas serum amyloid A remained unchanged. CONCLUSIONS Exercised eventing horses had consistently elevated HGB and cortisol levels 10 and 30 min after submaximal exercise, exceeding the reference ranges for healthy horses at rest. Exercise activates the hypothalamic-pituitary-adrenocortical and hypothalamic-pituitary-thyroid axes. Antioxidant activity was observed. Increased energy requirements led to the mobilization of energy reserves, and a sustained increase in liver enzymes indicated hepatocellular injury. Mild haemolysis suggested increased muscle metabolism, whereas signs of inflammation were subtle. Further research is needed to identify which horses deviate from mean values.
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Affiliation(s)
- Johanna Giers
- Equine ClinicInternal MedicineFreie Universität BerlinBerlinGermany
| | - Alexander Bartel
- Institute for Veterinary Epidemiology and BiostatisticsFreie Universität BerlinBerlinGermany
| | - Katharina Kirsch
- Department Sensors and ModelingLeibniz Institute for Agricultural Engineering and Bioeconomy (ATB)PotsdamGermany
| | | | | | - Heidrun Gehlen
- Equine ClinicInternal MedicineFreie Universität BerlinBerlinGermany
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Equine-Assisted Services: an overview of current scientific contributions on efficacy and outcomes on humans and horses. J Vet Behav 2022. [DOI: 10.1016/j.jveb.2022.11.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Pituitary Pars Intermedia Dysfunction (PPID) in Horses. Vet Sci 2022; 9:vetsci9100556. [PMID: 36288169 PMCID: PMC9611634 DOI: 10.3390/vetsci9100556] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 09/25/2022] [Accepted: 10/04/2022] [Indexed: 12/12/2022] Open
Abstract
Substantial morbidity results from pituitary pars intermedia dysfunction (PPID) which is often underestimated by owners and veterinarians. Clinical signs, pathophysiology, diagnostic tests, and treatment protocols of this condition are reviewed. The importance of improved recognition of early clinical signs and diagnosis are highlighted, as initiation of treatment will result in improved quality of life. Future research should be targeted at improving the accuracy of the diagnosis of PPID, as basal adrenocorticotropic hormone (ACTH) concentration can lack sensitivity and thyrotropin releasing hormone (TRH) used to assess ACTH response to TRH stimulation is not commercially available as a sterile registered product in many countries. The relationship between PPID and insulin dysregulation and its association with laminitis, as well as additional management practices and long-term responses to treatment with pergolide also require further investigation.
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Dockalova H, Baholet D, Batik A, Zeman L, Horky P. Effect of Milk Thistle (Silybum marianum) Seed Cakes by Horses Subjected to Physical Exertion. J Equine Vet Sci 2022; 113:103937. [PMID: 35318098 DOI: 10.1016/j.jevs.2022.103937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 03/10/2022] [Accepted: 03/14/2022] [Indexed: 11/20/2022]
Abstract
Milk thistle (Silybum marianum) provides several possible benefits for horses, namely anti-inflammatory, antioxidant effects, hepatoprotective, and neuroprotective effects. Silybin exerts also pronounced effects on energy metabolism, that could be useful for sport horses. The aim of this study is to evaluate the effect of milk thistle seed cakes (in the form of a granulated mixture with barley) on blood biochemical parameters (total protein, albumin, bilirubin, urea, creatinine, ALT, AST, ALP, GGT, LDH, the total cholesterol, HDL-cholesterol, LDL-cholesterol, TAG, BHB, NEFA, creatine kinase, lactate, glucose, glutathione peroxidase, total antioxidant capacity, cortisol, calcium, and phosphorus) to monitor the differences between the experimental (milk thistle in feed) and control horses after exposure of the monitored horses to heavy physical exercise (combined driving) total number of horses was 12 Czech Warmblood breed horses. The digestibility of silymarin (and its individual flavonolignans) and basic nutrients are also monitored in this study. Statistically significant differences (P < .05) were found mainly in plasma cortisol and NEFA levels. The results of this study confirmed the results of our previous studies. These results suggest that the feeding of milk thistle seed cakes has a possible positive effect on horse health and energy metabolism.
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Affiliation(s)
- Hana Dockalova
- Department of Animal Nutrition and Forage Production, Mendel University in Brno, Brno, Czech Republic
| | - Daria Baholet
- Department of Animal Nutrition and Forage Production, Mendel University in Brno, Brno, Czech Republic
| | - Andrej Batik
- Department of Animal Morphology, Physiology and Genetics, Mendel University in Brno, Brno, Czech Republic
| | - Ladislav Zeman
- Department of Animal Nutrition and Forage Production, Mendel University in Brno, Brno, Czech Republic
| | - Pavel Horky
- Department of Animal Nutrition and Forage Production, Mendel University in Brno, Brno, Czech Republic.
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Fazio E, Lindner A, Cravana C, Wegener J, Medica P, Hart-Mann U, Ferlazzo A. Effects of standardized exercise tests on plasma thyroid hormones' kinetics in Standardbred racehorses. J Equine Vet Sci 2021; 110:103853. [PMID: 34968655 DOI: 10.1016/j.jevs.2021.103853] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 12/17/2021] [Accepted: 12/20/2021] [Indexed: 11/26/2022]
Abstract
This study examined how a standard exercise test (SET) affected (1) thyroid hormones (THs) of horses and (2) the relationship between the VLa4 of horses and TH responses to the exercise in trained Standardbred racehorses (VLa4 is the velocity run at defined conditions at which a blood lactate concentration of 4 mmol/L is determined). 12 trained Standardbred racehorses (six stallions and six mares) performed SETs until the horses' blood lactate concentration was at or above 4 mmol/L. The horses were divided into three age groups (2, 3 and 4 years old); each group consists of 4 horses respectively (2 male and 2 female), to evaluate the effects of age and sex on hormonal responses to SET. During each SET, blood samples were taken at rest and after each interval and at the end of SET. Blood was analysed for total and free triiodothyronine (T3, fT3) as well as total and free thyroxine (T4, fT4). The statistical model included three fixed factors (SET, sex and age) and their main interactions. ANOVA analysis revealed that T3 and fT3 were significantly influenced by SETs. Plasma T3 and fT3 concentrations were higher in 4-year-old horses compared to the other age groups. All plasma THs concentrations were higher in mares than in stallions. Correlations revealed that a higher VLa4 was negatively related to all THs responses in 2-year-old Standardbred mares only. The SET used to determine VLa4 increased selected THs (T3, fT3); these increases were inversely related to VLa4 and affected by age and sex of the horses. The correlation of VLa4 with thyroid exercise' response might provide some additional information for performance evaluation of Standardbred racehorses, especially for evaluating training adaptation, according to sex and age. Further studies are necessary to provide support on the value of measuring THs in Standardbred racehorses of different sex and age.
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Affiliation(s)
- Esterina Fazio
- Department of Veterinary Sciences, Veterinary Physiology Unit, Polo Universitario Annunziata, Viale Palatucci 13, 98168 Messina, Italy
| | | | - Cristina Cravana
- Department of Veterinary Sciences, Veterinary Physiology Unit, Polo Universitario Annunziata, Viale Palatucci 13, 98168 Messina, Italy
| | | | - Pietro Medica
- Department of Veterinary Sciences, Veterinary Physiology Unit, Polo Universitario Annunziata, Viale Palatucci 13, 98168 Messina, Italy.
| | - Ulrich Hart-Mann
- Institute of Movement and Training Science; Faculty of Sport Science, 04109 Leipzig, Germany
| | - Adriana Ferlazzo
- Department of Veterinary Sciences, Veterinary Physiology Unit, Polo Universitario Annunziata, Viale Palatucci 13, 98168 Messina, Italy
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Cravana C, Fazio E, Ferlazzo A, Medica P. Therapeutic Riding Horses: using a hypothalamic-pituitary-adrenal axis measure to assess the physiological stress response to different riders. J Vet Behav 2021. [DOI: 10.1016/j.jveb.2021.07.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Weight of the thyroid, adrenal glands, and the liver of white rats in the conditions of hyperthyroidism: the possibility of applying indices changes as screening-markers for determining body status effected by organic and inorganic iodine. MEDICNI PERSPEKTIVI (MEDICAL PERSPECTIVES) 2020. [DOI: 10.26641/2307-0404.2020.2.206793] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Ferlazzo A, Cravana C, Fazio E, Medica P. The different hormonal system during exercise stress coping in horses. Vet World 2020; 13:847-859. [PMID: 32636578 PMCID: PMC7311877 DOI: 10.14202/vetworld.2020.847-859] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 04/03/2020] [Indexed: 12/19/2022] Open
Abstract
The review discusses the hormonal changes during exercise stress. The exercise generally produces a rise of adrenaline (A), noradrenaline (NA), adrenocorticotropic hormone (ACTH), cortisol, glucagon, growth hormone, arginine vasopressine, etc., and a drop of insulin. The hormonal events during reestablishment of homeostasis due to exercise stress can be divided into a catabolic phase, with decreased tolerance of effort, and reversible biochemical, hormonal and immunological changes, and an anabolic phase, with a higher adaptive capacity, and enhanced performance. The two main hormonal axes activated in the catabolic phase are sympathetic–adrenal–medullary system and hypothalamic-pituitary-adrenal (HPA) axis, while in the anabolic phase, growth hormone-insulin-like factor I axis, and gonadal axes. The hormonal responses during exercise and recovery can be regarded as regulatory and integrated endocrine responses. The increase of catecholamines and ACTH is dependent on the intensity of exercise; a marked increase in plasma A occurs during exercises with high emotional content. The response of cortisol is correlated with the duration of exercise, while the effect of exercise duration on b-endorphin changes is highly dependent on the type of exercise performed. Cortisol and b-endorphin changes usually occur in phase, but not during exercises with high emotional content. Glucocorticoids and iodothyronines are involved in meeting immediate energy demands, and a model of functional interactions between HPA axis and hypothalamic-pituitary-thyroid axis during exercise stress is proposed. A modulation of coping responses to different energy demanding physical activities required for sport activities could be hypothesized. This review supports the proposed regulation of hypophysiotropic TRHergic neurons as metabolic integrators during exercise stress. Many hormonal systems (ghrelin, leptin, glucose, insulin, and cortisol) are activated to control substrate mobilizations and utilization. The cardiovascular homeostasis, the fluid and electrolyte balance during exercise are highly dependent on vasoactive hormones (antidiuretic hormone, atrial natriuretic peptide, renin–angiotensin–aldosterone, and prostaglandins) control.
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Affiliation(s)
- Adriana Ferlazzo
- Department of Veterinary Sciences, Unit of Veterinary Physiology, Polo Universitario Annunziata, Messina University, 98168 Messina, Italy
| | - Cristina Cravana
- Department of Veterinary Sciences, Unit of Veterinary Physiology, Polo Universitario Annunziata, Messina University, 98168 Messina, Italy
| | - Esterina Fazio
- Department of Veterinary Sciences, Unit of Veterinary Physiology, Polo Universitario Annunziata, Messina University, 98168 Messina, Italy
| | - Pietro Medica
- Department of Veterinary Sciences, Unit of Veterinary Physiology, Polo Universitario Annunziata, Messina University, 98168 Messina, Italy
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Medica P, Giunta RP, Bruschetta G, Ferlazzo AM. The Influence of Training and Simulated Race on Horse Plasma Serotonin Levels. J Equine Vet Sci 2019; 84:102818. [PMID: 31864456 DOI: 10.1016/j.jevs.2019.102818] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 07/19/2019] [Accepted: 10/17/2019] [Indexed: 12/22/2022]
Abstract
Exercise represents a physical stress that challenges homeostasis affecting central and peripheral serotoninergic systems. The influence of the exercise on circulating serotonin (5-hydroxytryptamine [5-HT]) levels depends on training state as well as the exercise protocol. The purpose of the present research was to determine changes of plasma 5-HT in sport horses in response to training (T) and simulated race (SR) and in addition to assess the possible presence of significant differences on circulating 5-HT between two different sessions of exercise. In particular, the research was carried out on 18 trained horses performing daily training and race activity. Plasma 5-HT levels were analyzed in platelet poor plasma fraction by ELISA assay at T0 (before exercise), T1 (30 minutes after exercise) and T2 (2 hours after exercise). The hypothesis was that both exercise sessions could affect plasma 5-HT levels. Results showed a significant increase of plasma 5-HT levels at T1, compared with T0, both after simulated race and training activity. These effects are probably related to an increased 5-HT release from platelets and/or an increased peripheral 5-HT synthesis induced from exercise. At T2, plasma 5-HT concentrations showed a significant decrease to physiological levels in both sessions. Moreover, plasma 5-HT levels at T1 (SR) were significantly higher than those at T1 (T). Targeting peripheral 5-HT could be useful to assess the physiological adaptability of horses to the exercise, together with other selection techniques of sport horses.
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Affiliation(s)
- Pietro Medica
- Department of Veterinary Sciences, Physiology Unit, University of Messina, Polo Universitario dell'Annunziata, Messina, Italy
| | - Renato Paolo Giunta
- Italian National Reference Center for Toxoplasmosis (Ce.Tox) - Experimental Zooprophylactic Institute (IZS), Catania, Italy
| | - Giuseppe Bruschetta
- Department of Veterinary Sciences, Biochemistry Unit, University of Messina, Polo Universitario dell'Annunziata, Messina, Italy
| | - Alida Maria Ferlazzo
- Department of Veterinary Sciences, Biochemistry Unit, University of Messina, Polo Universitario dell'Annunziata, Messina, Italy.
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