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See detailPhysiological response to the cross country phase in eventing horses
Amory, Hélène ULg; Art, Tatiana ULg; Linden, Annick ULg et al

in Journal of Equine Veterinary Science (1993), 13

Blood samples were collected for lactate concentration determination (Lacc) at the arrival of the cross-country phase from 40 horses of various class levels competing in 6 different three-day events ... [more ▼]

Blood samples were collected for lactate concentration determination (Lacc) at the arrival of the cross-country phase from 40 horses of various class levels competing in 6 different three-day events. Moreover, in 8 horses, heart rate (HR) was recorded every 5 seconds during the cross-country. Among them, 5 horses were submitted, at the beginning of the competition's season to a standardized exercise test (SET) on a track which allowed us to study the relationship between HR, blood lactate concentration and running speed on flat ground in these horses. The relationship between mean HR and mean speed, between Lacc and mean speed and between Lacc and HR during the cross-country were studied using regression analysis. Mean HR during the cross-country was linearly related to mean speed during this phase (r=0.87, p ≤ 0.01), but this relationship was shifted upwards in comparison with the corresponding curve obtained during the SET (r=0.97, p ≤ 0.001). In the same way, the relationship between Lacc and mean speed during the cross-country was exponential (r=0.93, p ≤ 0.001), but blood lactate accumulation occurred at a lower speed than during the SET (r=0.94, p ≤ 0.001). The correlation between Lacc and HR was stronger when Lacc was related to HR during the 15 last minutes of the cross (r = 0.84) than to mean HR during the whole cross (r = 0.75) or to HR during the 2 last (r = 0.74) or the last (r = 0.80) minute of the course, which indicated that continuous recording of HR allowed a more accurate estimation of the severity of exercise performed during the cross-country than Lacc. Heart rate ranged from 170 to 190 beats/min during the first part of the cross-country and reached or exceeded values of 190 to 200 beats/min at the end of the course. Therefore, the anaerobic threshold is reached during cross-country. Recruitment of anaerobic me tabolism at the end of the course was otherwise demonstrated by the high values of Lacc. These aerobic-anaerobic meta bolic requirements should be taken into account to design the training program of an eventing horse. [less ▲]

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See detailEffect of a Booster Vaccination against Influenza and Equine Herpes Virus on Cardio-Respiratory Adjustments to Strenuous Exercise and Training in Thoroughbred Horses
Art, Tatiana ULg; Lekeux, Pierre ULg

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1993), 40(7), 481-491

This study was conducted in order to assess whether exercise- and training-induced cardio-respiratory adjustments are modified during the 10-day period which follows a booster vaccination with an oily ... [more ▼]

This study was conducted in order to assess whether exercise- and training-induced cardio-respiratory adjustments are modified during the 10-day period which follows a booster vaccination with an oily adjuvanted inactivated vaccine against influenza and equine herpesvirus-1 (Equiffa). Nine healthy vaccinated thoroughbred horses were used. Six were revaccinated and three were kept as control. All the horses completed a standardised exercise test (SET) that was repeated 4 times, i.e. 10 (SET1) and 2 (SET2) days before revaccination, and 2 (SET3) and 10 (SET4) days after revaccination. During the whole experimental period the horses were trained 6 days per week according to an interval training schedule. Respiratory airflow, tidal volume, respiratory rate and expired minute volume (VE) were measured using a face mask and 2 ultra-sonic pneumotachographs. The oxygen uptake (VO2) and carbon dioxide production (VCO2) were obtained on a breath-by-breath basis, using a mass spectrometer. Heart rate (HR) was continuously measured with a polar horse tester. Venous blood was sampled before and after the test and analysed for biochemical determinations. Blood was also sampled before and 21 days after the booster vaccination for circulating antibody titration. The peak VO2, VCO2, ventilatory equivalent (VE/VO2) and oxygen pulse (VO2/HR) were significantly improved by the 3-week training period. The other cardio-respiratory parameters as well as most of the blood parameters remained unchanged throughout the 4 SETs. The revaccination did not impair any of the parameters measured before, during, or after the SETs. All revaccinated horses showed a rise in antibodies against influenza virus type A1 and A2 and EVH-1 compared to the control horses. It was concluded that, in our horses, revaccination with an oily adjuvanted inactivated vaccine against influenza and EVH-1 did not impair their cardiorespiratory and metabolic adjustments to strenuous exercise and intense training, and that the seroconversion due to revaccination was unaffected by the intense daily exercise experienced by the animals in the post-vaccination period [less ▲]

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See detailTraining-Induced Modifications in Cardiorespiratory and Ventilatory Measurements in Thoroughbred Horses
Art, Tatiana ULg; Lekeux, Pierre ULg

in Equine Veterinary Journal (1993), 25(6), 532-536

The effects of training and detraining on ventilation during a standardised exercise test were investigated. Ten healthy Thoroughbred horses underwent 5 standardised treadmill exercise tests (SET): SET1 ... [more ▼]

The effects of training and detraining on ventilation during a standardised exercise test were investigated. Ten healthy Thoroughbred horses underwent 5 standardised treadmill exercise tests (SET): SET1, at the start of the experimental period; SET2, after 3 weeks acclimatisation; SET3, after 3 week of aerobic training; SET4 after 3 weeks of anaerobic (i.e. interval) training; and SET5, after 3 weeks of detraining. The SETs were carried out in an air-conditioned laboratory on a treadmill inclined at 6 degrees. Respiratory airflow, tidal volume (VT), respiratory frequency (RF) and expired minute volume (VE) were obtained using a face mask and 2 ultrasonic pneumotachographs. Peak oxygen uptake (VO2 peak) and carbon dioxide production (VCO2 peak) values were calculated on a breath-by-breath basis, using a mass spectrometer. Heart rate (HR) was continuously measured with a polar horse tester. Oxygen pulse (VO2/HR) and ventilatory equivalent for O2 were calculated from the collected data. Venous blood was sampled before and after the SET for lactate, pH and haemoglobin determinations. The results indicated that trained horses showed significant modifications of all values, except VT, RF and VE. This study suggests that, in horses, the increase in VO2 induced by training seems to be mainly due to cardiovascular and haematological changes rather than to ventilatory changes. Consequently, while all the other systems implicated in exercise physiology can be efficiently improved and trained, the ventilatory capacity has only limited ability to adapt to training [less ▲]

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See detailAérosolthérapie chez le cheval : 3. Etude clinique
Lekeux, Pierre ULg; Genicot, Bruno; Votion, Dominique ULg et al

in Pratique Vétérinaire Equine (1993), 25(4), 245-248

This review analyzes the advantages, disadvantages, limites and clinical applications of aerosoltherapy in equine medicine

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See detailAérosolthérapie chez le cheval : 1. Etude technique
Lekeux, Pierre ULg; Genicot, Bruno; Votion, Dominique ULg et al

in Pratique Vétérinaire Equine (1993), 25(4), 225-232

This review describes the principle of action of the different types of nebulizers in the horse and analyzes the technical and methodological requirements for an optimal use of aerosoltherapy in this ... [more ▼]

This review describes the principle of action of the different types of nebulizers in the horse and analyzes the technical and methodological requirements for an optimal use of aerosoltherapy in this species [less ▲]

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See detailMechanics of breathing in resting and exercising animals
Lekeux, Pierre ULg; Art, Tatiana ULg

in Lekeux, Pierre (Ed.) Pulmonary Function in Healthy, Exercising and Diseased Animals (1993)

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See detailGas exchange in resting and exercising animals
Lekeux, Pierre ULg; Art, Tatiana ULg

in Lekeux, Pierre (Ed.) Pulmonary Function in Healthy, Exercising and Diseased Animals (1993)

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See detailControl of breathing in resting and exercising animals
Lekeux, Pierre ULg; Rollin, Frédéric ULg; Art, Tatiana ULg

in Lekeux, Pierre (Ed.) Pulmonary Function in Healthy, Exercising and Diseased Animals (1993)

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See detailFunctional effects of obstructive pulmonary diseases
Lekeux, Pierre ULg; Clercx, Cécile ULg; Art, Tatiana ULg

in Lekeux, Pierre (Ed.) Pulmonary Function in Healthy, Exercising and Diseased Animals (1993)

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See detailFunctional effects of vascular pulmonary diseases
Lekeux, Pierre ULg; Clercx, Cécile ULg; Art, Tatiana ULg

in Lekeux, Pierre (Ed.) Pulmonary Function in Healthy, Exercising and Diseased Animals (1993)

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See detailEffect of exercise on equine alveolar ventilation
Lekeux, Pierre ULg; Art, Tatiana ULg; Desmecht, Daniel ULg

in Proceedings of the Eleventh Veterinary Respiratory Symposium, Champaign, Illinois (1992, September 27)

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See detailInfluence of training on ventilatory and cardio-respiratory parameters measured during a standardised exercise in thoroughbred horses
Art, Tatiana ULg; Votion, Dominique ULg; Mc Entee, K et al

in Proceedings of the 11th Comparative Respiratory Society Meeting (1992)

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See detailTraining-induced changes in cardio-respiratory parameters during a standardised exercise in thoroughbred horses
Art, Tatiana ULg; Votion, Dominique ULg; Mc Entee, K et al

in Archives Internationales de Physiologie et de Biochimie (1992)

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See detailQuantitative Buffy Coat Analysis Related to Adrenocortical Function in Horses During a Three-Day Event Competition
Linden, Annick ULg; Art, Tatiana ULg; Amory, Hélène ULg et al

in Zentralblatt für Veterinarmedizin. Reihe A (1991), 38(5), 376-82

This study was carried out to investigate stress induced in a cross-country by measuring plasma cortisol and to compare the changes in cortisol level with the leucocytic changes measured with the ... [more ▼]

This study was carried out to investigate stress induced in a cross-country by measuring plasma cortisol and to compare the changes in cortisol level with the leucocytic changes measured with the quantitative buffy coat (QBC) analysis, which is a new method applicable in field conditions for the evaluation of haematological parameters in horses. Seven healthy horses competing in a national three-day event were investigated. Venous blood was sampled under resting condition, 2 min and 180 min after the completion of the cross-country and analysed for haematological parameters, plasma cortisol, protein and lactate levels. Immediately after the event, there was a significant increase in all values except in the granulocytes (Gr) to lymphocytes-monocytes (LM) ratio. 180 min after the event, all the parameters returned to their resting levels while white blood cells (WBC), Gr and Gr/LM ratio were significantly higher with respect to their resting values. A high correlation (r = 0.82) was found between the relative increase in plasma cortisol levels 2 min after exercise and the relative increase in Gr/LM 180 min after exercise. Therefore it was concluded that the Gr/LM ratio measured 180 min after exercise with the QBC analysis is a reliable index to estimate the plasma cortisol levels measured 2 min after exercise. This new technique could consequently be used in order to evaluate, in field conditions, the exercise-induced stress. [less ▲]

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See detailPotentialités de l'application de l'oxymétrie à infra-rouge basée sur la pulsation dans l'espèce canine
Lemaire, M.; Art, Tatiana ULg; Henroteaux, Marc ULg et al

in Annales de Médecine Vétérinaire (1991), 135

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See detailEtude de la mécanique ventilatoire en tant que facteur limitant de la ventilation au cours de l'effort chez les équidés
Art, Tatiana ULg

Thèse d’agrégation de l’enseignement supérieur (1991)

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See detailEffect of 5 different types of exercise, transportation and ACTH administration on plasma cortisol concentration in sports horses.
Linden, Annick ULg; Art, Tatiana ULg; Amory, Hélène ULg et al

in Persson, S. G. B.; Jeffcott, L. B.; Lindholm, A. (Eds.) Equine Exercise Physiology III (1991)

This study was carried out to compare the changes in plasma cortisol concentration produced by 5 different types of exercise, transportation and ACTH administration. Venous blood was analysed for cortisol ... [more ▼]

This study was carried out to compare the changes in plasma cortisol concentration produced by 5 different types of exercise, transportation and ACTH administration. Venous blood was analysed for cortisol concentration before and after each stimulus. The types of exercise were show jumping (n=28), cross country phase of a three-day event (n=32), trot race (n=9), gallop race (n = 10) and endurance ride (n=8). The response following the intravenous injection of synthetic ACTH (200 µg) in 6 of the event horses was determined. The ACTH test was carried out one week after competition. In 5 horses, the response to road transport of one hour was studied. All stimuli, except transportation produced a significant increase in plasma cortisol concentration. The endurance ride produced the largest increase and the show jumping the smallest. ACTH administration resulted in a 164% rire in plasma cortisol. Il was concluded that I) the degree of increase in plasma cortisol concentration appeared to reflect both intensity and dotation of workload; endurance ride appeared to be the most exhaustive and show jumping the least; 2) there was a correlation (r2=0.82) between the individual cortisol response to cross country exercise and to exogenous ACTH in the saure horses and 3) there was an important individual effect on transport-induced cortisol changes. [less ▲]

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See detailChanges in leucocyte counts related to adrenocortical function in horses during exercise
Linden, Annick ULg; Art, Tatiana ULg; Amory, Hélène ULg et al

in Archives Internationales de Physiologie et de Biochimie (1991)

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See detailComparison of the effects of a physiological and a pharmacological stress on plasma cortisol in sport horses
Linden, Annick ULg; Art, Tatiana ULg; Amory, Hélène ULg et al

in Archives Internationales de Physiologie et de Biochimie (1991)

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See detailExercise physiology in jumping horses
Art, Tatiana ULg; Amory, Hélène ULg; Desmecht, Daniel ULg et al

in Archives Internationales de Physiologie et de Biochimie (1991)

Detailed reference viewed: 3 (0 ULg)