References of "Art, Tatiana"
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See detailSynchronization of Locomotion and Respiration in Trotting Ponies
Art, Tatiana ULg; Desmecht, Daniel ULg; Amory, Hélène ULg et al

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1990), 37(2), 95-103

The aim of the present experiment was to investigate the hypothesis that there is a respiration-locomotion coupling in trotting equines. Therefore the respiratory airflow (V), the gastric pressure (Pga ... [more ▼]

The aim of the present experiment was to investigate the hypothesis that there is a respiration-locomotion coupling in trotting equines. Therefore the respiratory airflow (V), the gastric pressure (Pga) and pleural pressure (Ppl) changes and the step frequency (SF) were simultaneously recorded in 5 trotting ponies (body weight: 255 +/- 15 kg; age: 3.5 +/- 0.4 years). Airflow was measured using a Fleisch pneumotachograph fixed on a face mask. Esophageal and gastric balloon catheters coupled to pressure transducers allowed the recording of Ppl and Pga. The exercise was performed on a treadmill and consisted of 1 min walking (1.5 m.s-1), 1 min slow trotting (3.0 m.s-1)(Trot 1) and 3 min fast trotting (3.5 m.s-1)(Trot 2). Data were continuously recorded before and during exercise. At walk and Trot 1, none of the ponies displayed a coupling between SF and the respiratory frequency (RF). In one pony, SF and RF were coupled at a constant ratio of 2:1 during Trot 2 while two other ponies displayed the same coupling only up to the second minute of Trot 2. In the two last ponies, a coupling occurred at the third minute of Trot 2. In all ponies, the peaks in Pga occurring during expiration occurred always simultaneously with the first and/or the second peak V, whether or not there was a relationship between SF and RF. On the other hand, when SF and RF were coupled, the first part of inspiration was always simultaneous to a decrease in Pga. It was concluded that in trotting ponies respiration and locomotion are not always independent and that the abdominal piston may act in synergy with the respiratory pump in some phases of the breathing cycle [less ▲]

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See detailA Field Study of Post-Exercise Values of Blood Biochemical Constituents in Jumping Horses: Relationship with Score, Individual and Event
Art, Tatiana ULg; Desmecht, Daniel ULg; Amory, Hélène ULg et al

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1990), 37(3), 231-239

The variability of the post-exercise values (PEV) of blood lactate and of some other blood constituents were studied in 8 healthy and fit jumpers through 5 national competitions of equal difficulty. The ... [more ▼]

The variability of the post-exercise values (PEV) of blood lactate and of some other blood constituents were studied in 8 healthy and fit jumpers through 5 national competitions of equal difficulty. The effects of factors such as the individual, performance and competition on these PEV were analysed. Venous blood was sampled immediately after the 5 show-jumping contests and was analysed for packed cell volume (PCV), blood lactate, blood glucose (GLU), total plasma protein (TPP), bicarbonate (HCO3-), sodium (Na+), potassium (K+), chloride (Cl-), calcium (Ca2+), serum activities of lactate dehydrogenase (LDH), creatine phosphokinase (CPK), glutamic-oxalacetic transminase (GOT) and gamma glutamyl transferase (gamma GT). PEV of these 13 blood parameters were analysed using a fixed linear model which included the effect of horse, score and competition and their respective interactions. The analysis of the influence of each of the 3 fixed variables showed that (1) there was no relationship between the PEV variations and the score; (2) there were significant (P less than 0.05) variations induced by the competition in Na+, Ca2+, TPP, LDH and GLU, and (3) there were significant interindividual variations as regards Ca2+, TPP, CPK, gamma GT and PCV with P less than 0.05, LDH with P less than 0.01 and blood lactate with P less than 0.001.(ABSTRACT TRUNCATED AT 250 WORDS) [less ▲]

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See detailVentilatory Mechanics in Healthy Calves During Helium-Oxygen Breathing
Rodriguez, M. N.; Art, Tatiana ULg; Rollin, Frédéric ULg et al

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1990), 37(4), 241-246

The mechanics of breathing was investigated in six healthy calves breathing either air or a mixture of 79% helium and 21% oxygen (He-O2). Intrapleural pressure (Ppl) was measured with an esophageal ... [more ▼]

The mechanics of breathing was investigated in six healthy calves breathing either air or a mixture of 79% helium and 21% oxygen (He-O2). Intrapleural pressure (Ppl) was measured with an esophageal balloon catheter and transpulmonary pressure was obtained by subtracting the mouth pressure (Pm) from Ppl. Respiratory airflow (V) was measured using a Fleisch pneumotachograph N degrees 3 and tidal volume (Vt) was electronically derived by integrating V with respect to time. Respiratory airflow, Vt, Ppl and Pm were simultaneously recorded while the calves breathed first air (1 min), secondly He-O2 (1 min) and finally air again (1 min). The pulmonary function values were calculated on the tracings and the He-O2 values were compared to the corresponding "air" values. The ventilatory response to resistance unloading was characterized by a significant increase in minute volume exclusively due to an increase in respiratory frequency, while Vt remained unchanged. A decrease of 32% in the total pulmonary resistance (RL) and 16% in the work per litre of ventilation (Wrm/l) were observed when calves breathed He-O2. The effect of the He-O2 on RL and on Wrm/l suggests that, in the bovine species, airflow turbulances in the upper part of the respiratory tract play a significant role in the total airways resistance. [less ▲]

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See detailVentilatory response to helium-oxygen breathing in exercising ponies
Art, Tatiana ULg; Lekeux, Pierre ULg

in Archives Internationales de Physiologie et de Biochimie (1989), 97(3), 40

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See detailPulmonary response to intravenous 5-hydroxytryptamine in the healthy calf
Desmecht, Daniel ULg; Rollin, Frédéric ULg; Amory, Hélène ULg et al

in Proceedings of the 8th Comparative Respiratory Society Meeting (1989)

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See detailAerosol serotoninergic responses in respiratory mechanics of healthy calves
Desmecht, Daniel ULg; Rollin, Frédéric ULg; Amory, Hélène ULg et al

in Proceedings of the 8th Comparative Respiratory Society Meeting (1989)

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See detailMechanics of breathing and ventilatory drive in double-muscled calves during acute hypoxia
Rollin, Frédéric ULg; Amory, Hélène ULg; Desmecht, Daniel ULg et al

in Proceedings of the 8th Comparative Respiratory Society Meeting (1989)

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See detailDirect measurement of static chest wall compliance in unsedated calves
Desmecht, Daniel ULg; Rollin, Frédéric ULg; Amory, Hélène ULg et al

in Proceedings of the 8th Comparative Respiratory Society Meeting (1989)

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See detailEffect of acute hypoxia on the bovine ventilatory mechanics
Rollin, Frédéric ULg; Amory, Hélène ULg; Desmecht, Daniel ULg et al

in Archives Internationales de Physiologie et de Biochimie (1989)

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See detailMeasurement of pulmonary inertance in Equids
Art, Tatiana ULg; Lekeux, Pierre ULg; Gustin, Pascal ULg et al

in European Respiratory Journal (1989), 2

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See detailMaximal diaphragmatic strength measurement in healthy unsedated calves
Desmecht, Daniel ULg; Rollin, Frédéric ULg; Amory, Hélène ULg et al

in Archives Internationales de Physiologie et de Biochimie (1989)

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See detailThe effect of airway occlusion and lobeline-induced hyperventilation on diaphragmatic strength in ponies
Desmecht, Daniel ULg; Art, Tatiana ULg; Rollin, Frédéric ULg et al

in Archives Internationales de Physiologie et de Biochimie (1989)

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See detailInertial pressures in exercising ponies
Art, Tatiana ULg; Lekeux, Pierre ULg; Gustin, Pascal ULg et al

in Archives Internationales de Physiologie et de Biochimie (1989)

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See detailEffect of acute hypoxia on the pulmonary haemodynamics in two different breeds of cattle
Amory, Hélène ULg; Rollin, Frédéric ULg; Art, Tatiana ULg et al

in Archives Internationales de Physiologie et de Biochimie (1989)

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See detailEffect of increasing speed and incline on ventilation in thoroughbred horses exercising on a treadmill
Art, Tatiana ULg; Anderson, L.; Roberts, c et al

in Archives Internationales de Physiologie et de Biochimie (1989), 97(5), 85

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See detailInertance of the Respiratory System in Ponies
Art, Tatiana ULg; Lekeux, Pierre ULg; Gustin, Pascal ULg et al

in Journal of Applied Physiology (Bethesda, Md. : 1985) (1989), 67(2), 534-540

The purpose of the present work was to measure the pulmonary inertance (IL) in ponies and to analyze its potential influence on the mechanics of breathing and on their aptitude to increase ventilation ... [more ▼]

The purpose of the present work was to measure the pulmonary inertance (IL) in ponies and to analyze its potential influence on the mechanics of breathing and on their aptitude to increase ventilation during exercise. Five healthy ponies 2.4-4 yr old [mean wt 255 +/- 15 (SE) kg] were used. On the one hand, inertance of the respiratory system (Irs) was computed from the value of the resonant frequency (fr) measured by the forced oscillation technique. On the other hand, respiratory airflow, tidal volume (VT), and transpulmonary pressure (PL) changes were recorded while the ponies were performing a light treadmill exercise, and IL was calculated as the ratio of the associated differences in inertial pressure (delta Pin) to volume acceleration (delta V). Respiratory airflow and VT were measured with a Fleisch pneumotachograph (no. 5) and PL with an intraesophageal balloon catheter. First, the protocol was carried out with the ponies breathing air and He-O2, second, while the ponies breathed through two additional tubes (100 cm long, 3 cm ID), then one, and finally none, fixed on the Fleisch pneumotachograph. Finally, the contribution of the extra- vs. the intrathoracic airways to IL was estimated by measuring the lateral midtracheal pressure recorded simultaneously with the aforementioned parameters. The values of Irs calculated with fr and of IL calculated on the basis of the delta Pin-delta V ratio were 29.8 +/- 0.4 and 19.8 +/- 1.0.10(-4) kPa.l-1.s-2, respectively. During He-O2 breathing IL decreased about three times; this result was similar to the predicted decrease based on gas density only.(ABSTRACT TRUNCATED AT 250 WORDS) [less ▲]

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See detailWork of Breathing in Exercising Ponies
Art, Tatiana ULg; Lekeux, Pierre ULg

in Research in Veterinary Science (1989), 46(1), 49-53

This paper attempts to evaluate the changes in the mechanical work of breathing induced by the increase of ventilation in ponies exercising on a treadmill. Airflow, tidal volume (VT) and oesophageal ... [more ▼]

This paper attempts to evaluate the changes in the mechanical work of breathing induced by the increase of ventilation in ponies exercising on a treadmill. Airflow, tidal volume (VT) and oesophageal pressure were simultaneously recorded in eight ponies (four to six years old and weighing 258 +/- 11 kg) before, during and after standardised exercise. Respiratory frequency, VT and minute volume (Ve) for each phase of the experimental protocol were calculated from the collected data. The pressure-volume diagrams were traced and the work per cycle (Wrm) was estimated by measuring the area enclosed in the loop. The work per minute (Wrm) and the work per litre of ventilation (Wrm litre-1) were also calculated. From rest to fast trot Wrm litre-1, Wrm and Wrm had increased 8.1, 13.0 and 55.6 times, respectively. The relationships between Ve and Wrm litre-1 was linear and that between Ve and Wrm curvilinear. Results suggested that the mechanical cost of the work of breathing could be a limiting or at least a constraining factor of the increase of ventilation during strenuous exercise in ponies [less ▲]

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See detailEffets physiologiques de différents types de stress chez le chien avant et après blocage de stress chez le chien avant et après blocage beta-adrénergique par le carzolol
Gabriel, Annick ULg; Art, Tatiana ULg; Lekeux, Pierre ULg

in Annales de Médecine Vétérinaire (1989), 133

The purpose of this experiment was to study (1) some cardio-vascular and metabolic effects of two different stress and (2) the modifications of these stress responses induced by a preventive ... [more ▼]

The purpose of this experiment was to study (1) some cardio-vascular and metabolic effects of two different stress and (2) the modifications of these stress responses induced by a preventive administration of carazolol. Five healthy beagle dogs were used. Firstly, a pharmacological stress was induced by an intravenous (IV) administration of epinephrine tartrate (1 ug/kg). The (3 adrenergic blockade was realised by an administration of carazolol (10ug/kg, IV). The changes in heart rate (HR), haematocrit, glycemia and blood gases were studied (1) to assess the stress-induced adjustements, (2) to study the effect of a R-adrenergic blockade on quiet resting dogs and (3) to estimate the efficiency of this blockade on the stress responses. Secondly, the dogs performed a standardized treadmill exercise, in order to produce a physiological stress. The adjustements to exercise on the one hand and the changes in these adjustements induced by a preventive administration of carazolol (10 ug/kg, I.M.) on the other hand were measured by the recording of the HR before, during and after the exercise. Epinephrine tartrate induced significant changes of HR, haematocrit and glycemia. The Beta-blockade reduced significantly these changes (P < 0,01). The exercise-induced increase of HR was also significantly reduced by the (beta-blockade (P < 0,01). On the oher hand, this blockade has no effects on the resting measured parameters. This study suggests that Beta-blockade by the carazolol has no indesirable effects on resting dogs and that it prevents the cardio-vascular and metabolic effects of stress. [less ▲]

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