Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailExercise Versus Dobutamine-Induced St Elevation in the Infarct-Related Electrocardiographic Leads: Clinical Significance and Correlation with Functional Recovery
Lancellotti, Patrizio ULiege; Seidel, Laurence ULiege; Hoffer, E. et al

in American Heart Journal (2001), 141(5), 772-9

BACKGROUND: The clinical significance of stress-induced ST elevation early after acute myocardial infarction and its relation to functional recovery remain controversial. The aims of this study were (1 ... [more ▼]

BACKGROUND: The clinical significance of stress-induced ST elevation early after acute myocardial infarction and its relation to functional recovery remain controversial. The aims of this study were (1) to determine the incidence of ST elevation during dobutamine and exercise tests and (2) to assess the relative accuracy of exercise and dobutamine ST elevation for predicting functional recovery after acute myocardial infarction. METHODS AND RESULTS: We investigated 52 patients who underwent supine exercise (from 25 W to maximal charge) and dobutamine (from 5 to 40 microg/kg per minute and up to 1 mg atropine) stress electrocardiography in the same position. ST elevation was defined as new or worsening at >1 mm, 80 ms after J point. Echocardiography and quantitative angiography were available in all patients before hospital discharge. The follow-up resting echocardiogram was recorded 30 +/- 6 days after the acute event. ST elevation developed during 30 (58%) dobutamine and 24 (46%) exercise tests. The sum of ST elevation was higher during dobutamine testing (7.7 +/- 3.8 mm) than during exercise (5.5 +/- 2.5 mm) (P =.03). A low peak creatine kinase level was the single independent predictor of dobutamine-induced ST elevation. Functional improvement occurred in 35 patients. Two independent predictors of functional recovery were selected from multivariate analysis: dobutamine ST elevation (chi(2) = 9.1; P =.0026) and low peak creatine kinase level (chi(2) = 5.1; P =.025). When dobutamine ST elevation was not included in multivariate analysis, exercise-induced ST elevation emerged as an independent predictor of functional recovery (chi(2) = 5.0; P =.023). Significant linear correlation was found between the sum of ST elevation at peak dobutamine stress and the extent of functional recovery (r = 0.87; P <.0001). In contrast, no correlation was observed with exercise ST elevation (r = 0.06; P = not significant). CONCLUSIONS: Stress-induced ST elevation is an ancillary sign of viable myocardium that can recover. The sum of ST elevation at peak dobutamine stress correlates with the extent of functional recovery. [less ▲]

Detailed reference viewed: 6 (3 ULiège)
Full Text
Peer Reviewed
See detailExercise-induced changes in degenerative mitral regurgitation
Magne, Julien ULiege; Lancellotti, Patrizio ULiege; Pierard, Luc ULiege

in Journal of the American College of Cardiology (2010), 56(4), 300-309

OBJECTIVES: We sought to quantify exercise-induced changes in patients with degenerative mitral regurgitation (MR), to examine the relationship between exercise-induced changes in MR and in systolic ... [more ▼]

OBJECTIVES: We sought to quantify exercise-induced changes in patients with degenerative mitral regurgitation (MR), to examine the relationship between exercise-induced changes in MR and in systolic pulmonary artery pressure (PAP), and to identify their potential impact on symptom-free survival. BACKGROUND: MR severity can change during exercise in patients with functional MR. Quantified changes in MR severity during exercise remain undetermined in patients with degenerative MR. METHODS: Resting and bicycle exercise Doppler-echocardiography were performed in 61 asymptomatic patients (age 62+/-14 years) with moderate to severe degenerative MR (i.e., mitral valve prolapse or flail). Mitral regurgitation was quantified at rest and exercise with effective regurgitant orifice (ERO) area and regurgitant volume calculated with the proximal isovelocity surface area (EROP) and the quantitative Doppler (EROD) methods. RESULTS: At rest, EROP and EROD were well-correlated (r=0.87, p<0.0001), but EROD was larger than EROP (54+/-21 mm2 vs. 42+/-24 mm2, p<0.0001). During exercise, mean ERO and regurgitant volume markedly increased in 32% of patients by >or=10 mm2 and >or=15 ml, respectively. There was good correlation between exercise EROP and EROD (r=0.84, p<0.0001). Changes in systolic PAP were correlated with changes in ERO and regurgitant volume (r=0.59, p=0.02 and r=0.60, p=0.02). Patients with a marked increase in regurgitant volume during exercise had lower symptom-free survival than those in whom MR decreased or remained unchanged (p=0.0015). CONCLUSIONS: Degenerative MR might be dynamic and increases during exercise in one-third of patients. Marked changes in MR severity are associated with exercise-induced changes in systolic PAP and reduced symptom-free survival. [less ▲]

Detailed reference viewed: 27 (2 ULiège)
Full Text
Peer Reviewed
See detailExercise-induced dystonia as a preceding symptom of familial Parkinson's disease
Bruno, Michiko K; Ravina, Bernard; Garraux, Gaëtan ULiege et al

in Movement Disorders (2004), 19(2), 228-230

Paroxysmal exercise-induced dystonia can occur with Parkinson's disease (PD), and in rare cases, this can also be the presenting symptom. We report on 2 second cousins (no known consanguinity) who ... [more ▼]

Paroxysmal exercise-induced dystonia can occur with Parkinson's disease (PD), and in rare cases, this can also be the presenting symptom. We report on 2 second cousins (no known consanguinity) who presented with paroxysmal exercise-induced dystonia who later developed clinical features of PD. Although autosomal recessive inheritance was suggested, and the dystonic features further suggest parkin as a possible cause, ssequencing for parkin mutations was negative and this family may represent a genetic variant of PD. Further genotype-phenotype studies in this and similar families may give clues to pre-symptomatic symptoms in PD and may reflect a particular phenotype of interest for genetics studies in the future. [less ▲]

Detailed reference viewed: 52 (4 ULiège)
Full Text
Peer Reviewed
See detailExercise-induced oxidative stress in overweight adolescent girls: roles of basal insulin resistance and inflammation and oxygen overconsumption.
Youssef, H.; Groussard, C.; Pincemail, Joël ULiege et al

in International Journal of Obesity & Related Metabolic Disorders (2009), 33(4), 447-55

HYPOTHESIS: Basal insulin resistance (IR) and inflammation exacerbate post-exercise oxidative stress (OS) in overweight adolescent girls. DESIGN: Cross-sectional study, effect of incremental ergocycle ... [more ▼]

HYPOTHESIS: Basal insulin resistance (IR) and inflammation exacerbate post-exercise oxidative stress (OS) in overweight adolescent girls. DESIGN: Cross-sectional study, effect of incremental ergocycle exercise until exhaustion on OS markers. PARTICIPANTS: Normal-weight (control) (n=17, body mass index (BMI): 20-24.2 kg/m(2)) and overweight adolescent girls (n=29, BMI: 24.1-36.6 kg/m(2)). MEASUREMENTS: Dietary measurement, physical activity assessment (validated questionnaires), fat distribution parameters (by dual-energy X-ray absorptiometry and anthropometry) and maximal oxygen consumption (VO2peak). Blood assays include the following: (1) at fasting state: blood cell count, lipid profile, and IR parameters (leptin/adiponectin ratio (L/A), homeostasis model assessment of IR, insulin/glucose ratio; (2) before exercise: inflammation and OS markers (interleukin-6 (IL-6), C-reactive protein (CRP), myeloperoxidase (MPO), reduced glutathione/oxidized glutathione ratio (GSH/GSSG), 15 F(2)alpha-isoprostanes (F(2)-Isop), lipid hydroperoxides (ROOH), oxidized low-density lipoprotein (ox-LDL)) and antioxidant status (superoxide dismutase (SOD), glutathione peroxidase (GPX), vitamin C, alpha-tocopherol and beta-carotene); and (3) after exercise: inflammation and OS markers. RESULTS: At rest, overweight girls had a deteriorated lipid profile and significantly higher values of IR parameters and inflammation markers, compared with the control girls. These alterations were associated with a moderate rest OS state (lower GSH/GSSG ratio, alpha-tocopherol/total cholesterol (TC) ratio and GPX activity). In absolute values, overweight girls exhibited higher peak power output and oxygen consumption (VO2peak), compared with the control girls. Exercise exacerbated OS only in the overweight group (significant increase in F(2)-Isop, ROOH and MPO). As hypothesized, basal IR and inflammation state were correlated with the post-exercise OS. However, the adjustment of F(2)-Isop, ROOH and MPO variation per exercise VO(2) variation canceled the intergroup differences. CONCLUSION: In overweight adolescent girls, the main factors of OS, after incremental exhaustive exercise, are not the basal IR and inflammation states, but oxygen overconsumption. [less ▲]

Detailed reference viewed: 51 (6 ULiège)
Full Text
Peer Reviewed
See detailExercise-induced physiological adjustments to stressful conditions in sports horses
Art, Tatiana ULiege; Lekeux, Pierre ULiege

in Livestock Production Science (2005), 92(2), 101-111

Among athletic/sports animals, the horse has a unique ability to increase its oxygen uptake by a factor of 60 during heavy exercise. This is achieved by physiological adaptations of all the links in the ... [more ▼]

Among athletic/sports animals, the horse has a unique ability to increase its oxygen uptake by a factor of 60 during heavy exercise. This is achieved by physiological adaptations of all the links in the oxygen chain. Ventilation is increased by a factor of 30. Since the horse is a compulsory nasal breather, this hyperpnea necessitates high transmural pressure changes, which may be responsible for the dynamic collapse of the airways. Blood flow is increased by a factor of 10. Since the left ventricle is not very compliant, this increase necessitates a high filling pressure in the pulmonary circulation, which may induce capillary stress failure and exercise-induced pulmonary haemorrhage. Lastly, oxygen transport is improved by splenic contraction which increases haemoglobinemia by 50%. Sports horses frequently suffer from several problems, which are related either to endogenous or exogenous stresses experienced during their career. These stresses, caused by the use of the horse as a competition animal, may lead to several medical problems. At a systemic level, endogenous stresses include hyperkaliemia, lactacidemia, and hyperthermia; oxidative stress may induce problems at a general, and/or a pulmonary level. External factors, e.g. poor quality of inspired air, transport, hot and humid ambient conditions, and microbiological agents, may also induce abnormal body attacks, and lead to health problems. [less ▲]

Detailed reference viewed: 40 (5 ULiège)
Full Text
Peer Reviewed
See detailExercise-induced pulmonary perfusion redistribution in heaves
Harmegnies, N. F.; Duvivier, D. H.; Vandenput, Sandrina ULiege et al

in Equine Veterinary Journal. Supplement (2002), 34(suppl), 478-484

This study aimed to compare exercise-induced pulmonary perfusion redistribution in healthy vs. 'heavey' horses using scintigraphy, a minimally invasive technique. Six healthy (A) and 5 'heavey' horses in ... [more ▼]

This study aimed to compare exercise-induced pulmonary perfusion redistribution in healthy vs. 'heavey' horses using scintigraphy, a minimally invasive technique. Six healthy (A) and 5 'heavey' horses in remission (B(I)) and during clinical signs of disease (B(II)) were investigated. Dimensions of the exercising pulmonary perfusion (QE) images were expressed in percent of the resting perfusion (QR) images. Computed QE to QR ratios (QE/QR) images enabled the definition of the region more perfused at exercise than at rest (R1). In all groups, exercise induced a major enlargement of the Q image but a larger increase of the lung height was found in 'heavey' horses. Compared to A, 'heavey' horses showed a larger R1 region with a significantly higher QE/QR. Location of R1 pointed out the dorsal lung region as a major site of pulmonary perfusion redistribution for all groups. This work demonstrated (1) the feasibility of using scintigraphy for studying exercise-induced pulmonary perfusion redistribution; (2) perfusion redistribution to the dorsal lung with exercise and (3) an intensified redistribution in 'heavey' horses, either clinically affected or not. [less ▲]

Detailed reference viewed: 29 (5 ULiège)
Full Text
Peer Reviewed
See detailExercise-triggered chest pain as an isolated symptom of myocarditis in children
Tshimanga, Prisca; Daron, Benoît; FARHAT, Nesrine ULiege et al

in Clinics and Practice (2016), 6:843

Detailed reference viewed: 20 (11 ULiège)
See detailExercises in astronomy.
Kleczek, J.; Minnaert, M. G. J.; Allen, D. A. et al

in Exercises in astronomy.. J. Kleczek (Editor).Revised and extended edition of "Practical work in elementary astronomy" by M. G. J. Minnaert. D. ReidelPublishing Co., Dordrecht, The Netherlands. 24+339 pp. Price Dfl. 140.00, US 64.00, £ 49.50 cloth; Dfl. 59.00, US 19.50, £ 18.00 paper (1987). ISBN 90-277-2409-1 cloth, ISBN 90-277-2423-7 paper. (1987)

This book is an updated and considerably extended version of Minnaert's work published in 1969 (01.003.051).Many new exercises referring to new observational techniques and methods have been incorporated ... [more ▼]

This book is an updated and considerably extended version of Minnaert's work published in 1969 (01.003.051).Many new exercises referring to new observational techniques and methods have been incorporated by the editor in collaboration with the contributing authors D. A. Allen, Z. Ceplechka, S. Ferraz Mello, K. J. Gordon, L. Houziaux, C. Jaschek, Z. Kopal, J. Manfroid, J. PalouÅ¡, J. Podolský, G. R. Quast, J. Surdej, A. B. Underhill, J. M. Vreux, D. G. Wentzel.The exercises are organized in the following sections:A. The planetary system: 1. Space and time, instruments. 2. The motions of celestial bodies. 3. Planets and satellites.B. The stars: 1. The Sun. 2. Stars and nebulae. 3. Stellar systems. [less ▲]

Detailed reference viewed: 169 (4 ULiège)
See detailExérèse microchirurgicale atraumatique intranodulaire d'un schwanome bénin du sciatique poplité externe
LEJEUNE, G; LECLERCQ, Daniel ULiege; CARLIER, Alain ULiege et al

in Actualités chirurgicales - 81ème Congrès Fr. Chirurgie, Orthopédie, Traumatologie (1980)

Detailed reference viewed: 35 (0 ULiège)
See detailExergetic evaluation of process alternatives utilizing biomass or CO2 as raw material
Pfennig, Andreas ULiege; Frenzel, P

Conference (2012)

Detailed reference viewed: 2 (0 ULiège)
Full Text
Peer Reviewed
See detailExergetic, environmental and economic analysis of a biomass cogeneration plant connected to a district heating network.
Sartor, Kevin ULiege; Dewallef, Pierre ULiege

in Renewable Energy in the Service of Mankind Vol II (2015)

When a district heating network is fed by natural gas boilers (or biomass boilers), the selection of the network temperature level has a slight influence on the boiler efficiency which means that ... [more ▼]

When a district heating network is fed by natural gas boilers (or biomass boilers), the selection of the network temperature level has a slight influence on the boiler efficiency which means that producing at low temperature allows only to decrease the heat losses through the network. However when a cogeneration plant based on a Rankine cycle is used, lowering the network temperature not only decreases the heat losses but also increase the electrical efficiency while decreasing the thermal efficiency. This aspect is very often overlooked when the quality of a cogeneration plant is assessed by the cogeneration efficiency namely the sum of the electrical and thermal efficiency which is misleading for decision makers. In this contribution, an existing cogeneration plant connected to a district heating network installed on the University Campus in Liège (Belgium) is used as an application test case. Based on actual operational and economic data, a detailed economic evaluation is carried out which is supported by a calibrated simulation model of the whole installation in order to study the influence of the network temperature level. As a second step, the simulation model is used again to perform a detailed exergetic analysis intended to give physical insights to the economical study. This results in a broader discussion on the several methods to assess the quality of cogeneration plants and the opportunity to develop such a technology together with district heating networks. [less ▲]

Detailed reference viewed: 80 (14 ULiège)
Full Text
See detailExergetic, environmental and economic analysis of a biomass cogeneration plant connected to a district heating network.
Sartor, Kevin ULiege

in Book of abstracts of WREC2014 (2014, August 05)

Detailed reference viewed: 40 (10 ULiège)
See detailExergetical Evaluation of Biobased Synthesis Pathways
Frenzel, P; Fayyaz, S; Hillerbrand, R et al

Conference (2011)

Detailed reference viewed: 5 (0 ULiège)
Full Text
Peer Reviewed
See detailExergetical Evaluation of Biobased Synthesis Pathways
Frenzel, Philipp; Hillerbrand, Rafaela; Pfennig, Andreas ULiege

in Polymers (2014), 6(2), 327-345

Detailed reference viewed: 23 (11 ULiège)
See detailExergetische Bewertung der Routen zur stofflichen Nutzung von Biomasse
Frenzel, Philipp; Fayyaz, Sara; Hillerbrand, Rafaela et al

Conference (2011)

Detailed reference viewed: 11 (0 ULiège)
See detailExergetische Bewertung der Routen zur stofflichen Nutzung von Biomasse
Fayyaz, S; Frenzel, P; Hillerbrand, R et al

Conference (2011, May 05)

Detailed reference viewed: 4 (0 ULiège)
See detailExergetische Bewertung neuer Syntheserouten ausgehend von biobasierten Rohstoffen
Fayyaz, Sara; Frenzel, Philipp; Hillerbrand, Rafaela et al

Conference (2011)

Detailed reference viewed: 3 (0 ULiège)
See detailExergetische Bewertung neuer Syntheserouten ausgehend von alternativen Kohlenstoffquellen
Frenzel, P; Hillerbrand, R; Pfennig, Andreas ULiege

Conference (2012)

Detailed reference viewed: 1 (0 ULiège)
Full Text
Peer Reviewed
See detailExergy analysis applied to performance of buildings in Europe
Sartor, Kevin ULiege; Dewallef, Pierre ULiege

in Energy and Buildings (2017), 148

Energy performance of buildings generally assesses the energy consumption of buildings such as heating, domestic heat water, ventilation systems, etc. However, this approach is based on the first law of ... [more ▼]

Energy performance of buildings generally assesses the energy consumption of buildings such as heating, domestic heat water, ventilation systems, etc. However, this approach is based on the first law of thermodynamics and considers only the quantity of energy used without considering its ‘quality’ and leads to a lack of information about the energy conversion processes. This is particularly true in the new low-energy buildings where sometimes high temperatures sources are used to meet low-temperature needs. The exergy analysis of a system, based on first and second thermodynamic laws, can be used to overcome this. In this work, it is proposed to compare the energy and the exergy consumption and the related CO2 emissions of several kinds of buildings to determine the best systems in terms of energy and exergy needs. The energy demand calculations are performed using the official software available in Belgium and some assumptions are implemented to consider the exergy approach. As exergy calculations require a reference state, some different climatic conditions are also investigated. Finally, some conclusions are discussed to rank the sources of energy and their related exergy losses. [less ▲]

Detailed reference viewed: 37 (8 ULiège)