288 research outputs found
Son i entrenament esportiu
En aquest treball es presenta l’adaptació psicomètrica del Qüestionari de Son de l’Esportista (CSD). Es va administrar el CSD, l’EPQ-A (Qüestionari d’Eysenck-A) i el Qüestionari de Diürnitat-Nocturnitat d’Östeberg a una mostra formada per 92 esportistes d’alt nivell del CAR de Sant Cugat del Vallès, Residència Blume i FC Barcelona. Els resultats van mostrar tres subgrups d’esportistes d’acord amb la qualitat del son avaluada mitjançant el CSD i es van observar diferències estadÃsticament significatives pel que fa a la qualitat del son i a variables de personalitat
Sueño y entrenamiento deportivo
En este trabajo se presenta la adaptación psicométrica del Cuestionario de Sueño del Deportista (CSD). Se administró el CSD, el EPQ-A (Cuestonario de Eysenck-A) y el Cuestionario de Diurnidad-Nocturnidad de Östberg a una muestra formada por 92 deportistas de alto nivel del CAR de Sant Cugat del Vallès, Residencia Blume y FC Barcelona. Los resultados mostraron tres subgrupos de deportistas en función de la calidad del sueño evaluada a través del CSD y se observaron diferencias estadÃsticamente significativas en cuanto a la calidad del sueño y a variables de personalidad
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Influence of redox equilibrium on the properties of glasses with a high iron concentration
In glasses of the System Na2O-CaO-SiO2-Fe2O3, Fe2+ and Fe3+ ions were found by Mössbauer spectroscopy. In samples melted in oxidizing atmosphere, both ions occurred in tetrahedral coordination, whereas they occurred in coordination number 6 in samples with high iron content and melted under reducing conditions. It is shown that a total iron concentration has a stronger influence on the glass properties than the redox state.
Differences in the properties of glasses melted in oxidizing and reducing atmosphere, respectively, were observed at lower temperatures, while at higher temperatures they are very small (however, the tendency is still maintained). Density, microhardness, transition temperature and thermal expansion coefficient of the glasses studied are affected by the changes in redox equilibrium. One can conclude that after reducing treatment iron ions present in the glass structure play a similar role as a network modifier. At higher temperatures, this kind of activity is very weak, according to viscosity and liquidus temperature measurements
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Processing of molten solid residues
An alternative way of recovery, recycling and re-integration of solid wastes on a laboratory scale is demonstrated. The analysed synthetic slags belong to the System SiO2-Al2O3-CaO-MgO-Fe2O3-K2O-Na2O. Α polynomial model has been developed by means of a computing program in order to calculate some important technological features directly from a variable oxide concentration and to determine a processable composition. Furthermore, a concept of maximum application of the residues is suggested for slags from waste incineration and other industrial processes with relative low volatile components.
Rolling has been chosen as the most suitable forming technique, because recycling melts show a short forming interval and an aggressive behaviour towards refractory materials. It is possible to form plates or tiles which afterwards can additionally be shaped e.g. to create profiles or breaking points. Because of their affmity to crystallization the glassy end-products can be devitrified at the surface (into semicrystalline products, i.e. glass-ceramics) to receive a better resistance. The present results show the possibility of using well known forming and treating processes to make high value products from low-value by-products, with a considerable economical advantage
Reduced atrial contribution to left ventricular filling in patients with severe tricuspid regurgitation after tricuspid valvulectomy: A Doppler echocardiographic study
AbstractPatients undergoing valvulectomy for isolated tricuspid valve endocarditis offer the unique opportunity to study the effects of acquired right ventricular volume overload on left ventricular filling in persons free of pulmonary hypertension and preexisting left heart disease. Eleven patients who had undergone total or partial removal of the tricuspid valve were compared with 11 age-matched control subjects; Doppler echocardiographic techniques were used to quantify changes in left ventricular filling and to relate them to changes in left ventricular and left atrial geometry caused by right ventricular and right atrial distension.The late diastolic fractional transmitral flow velocity integral, a measure of the left atrial contribution to left ventricular filling, was significantly decreased in patients undergoing tricuspid valvulectomy compared with control subjects (0.22 ± 0.11 versus 0.32 ± 0.09; p < 0.04). Severe tricuspid regurgitation in these patients resulted in marked right atrial distension, reversal of the normal interatrial septal curvature and compression of the left atrium such that left atrial area was significantly smaller than in control subjects (5.9 ± 2.2 versus 8.6 ± 1.2 cm2/m2; p < 0.005).Acting as a receiving chamber, the left ventricle was maximally compressed by the volume-overloaded right ventricle in late diastole coincident with the timing of atrial systole, resulting in a significant increase in the left ventricular eccentricity index compared with that in control subjects (1.35 ± 0.14 versus 1.03 ± 0.1; p < 0.001). Thus, right ventricular volume overload due to severe tricuspid regurgitation results in left heart geometric alterations that decrease left atrial preload, impair left ventricular receiving chamber characteristics and reduce the atrial contribution to total left ventricular filling
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