3,243 research outputs found
Acute and post-exercise physiological responses to different hypoxic exercises
No full textA better understanding of the acute and post-exercise physiological responses to hypoxic exercise (i.e. exercise combined with hypoxic stress) can provide knowledge to improve human tolerance to high altitude environments, also providing helpful information for the adoption of safe exercise protocols in individuals engaged in hypoxic exercise training. This doctoral thesis investigated the acute exercise and post-exercise physiological responses evoked by hypoxic exercises of various intensities and nature, providing new insights into the understanding of the complex interaction between exercise and hypoxic stimuli in inducing the aforementioned responses. Study 1 investigates the effects of hypoxia (FiO2=13.4%, ≈3500 m) on the acute exercise and post-exercise cardiorespiratory and cardiac autonomic responses to a maximal cardiopulmonary exercise test. The study shows that cardiac autonomic recovery is delayed in response to a maximal cardiopulmonary exercise test in hypoxia and that the degree of cardiac autonomic recovery impairment is directly related to the increase of exercise-induced physiological stress associated with hypoxic exercise. Study 2 aims at examining the effects of hypoxic exercise (FiO2=14.2%, ≈3000 m) performed at the same absolute intensity (i.e. 80% of the power output at the first ventilatory threshold) or same relative intensity (i.e. heart rate matched exercise) of normoxic exercise on the exercise cardiac autonomic and cardiorespiratory responses. The study shows that moderate heart rate matched hypoxic exercise triggers similar cardiac autonomic and physiological responses to normoxic exercise with a reduced mechanical load; whilst the same absolute intensity exercise in hypoxia is associated with increased exercise-induced physiological stress and delayed cardiac autonomic recovery. Study 3 aims at examining the effects of hypoxic exercise (FiO2=14.2%, ≈3000 m) performed at the same absolute (i.e. work rate matched exercise) or same relative (i.e. heart rate matched exercise) normoxic exercise intensity on the post-exercise cardiac autonomic and cardiovascular responses. The study shows that moderate heart rate matched hypoxic exercise (≈75% HRmax) does not affect cardiac baroreflex sensitivity and does not blunt cardiac autonomic recovery during post-exercise recovery, but does not induce significant post-exercise hypotension. Conversely, work rate matched hypoxic exercise, resulting in greater physiological stress, delays cardiac autonomic recovery, temporarily decreases cardiac baroreflex sensitivity and evokes prolonged post-exercise hypotension. Study 4 aims at investigating the effects of a simulated mountain hike in a cold and hypoxic environment (-25°C, FiO2=11%, ≈5000 m) on cardiac autonomic activity, and the influence of two different strategies (i.e. different work-rest durations, long vs short) on the physiological and perceptual responses associated with the simulated ascent. The study shows that reduced work-rest durations are associated with improved perceptual responses and less perturbation of cardiac autonomic balance compared to longer work-rest durations in response to a simulated hike at high altitude. Investigating the acute exercise and post-exercise physiological responses evoked by hypoxic exercises of various intensities and nature, this doctoral thesis and the data presented herein want to expand our understanding of hypoxic exercise and stimulate new research on this topic
o-Minimal cohomology: Finiteness and Invariance Results
No full textThe topology of definable sets in an o-minimal expansion of a group is not fully understood due to the lack of a triangulation theorem. Despite the general validity of the cell decomposition theorem, we do not know whether any definably compact set is a definable CW-complex. Moreover the closure of an o-minimal cell can have arbitrarily high Betti numbers. Nevertheless we prove that the cohomology groups of a definably compact set over an o-minimal expansion of a group are finitely generated and invariant under elementary extensions and expansions of the language
A imagem de Alessandro Baricco no Brasil
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão, Programa de Pós-Graduação em Estudos da Tradução, Florianópolis, 2013.Com a intenção de delinear o modo pelo qual o escritor italiano Alessandro Baricco se inseriu no sistema literário brasileiro e os caminhos percorridos pelos seus livros traduzidos, esta dissertação dá voz às experiências tradutórias de seus tradutores. A inserção de Bariccono Brasil tem seu início em 1997, através de uma proposição da Profa. Dra. Roberta Barni à editora Iluminuras da tradução de Oceano Mare. A partir daí, outras sete obras foram publicadas no Brasil, sendo três delas traduzidas por Roberta Barni e as outras quatro por quatro tradutores diferentes. De um lado, considera-se o tradutor como figura principal namediação entre culturas, e, de outro, se analisa a realidade desta figuradentro do sistema literário, sua invisibilidade, seus limites e o exercíciode sua profissão. A pesquisa conta, ainda, com críticas e resenhas referentes ao autor italiano publicadas em jornais consagrados no Brasil, considerando estas como parte constituinte da imagem de Baricco refletida em território nacional. Abstract : Intending to delineate the way the Italian writer Alessandro Baricco has been inserted in the Brazilian literary system and the paths his translated books have followed, this thesis gives voice to the translating experiences of his translators. Baricco's insertion in Brazil began in 1997, through a personal project of Dr. Roberta Barni, with her translation of Oceano Mare. Since then, seven other of his works have been published in Brazil, three of which were translated by Roberta Barni and the other four by four different translators. On the one hand,the translator is considered as the main figure in mediation betweencultures and, on the other, this figure's reality is analyzed within theliterary system: its invisibility, its limits and its professional practice. Criticisms and reviews of this Italian author published in well established Brazilian newspapers are also considered, with the understanding that they are part of Baricco's image reflected here
La maturità di Alessandro Fei del Barbiere, in bilico tra Maniera e Riforma
No full textThis article studies the mature career of the Florentine painter Alessandro Fei del Barbiere (1537-1592), beginning with the rediscovery of the 'Ascension' altarpiece formerly in the Albizi Chapel in the destroyed church of San Pier Maggiore, Florence. Studying this painting and others recorded in 1584 by the biographer Raffaello Borghini, such as the two altarpieces for Santa Maria delle Grazie and the Madonna dell'Umiltà in Pistoia, the author reconstructs a body of works showing how in the 1580s Fei gradually went beyond the archaic style of his apprenticeship - he had been trained by Ridolfo del Ghirlandaio and Pierfrancesco Foschi, but was also marked by the Maniera of Vasari - evolving towards naturalism in both mimesis and pictorial handling. In Florence, his development partly parallels that of Santi di Tito and his circle, but Fei was also influenced by a probable sojourn during the early part of that decade in Rome, where he could have been inspired by Girolamo Muziano and the painters working for Pope Gregory XIII. Among other proposals, the author suggests that the artist was responsible for decorating the chancel of Fiesole Cathedral (c. 1584-1589), which consisted of an altarpiece, only rarely discussed by scholars, and a cycle of frescoes hitherto attributed to Nicodemo Ferrucci
Alle radici del futuro. Ricerche e progetti attorno ad alcuni strumenti scientifici sette-ottocenteschi dell’Università di Ferrara
No full textIl Dipartimento di Fisica, ove è conservata la “Collezione Instrumentaria delle Scienze Fisiche”, e il Dipartimento di Architettura dell’Università di Ferrara hanno sviluppato dal 2008 un progetto di ricerca con lo scopo principale di favorire la diffusione della cultura scientifica e la valorizzazione di questo significativo patrimonio culturale dell’Ateneo.
La ricerca si è dapprima tradotta nell’ordinamento di una selezione di strumenti scientifici e nella progettazione museografica di una mostra temporanea allestita nel Salone dei Passi Perduti a Palazzo Renata di Francia a Ferrara.
Al fine di coordinare le diverse tecnologie necessarie per un corretto allestimento degli strumenti, si sono attivati interessanti processi di trasferimento tecnologico di competenze specifiche di aziende, poi alla base di nuove attività di ricerca nel campo delle tecnologie multimediali applicate al patrimonio dei musei scientifici, nell’ambito della Rete Alta Tecnologia dell’Emilia Romagna
Dye-Sensitized Solar Hydrogen Production: The Emerging Role of Metal-Free Organic Sensitizers
No full textThe production of hydrogen from sunlight and water is finding an increasingly important role in the production of clean fuels from sustainable and abundant energy sources. In this process, commonly referred to as artificial photosynthesis, the role of the dye sensitizer is critical for optimizing the harvesting of visible light and triggering the reduction reaction at the catalytic active site. In recent decades organometallic sensitizers have mainly been studied, often requiring the use of scarce and, in some cases, toxic elements. This microreview describes the state of the art in the use of metal-free organic sensitizers, highlighting advantages over their organometallic counterparts. The main design and synthetic strategies, specific properties, and device performances are presented. Thanks to recent advances and lower manufacturing costs, organic sensitizers seem set to be of increasing importance for next-generation clean fuels
Tra socialdemocrazie e Perestrojka. Le relazioni internazionali del Pci attraverso le carte di Alessandro Natta
No full textThis essay reconstructs the foreign policy of the Italian Communist Party during the four
years of Alessandro Natta’s secretariat (1984-1988) through largely original archival documentation,
from the Alessandro Natta Fonds of the Historical Archive of the Chamber of
Deputies. Natta’s papers are also cross-referenced with those kept in the PCI Archive at the
Gramsci Foundation. The author analyses the relationship that the PCI establishes with
Gorbachev’s Perestroika, Deng’s China, and European social democracies during the last
years of the Cold War
Effects of low vs moderate dose of recreational football on cardiovascular risk factors
No full textThis study aimed to compare the effectiveness of recreational football performed once (LOW) vs. twice (MOD) a week on cardiovascular risk factors in healthy, sedentary men. Body composition, resting blood pressure, blood lipid profile and maximal oxygen consumption (VO2max) were measured at baseline, after a 12-week control and training period, using an interrupted time series study (study 1, n=18: n=8, LOW and n=10, MOD) nested in a randomised parallel trial (study 2, n=34: n=18 LOW and n=16 MOD). After the intervention in the study 1, LDL-Cholesterol (-12.3 mg•dL-1 [-22.7 to -2.0]) and VO2max (4.5 ml•kg-1•min-1 [1.2 to 7.8 ]) changed in LOW whereas differences were found in weight (-2.1 kg [-3.7 to -0.4]), BMI (-0.7 kg•m-2 [-1.2 to -0.1]), total cholesterol (-22.2 mg•dL-1 [-36.0 to -8.4]), no-HDL-cholesterol (-17.5 mg•dL-1 [-30.5 to -4.5]), LDL-cholesterol (-14.9 mg•dL-1 [-23.6 to -6.2]) and VO2max (5.7 ml•kg-1•min-1 [2.8 to 8.6]) in MOD. Study 2 showed no evidence of differences between groups. Our results therefore, suggest positive health effects of recreational football even when performed at low frequency as it can happen in real context
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