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Search Results: 1 - 10 of 159112 matches for " Hélder; Fernandes "
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A rela??o entre a percep??o de competência física, índice de massa corporal e competência efectiva em jovens praticantes de Basquetebol
Ferreira,Sandro; Fernandes,Hélder M.; Raposo,José Vasconcelos;
Motricidade , 2007,
Abstract: the purposes of this study were: (i) explore the relationship between body mass index (bmi) and perceived physical competence (ppc), and/or effective basketball competence (ecb); (ii) understand the relationship between ppc and ecb; and, (iii) establish the sources of information that the young use to define the ppc. a sample of 156 physical education students, with ages ranging from 12 to 18 years (m=14.36; sd=1.76), completed the perception of physical competence subscale (ppcs) and the physical competence source?s subscale (pcss). they also realized a protocol to measure effective competence in basketball. the main results revealed: (i) significant differences between boys and girls, while comparing bmi, with higher mean scores for boys; (ii) higher mean scores of ppc and bec for boys; (iii) significant differences for the following constructs of the pcss: pre-competition anxiety and sport attraction; and, (iv) significant differences between different groups of ages, for parent?s evaluation factor.
Surgical management of intramedullary spinal ependymomas
Joaquim, Andrei Fernandes;Santos, Marcos Juliano dos;Tedeschi, Hélder;
Arquivos de Neuro-Psiquiatria , 2009, DOI: 10.1590/S0004-282X2009000200021
Abstract: background: spinal intramedullary ependymoma is a rare disease with a wide range of clinical presentation, generally requiring surgical treatment. objective: report our experience and present our surgical technique to achieve total resection and cure. method: we present 12 consecutive cases of intramedullary ependymomas operated between 2000 and 2008 by the senior author (ht). the functional scale proposed by mccormick was used to evaluate the patients' neurological status. results: age at presentation varied from 18 to 55 (average 36) years. all tumors had a benign histology. four (33%) patients were male and eight (67%) were female. according to the site of presentation, six (50%) were localized at the cervical region (including two at the cervicomedullary junction, two at the cervico-thoracic junction and two exclusively at the cervical level), four at the thoracic level and two at the conus/ cauda equina. dyshestesia was a common finding at the neurological exam in eight patients (67%). total resection was achieved in all cases. six patients showed neurological improvement postoperatively, whereas the other six remained stable. conclusion: adequate knowledge of anatomy and the correct use of microsurgical techniques allowed total resection of these tumors with minimal morbidity and maximum functional recovery.
Abordagem cirúrgica dos hemangioblastomas intramedulares
Joaquim, Andrei Fernandes;Santos, Marcos Juliano dos;Tedeschi, Hélder;
Coluna/Columna , 2009, DOI: 10.1590/S1808-18512009000300007
Abstract: objectives: to report an experience and to present a surgical technique to achieve total resection and cure. methods: nine consecutive cases of intramedullary haemangioblastomas, operated between 2000 and 2008 are presented. the functional scale proposed by mccormick was used to evaluate the patients' neurological status. results: age at presentation varied from 13 to 45 (average 27.1) years. four (44.4%) patients were male and five (55.5%), female. two patients had an associated von hippel-lindau disease, with others haemangioblastomas. according to the site of presentation, seven (77.7%) were localized at the cervical region (including two at the cervico-medullary junction), and two (22.2%) at the thoracic level. total resection was achieved in all cases. three patients had some functional worsening immediately after surgical procedure. after six months, there were no patients with functional worsening comparing with the pre-operative status and two patients had clinical improvement. conclusions: adequate knowledge of anatomy and the correct use of microsurgical techniques allowed total resection of these tumors with minimal morbidity and maximum functional recovery.
Terminologias Químicas na Libras: A Utiliza o de Sinais na Aprendizagem de Alunos Surdos.
Sinval Fernandes de Sousa,Hélder Eterno da Silveira
Química Nova na Escola , 2011,
Abstract: No presente trabalho, apresentamos reflex es e apontamentos sobre a utiliza o de sinais referentes àsterminologias químicas na língua brasileira de sinais. O trabalho revela a dificuldade dos professores de químicaem abordar esse conteúdo para pessoas com deficiência auditiva. Mostra ainda a rela o entre intérpretes, professorese alunos surdos, bem como o processo de apropria o e utiliza o de alguns sinais por alunos surdosem aulas de química na cidade de Uberlandia (MG) e suas rela es com os conceitos químicos.
Perfil psicológico de presta??o dos atletas paralímpicos Atenas 2007
Bodas,Ana Rita; Lázaro,Jo?o Paulo; Fernandes,Hélder Miguel;
Motricidade , 2007,
Abstract: the identification and comprehension of the psychological components which determine the differences between the high performance athletes at competition time, is absolutely necessary in order to choose the suitable interventions when coaching. the present study describes the identification of the psychological profiles that distinguish the athletes of different sport modalities and different disabilities, based on the psychological performance profile. the sample concerns 28 athletes (21 men and 7 women) from four sport modalities and three different kinds of disability. the age of the athletes ranged from 19 and 49 years old (m=31.14, sd=6.69), which represent the total athletes selected for the athens 2004 paralympic games, without any cognitive problems. the inventory used was that of the psychological performance profile, who takes into consideration the evaluation of seven psychological variables: self-confidence, negativism, positivism, attention, visualization, motivation and attitude control. the statistical procedures were based on descriptive, correlative and comparative analysis, with a significance level of 0.05. the main results showed high level of psychological preparation, regular for the variables: motivation (27.43+1.99), self-confidence (27.18+2.57) and attitude control (25.61+2.68), and non-regular for positivism (24.86+2.53), visualization (23.29+4.02), attention (23,07+3,36) and negativism (21.11+3.19). this study also found statistically important differences between paralympic athletes according to the kind of handicap, sportive modality and ranks.
Role of -Sulesomab Immunoscintigraphy in the Management of Infection following Deep Brain Stimulation Surgery
Raquel Real,Paulo Linhares,Hélder Fernandes,Maria José Rosas,Miguel F. Gago,Jorge Pereira,Rui Vaz
Neurology Research International , 2011, DOI: 10.1155/2011/817951
Abstract: Infection constitutes a serious adverse event in patients submitted to deep brain stimulation, often leading to removal of the device. We set to evaluate the potential role of immunoscintigraphy with -labelled antigranulocyte antibody fragments ( -sulesomab) in the management of infection following DBS. -sulesomab immunoscintigraphy seems to correlate well with the presence and extent of infection, thus contributing to differentiate between patients who should remove the hardware entirely at presentation and those who could undergo a more conservative approach. Also, -sulesomab immunoscintigraphy has a role in determining the most appropriate timing for reimplantation. Finally, we propose an algorithm for the management of infection following DBS surgery, based on the results of the -sulesomab immunoscintigraphy. 1. Introduction Deep brain stimulation (DBS) is an effective treatment option for a number of neurological disorders, including movement disorders, pain, and epilepsy [1–4]. Following DBS procedures, skin erosion and/or infection can occur, most commonly at the connector site [5, 6]. Infection constitutes a serious adverse event because it often leads to removal of the DBS system, with consequent loss of the clinical benefits of stimulation. Also, from an economical perspective, infection greatly adds to the costs of DBS treatment, as this complication often requires hospitalization, prolonged antibiotic therapy, and additional surgical procedures. Currently there are no guidelines that specifically address the issue of hardware-related infection. In a pooled analysis of ten studies concerning hardware-related complications of DBS, which included 922 patients, hardware removal was necessary in 80% of the patients who developed infections [5]. Nevertheless, reports of successful conservative treatment with antibiotics alone seem to indicate that removal of the stimulation device is not always necessary and that conservative treatment could be considered as first choice in cases of circumscribed extracranial hardware infections [7]. The evaluation of the true extent of the extracranial infection can be troublesome in clinical practice and the decision of which patients are candidates for a conservative medical approach in contrast to immediate surgical treatment is usually not sufficiently clear-cut. To address the issue of infection management following DBS surgery, we set to evaluate the potential role of immunoscintigraphy with 99mTc-labelled antigranulocyte antibody fragments (sulesomab) in the development of a rational therapeutic approach
Caracteriza??o dos niveis de ansiedade em praticantes de atletismo: Níveis de Ansiedade no Atletismo
Vasconcelos-Raposo,José; Lázaro,Jo?o P.; Teixeira,Carla; Mota,Maria P.; Fernandes,Hélder M.;
Motricidade , 2007,
Abstract: the purpose of this study was to characterize the levels of anxiety among young track and field athletes. the sample consisted of 147 athletes (89 males and 58 females). these were divided according to the independent variables defined for the present study, namely: competitive age-group, sport and ranking. the4 instruments used were the csai-2 and icpc. the statistical procedures used were the descriptive and correlation techniques. in general the results confirmed those obtained in prior studies. the results further suggested that the systematic use of the icpc by coaches may be an adequate way to better know the athletes they work with.
Influence of loading sequence and stress ratio on Fatigue damage accumulation of a structural component
Pereira,Hélder F. S. G.; Jesus,Abílio M.P. de; Ribeiro,Alfredo S.; Fernandes,António A.;
Ciência & Tecnologia dos Materiais , 2008,
Abstract: this paper presents experimental results about the fatigue damage accumulation behaviour of a structural component made of p355nl1 steel. the structural component is a rectangular double notched plate. two and multiple alternated constant amplitude block sequences were applied for various combinations of remote stress ranges. three stress ratios were investigated, namely r=0, r=0.15 and r=0.3. variable amplitude blocks were also investigated according predefined stress spectra. constant amplitude data was also generated which is applied for damage calculation purposes. in general, the block loading demonstrates that fatigue damage evolves nonlinearly with the number of loading cycles, function of the load sequence, stress level and stress ratios. generally, the application of variable amplitude loading suggests an important stress ratio effect on fatigue damage accumulation. in particular, a clear load sequence effect is verified for the two block loading, with null stress ratio. for the other (higher) stress ratios, the load sequence effects are almost negligible; however the damage evolution still is non-linear.
New Insights into the Mechanisms of Embryonic Stem Cell Self-Renewal under Hypoxia: A Multifactorial Analysis Approach
Hélder S. C. Barbosa, Tiago G. Fernandes, Tiago P. Dias, Maria Margarida Diogo, Joaquim M. S. Cabral
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0038963
Abstract: Previous reports have shown that culturing mouse embryonic stem (mES) cells at different oxygen tensions originated different cell proliferation patterns and commitment stages depending on which signaling pathways are activated or inhibited to support the pluripotency state. Herein we provide new insights into the mechanisms by which oxygen is influencing mES cell self-renewal and pluripotency. A multifactorial approach was developed to rationally evaluate the singular and interactive control of MEK/ERK pathway, GSK-3 inhibition, and LIF/STAT3 signaling at physiological and non-physiological oxygen tensions. Collectively, our methodology revealed a significant role of GSK-3-mediated signaling towards maintenance of mES cell pluripotency at lower O2 tensions. Given the central role of this signaling pathway, future studies will need to focus on the downstream mechanisms involved in ES cell self-renewal under such conditions, and ultimately how these findings impact human models of pluripotency.
Influence of loading sequence and stress ratio on Fatigue damage accumulation of a structural component
Hélder F. S. G. Pereira,Abílio M.P. de Jesus,Alfredo S. Ribeiro,António A. Fernandes
Ciência & Tecnologia dos Materiais , 2008,
Abstract: This paper presents experimental results about the fatigue damage accumulation behaviour of a structural component made of P355NL1 steel. The structural component is a rectangular double notched plate. Two and multiple alternated constant amplitude block sequences were applied for various combinations of remote stress ranges. Three stress ratios were investigated, namely R=0, R=0.15 and R=0.3. Variable amplitude blocks were also investigated according predefined stress spectra. Constant amplitude data was also generated which is applied for damage calculation purposes. In general, the block loading demonstrates that fatigue damage evolves nonlinearly with the number of loading cycles, function of the load sequence, stress level and stress ratios. Generally, the application of variable amplitude loading suggests an important stress ratio effect on fatigue damage accumulation. In particular, a clear load sequence effect is verified for the two block loading, with null stress ratio. For the other (higher) stress ratios, the load sequence effects are almost negligible; however the damage evolution still is non-linear. Este artigo apresenta resultados experimentais relativos à acumula o de dano de fadiga de um componente estrutural de a o P355NL1. O componente estrutural é uma placa rectangular com duplo entalhe. Foram aplicadas sequências de dois e múltiplos blocos de carga de amplitude constante, para várias combina es de raz es de tens o remotas, nomeadamente R=0, R=0.15 e R=0.3. Também foram analisados os efeitos da aplica o de blocos de amplitude variável, aplicados de acordo com um espectro de carga predefinido. Este estudo foi complementado com resultados de ensaios realizados em amplitude constante, os quais serviram para os cálculos de acumula o de dano. Em geral, o carregamento por blocos demonstra que o dano provocado por fadiga apresenta uma evolu o n o linear com o número de ciclos de carga, sendo esta evolu o de dano fun o da sequência de carga, do nível de tens o e da raz o de tens es. Geralmente, a aplica o de carregamentos de amplitude variável indicia um importante efeito da raz o de tens es na acumula o de dano por fadiga. Particularmente, é observado um efeito claro da sequência de carga nos carregamentos compostos por dois blocos de carga, com raz o de tens es nula. Para as outras raz es de tens es (altas), os efeitos da sequência de carga s o praticamente desprezáveis; contudo a evolu o de dano continua a ser n o linear.
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