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Pesquisa : G01.374.618 [Categoria DeCS]
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Id: biblio-867333
Autor: Piva, Luana Caroline.
Título: Avaliação do coeficiente de atrito entre braquetes cerâmicos convencionais e os autoligados / Friction coeficient assessment between conventional and ceramic bracktes self-ligating.
Fonte: Londrina; s.n; 2015. 57 fls p.
Idioma: pt.
Tese: Apresentada a Universidade Estadual de Londrina. Centro de Ciências da Saúde para obtenção do grau de Especialista.
Responsável: BR510.1 - Biblioteca Setorial da Clínica Odontológica


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Id: biblio-866856
Autor: Clavijo, Victor Grover Rene.
Título: Resistência a extrusão de retentores intra-radiculares de fibra de vidro avaliando: técnica de confecção e cimento resinoso / Resistance to extrusion of intracanal retainers fiberglass evaluated: technical preparation and resin cement.
Fonte: Araraquara; s.n; 2011. 150 p. ilus.
Idioma: pt.
Tese: Apresentada a Universidade Estadual Paulista. Faculdade de Odontologia para obtenção do grau de Doutor.
Resumo: Neste estudo avaliou-se a resistência ao cisalhamento por extrusão de pinos de fibra de vidro, reembasados ou não com compósito, cimentados com dois tipos de cimentos resinosos em dentina intra-radicular, avaliando os segmentos cervical, médio e apical. Selecionaram-se 40 incisivos bovinos com dimensões semelhantes, removendo a porção coronária, padronizando o comprimento das raízes em 14 mm. Após, incluiu-se as raízes em resina acrílica, realizando tratamento endodôntico e, então o preparo dos espaços para os pinos, dividindo- as, em seguida, aleatoriamente em quatro grupos com dez amostras cada. Os elementos do grupo 1 receberam retentores de fibra de vidro cimentados com cimento resinoso RelyX ARC, grupo 2 retentores de fibra de vidro cimentados com cimento resinoso RelyX U100, grupo 3 retentores de fibra de vidro reembasados com resina composta e cimentados com cimento resinoso RelyX ARC e grupo 4 retentores de fibra de vidro reembasados com resina composta e cimentados com cimento resinoso RelyX U100. Ao término dos procedimentos de cimentação, realizou-se a secção dos segmentos radiculares, submetendo, então, os corpos-de-prova ao teste push-out em máquina de ensaios universal, através de ponta ativa cilíndrica com 1 mm de diâmetro, à velocidade de 0,5 mm/min, até extrusão do retentor. Obteve-se os seguintes valores médios de resistência de união, em MPa: grupo 1, terços cervical = 6,22 ± 2,64(a), médio = 4,25 ± 2,01(a) e apical = 4,45± 2,81(a); grupo 2, terços cervical = 5,04 ± 2,34(a), médio = 3,06 ± 2,12(a) e apical = 3,26 ± 2,38(a). grupo 3, terços cervical = 11,85 ± 1,67(b), médio = 11,83 ± 3,84(b) e apical = 10,39 ± 2,44(b). grupo 4, terços cervical = 12,05 ± 1,14(b), médio = 11,98 ± 3,23(b) e apical = 10,96 ± 2,14(b). Submeteram-se os valores à análise de variância e ao teste de Tukey com nível de significância de 5% indicadas...

This study evaluated the bond strength of fiber posts, relined or not with composite resin, luted with resinous cement to radicular dentin, evaluating cervical, median and apical root segments. Fourty bovine incisors, with similar dimensions, were selected and cut 16 mm from the apical limit. The roots were embedded in acrylic resin and the radicular canals were root treated and post space prepared with a depth of 9 mm. Samples were randomly assigned to two groups of ten roots each. Group 1 received glass fiber posts luted with dual-cure resin cement RelyX ARC in association with a bonding system. In Group 2 the same type of posts were relined with composite for further cementation with resin cement RelyX U100. In Group 3, glass fiber post were relined with composite and cemented with resin cement RelyX ARC and in Group 4 glass fiber posts were relined ith composite and cemented with resin cement RelyX U100. After cementation procedures roots were sectioned transversally and three sections, from cervical, medium and apical thirds were obtained. Push-out test was performed in a universal testing machine with a 1 mm diameter steel rod at cross-head speed of 0,5 mm/min until post extrusion. Collected data was statistically analyzed by two- way ANOVA and Tukey HSD test (p<0,05). The measured retention strengths for cervical, medium and apical thirds were: Group 1, cervical thirds = 6,22 ± 2,64(a), medium = 4,25 ± 2,01(a) e apical = 4,45± 2,81(a); group 2, cervical thirds = 5,04 ± 2,34(a), medium = 3,06 ± 2,12(a) and apical = 3,26 ± 2,38(a). Group 3, cervical thirds = 11,85 ± 1,67(b), medium = 11,83 ± 3,84(b) and apical = 10,39 ± 2,44(b). Group 4, cervical thirds = 12,05 ± 1,14(b), medium = 11,98 ± 3,23(b) and apical = 10,96 ± 2,14(b). Glass fiber composite relined posts presented statistically higher retention values in cervical, medium and apical thirds when compared...
Responsável: BR39.2 - Biblioteca Professora Maria Dilma de Oliveira Gonçalves
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Id: biblio-834217
Autor: Gómez, Sandra Liliana; Montoya, Yesid; García, Nora L; Virgen, Ana L; Botero, Javier E.
Título: Comparison of frictional resistance among conventional active and passive solf-ligating brackets with different combinations of arch wires: a finite element study
Fonte: Acta odontol. latinoam;29(2):130-136, 2016. ilus, tab.
Idioma: en.
Resumo: The aim of this study was to compare frictional resistance among conventional, passive and active selfligating brackets using Finite Elements Analysis (FEA). Seventynine (79) slide tests were performed by combining an upper first bicuspid conventional bracket, 0.018” stainless steel wires and 0.010” ligature by means of an INSTRON 3345 load system to obtain average maximum static frictional resistance (MSFR). This value was compared to the FR (frictional resistance) obtained by simulation of a slide of the same combination by FEA following conventional bracket modeling by means of Computer Aided Design (CAD). Once the FEA was validated, bracket CADs were designed (upper right first bicuspid conventional, active and passive selfligating bracket) and bracket properties calculated. MSFR was compared among conventional, active and passive selfligating brackets with different alloys and archwire cross sections such as 0.018”, 0.019” x 0.025”and 0.020” x 0.020”. Passive selfligating brackets had the lowest MSFR, followed by conventional brackets and active selfligating brackets. In conventional brackets, a 0.018” archwire produced a linear pattern of stress with maximum concentration at the center. Conversely, stress in 0.020 x 0.020” and 0.019 x 0.025” archwires was distributed across the width of the slot. The highest normal forces were 1.53 N for the 0.018” archwire, 4.85 N for the 0.020 x 0.020” archwire and 8.18 N for the 0.019 x 0.025” archwire. Passive selfligating brackets presented less frictional resistance than conventional and active selfligating brackets. Regardless of bracket type, greater contact area between the slot and the archwire and the spring clip increased frictional resistance.

El objetivo de este estudio fue comparar la resistencia friccional entre brackets convencionales, de autoligado pasivo y activo por medio del método de elementos finitos (MEF). Se realizaron setenta y nueve (79) deslizamientos combinando brackets convencionales de primer bicúspide superior con arcos de acero de 0,018” y ligadura metálica de 0,010” en una máquina INSTRON 3345, obteniendo el promedio de la resistencia estática máxima (REM). Este valor fue comparado con la resistencia friccional obtenida por simulación de un deslizamiento de la misma combinación por medio de MEF previo diseño asistido por computador (CAD) del bracket convencional. Una vez se validó MEF, se realizaron diseños CAD de los brackets (convencional, autoligado activo y pasivo de primer bicúspide superior derecho) y cálculos de sus propiedades. Se realizó una comparación entre brackets convencionales, brackets de autoligado activo y pasivo con diferentes aleaciones y secciones cruzadas de alambre 0.018”, 0.019” x 0.025” y 0.020” x 0.020”. Los brackets de autoligado pasivo mostraron la menor REM, seguidos de los brackets convencionales y finalmente los brackets de autoligado activo. En los brackets convencionales, el arco de 0,018” produjo un patrón lineal de stress en el fondo de la ranura, con su máxima concentración en el centro. Por el contrario, los arcos de 0.020” x 0.020” y 0.019 x 0.025” tuvieron una distribución de esfuerzos a través del ancho de la ranura. La mayor fuerza normal en los brackets convencionales fue para el arco 0.019”x 0.025” (8.18N), seguido por el arco 0.020 x 0.020” (4.85N) y finalmente el arco 0.018” (1.53N). Los brackets de autoligado pasivo presentaron menos resistencia friccional que los brackets convencionales y autoligado activo respectivamente. Independiente del tipo de bracket, una mayor área de contacto entre la ranura del bracket y el arco, y el spring clip aumentaron la resistencia friccional.
Responsável: AR29.1 - Biblioteca


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Id: lil-777271
Autor: CASTRO, Carolina Guimarães; ZANCOPÉ, Karla; VERÍSSIMO, Crisnicaw; SOARES, Carlos José; NEVES, Flávio Domingues das.
Título: Strain analysis of different diameter Morse taper implants under overloading compressive conditions
Fonte: Braz. oral res. (Online);29(1):1-6, 2015. tab, ilus.
Idioma: en.
Resumo: The aim of this study was to evaluate the amount of deformation from compression caused by different diameters of Morse taper implants and the residual deformation after load removal. Thirty Morse taper implants lacking external threads were divided into 3 groups (n = 10) according to their diameter as follows: 3.5 mm, 4.0 mm and 5.0 mm. Two-piece abutments were fixed into the implants, and the samples were subjected to compressive axial loading up to 1500 N of force. During the test, one strain gauge remained fixed to the cervical portion of each implant to measure the strain variation. The strain values were recorded at two different time points: at the maximum load (1500 N) and 60 seconds after load removal. To calculate the strain at the implant/abutment interface, a mathematical formula was applied. Data were analyzed using a one-way Anova and Tukey’s test (α = 0.05). The 5.0 mm diameter implant showed a significantly lower strain (650.5 μS ± 170.0) than the 4.0 mm group (1170.2 μS ± 374.7) and the 3.5 mm group (1388.1 μS ± 326.6) (p < 0.001), regardless of the load presence. The strain values decreased by approximately 50% after removal of the load, regardless of the implant diameter. The 5.0 mm implant showed a significantly lower strain at the implant/abutment interface (943.4 μS ± 504.5) than the 4.0 mm group (1057.4 μS ± 681.3) and the 3.5 mm group (1159.6 μS ± 425.9) (p < 0.001). According to the results of this study, the diameter influenced the strain around the internal and external walls of the cervical region of Morse taper implants; all diameters demonstrated clinically acceptable values of strain.
Responsável: BR1.1 - BIREME


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Id: lil-774112
Autor: Lima, Mariana Nunes Lyra.
Título: Avaliação do atrito produzido entre braquetes metálicos convencionais e autoligados ativos / Evolution of friction produced between active metal self-lligating brackets and conventional brackets.
Fonte: Londrina; s.n; 2015. 47 fls p. ilus, tab.
Idioma: pt.
Tese: Apresentada a Universidade Estadual de Londrina. Centro de Ciências da Saúde para obtenção do grau de Especialista.
Resumo: O presente trabalho teve como objetivo verificar se haveria na resistência friccional produzida entre os braquetes metálicos autoligados e os convencionais associados à ligadura elástica. Foram confeccionados trinta corpos de prova, sendo metade composta pro braquetes autoligados e o restante pelos convencionais. Cada corpo de prova era composto por um braquete e dois tubos metálicos alinhados, colados com resina composta em uma placa de vidro de microscopia a uma distância de 10mm entre eles. Para cada corpo de prova, uma secção de 8 cm de fio ortodôndtico 0.019" X 0.025" de aço inoxidável, contendo um helicóide em uma das extremidades era confeccionada, encaixada nos braquetes e, no caso dos braquetes convencionais, amarradas com ligadura elástica. Os fios eram então tracionados por uma máquina para ensaios de tração e os valores da carga máxima necessária para produzir o seu deslizamento, registrados. Os dados foram submetidos a tratamento estatístico, podendo-se concluir que houve diferença estatisticamente significante na resistência fricional, sendo esta menor nos braquetes autoligados do que nos convencionais...
Responsável: BR510.1 - Biblioteca Setorial da Clínica Odontológica


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Id: lil-768256
Autor: LIANG, Xue; ZHANG, Jing Yang; CHENG, Iek Ka; LI, Ji Yao.
Título: Effect of high energy X-ray irradiation on the nano-mechanical properties of human enamel and dentine
Fonte: Braz. oral res. (Online);30(1):e9, 2016. tab, graf.
Idioma: en.
Projeto: Special Fund for Health Research in the Public interest.
Resumo: Abstract Radiotherapy for malignancies in the head and neck can cause common complications that can result in tooth damage that are also known as radiation caries. The aim of this study was to examine damage to the surface topography and calculate changes in friction behavior and the nano-mechanical properties (elastic modulus, nanohardness and friction coefficient) of enamel and dentine from extracted human third molars caused by exposure to radiation. Enamel and dentine samples from 50 human third molars were randomly assigned to four test groups or a control group. The test groups were exposed to high energy X-rays at 2 Gy/day, 5 days/week for 5 days (10 Gy group), 15 days (30 Gy group), 25 days (50 Gy group), 35 days (70 Gy group); the control group was not exposed. The nanohardness, elastic modulus, and friction coefficient were analyzed using a Hysitron Triboindenter. The nano-mechanical properties of both enamel and dentine showed significant dose-response relationships. The nanohardness and elastic modulus were most variable between 30-50 Gy, while the friction coefficient was most variable between 0-10 Gy for dentine and 30-50 Gy for enamel. After exposure to X-rays, the fracture resistance of the teeth clearly decreased (rapidly increasing friction coefficient with increasing doses under the same load), and they were more fragile. These nano-mechanical changes in dental hard tissue may increase the susceptibility to caries. Radiotherapy caused nano-mechanical changes in dentine and enamel that were dose related. The key doses were 30-50 Gy and the key time points occurred during the 15th-25th days of treatment, which is when application of measures to prevent radiation caries should be considered.
Responsável: BR1.1 - BIREME


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Id: lil-763053
Autor: Günes, Mustafa; Keles, Muzaffer Oguz; Kaya, Cevdet; Koca, Orhan; Sertkaya, Zülfü; Akyüz, Mehmet; Altok, Muammer; Umul, Mehmet; Karaman, Muhammet Ihsan.
Título: Does resectoscope size play a role in formation of urethral stricture following transurethral prostate resection?
Fonte: Int. braz. j. urol;41(4):744-749, July-Aug. 2015. tab.
Idioma: en.
Resumo: ABSTRACTBackground and aims:To investigate the possible effect of resectoscope size on urethral stricture rate after monopolar TURP.Materials and Methods:A retrospective study of 71 men undergoing TURP was conducted at two centers’ from November 2009 to May 2013. The patients were divided into one of two groups according to the resectoscope diameter used for TURP. Resectoscope diameter was 24 F in group 1 (n=35) or 26 F in group 2 (n=36). Urethral catheter type, catheter removal time and energy type were kept constant for all patients. Urethral stricture formation in different localizations after TURP was compared between groups.Results:There was no significant difference between the two groups in terms of age, pre-operative prostate gland volume (PV), prostate-specific antigen (PSA), maximal urinary flow rates (Qmax), International Prostate Symptom Score (IPSS) and post-voiding residual urine volume (PVR). The resection time and weight of resected prostate tissue were similar for both groups (p>0.05). A statistically significant higher incidence of bulbar stricture was detected in group 2 compared to group1 (p=0.018).Conclusions:The use of small-diameter resectoscope shafts may cause a reduction in the incidence of uretral strictures in relation to urethral friction and mucosal damage.
Responsável: BR1.1 - BIREME


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Id: lil-751134
Autor: Geremia, Jean Rafael; Oliveira, Pablo Santos de; Motta, Rogério Heládio Lopes.
Título: Comparação da força de atrito entre bráquetes autoligados e bráquetes convencionais com diferentes ligaduras / Comparison of friction among self-ligating brackets and conventional brackets with different ligadures
Fonte: Ortho Sci., Orthod. sci. pract;8(29):30-37, 2015. ilus, graf.
Idioma: pt.
Resumo: O objetivo do presente trabalho foi comparar a força máxima, força de atrito estática e dinâmica existente entre bráquetes de aço inoxidável autoligados passivos da marca EasyClip® (Aditek®), bráquetes de aço inoxidável convencionais Morelli® (Dental Morelli®) ligados com ligaduras elastoméricas convencionais (Dental Morelli®) e com ligaduras elastoméricas não convencionais com desenhos “8” e “88” (Tecnident®). Foi utilizado um dispositivo que permite a movimentação de deslize do fio (aço inoxidável 0,019 X 0,025 polegadas - Morelli®) de forma perpendicular aos slots dos bráquetes alinhados, sem nenhuma possível interferência externa. Uma máquina de testes universal (EMIC DL2000) foi utilizada para o tracionamento dos fios e transformação em dados computadorizados. Esses dados foram transformados e submetidos aos testes de Kolmogorov & Smirnov, e ao teste de Bartlett, depois submetidos às análises não paramétricas Kruskal-Wallis e SNK. Nesse estudo, bráquetes autoligados e bráquetes convencionais com elásticos não convencionais “8” e “88” reduzem o atrito na mecânica de deslize em relação aos módulos elastoméricos convencionais (P<.05).

The aim of the present work was to compare maximum force, static and dynamic friction forces between three different types of brackets: passive stainless steel self-ligating brackets from EasyClip® (Aditek®), conventional Morelli® stainless steel brackets (Dental Morelli®) ligated with conventional elastometric ligatures (Dental Morelli®), and with nonconventional elastomeric ligatures “8” and“88” (Tecnident®). A device that allows the slippage of the wire (stainless steel 0.019 X 0.025 inches - Morelli®) perpendicular to the slots of the aligned brackets with no external interference. A universal testing machine (EMIC DL2000) was used to traction the wire and convert it intocomputerized data. These data were submitted to Kolmogorov & Smirnov tests and to Bartlett test, and then to Nonparametric Tests-Kruskal-Wallis and SNK tests. In the present study it was observed that selfligated brackets and conventional brackets with nonconventional “8” and “88” elastics reduce the friction of sliding mechanics when compared to conventional elastometric modules (P<.05).
Responsável: BR243.1 - Serviço Técnico de Biblioteca e Documentação


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Id: lil-748148
Autor: Silveira, Mara Graziele Maciel; Sousa, Antônio Carlos Sobral; Santos, Marcos Antônio Almeida; Tavares, Irlaneide da Silva; Andrade, Stephanie Macedo; Melo, Luiza Dantas; Andrade, Loren Suyane Oliveira de; Santos, Emmanuel Lima Almeida; Oliveira, Joselina Luzia Menezes.
Título: Assessment of Myocardial Ischemia in Obese Individuals Undergoing Physical Stress Echocardiography (PSE) / Avaliação da Isquemia Miocárdica em Obesos Submetidos à Ecocardiografia sob Estresse Físico
Fonte: Arq. bras. cardiol;104(5):394-400, 05/2015. tab, graf.
Idioma: en.
Resumo: Background: Physical stress echocardiography is an established methodology for diagnosis and risk stratification of coronary artery disease in patients with physical capacity. In obese (body mass index ≥ 30 kg/m2) the usefulness of pharmacological stress echocardiography has been demonstrated; however, has not been reported the use of physical stress echocardiography in this growing population group. Objective: To assess the frequency of myocardial ischemia in obese and non-obese patients undergoing physical stress echocardiography and compare their clinical and echocardiographic differences. Methods: 4,050 patients who underwent treadmill physical stress echocardiography were studied according to the Bruce protocol, divided into two groups: obese (n = 945; 23.3%) and non-obese (n = 3,105; 76.6%). Results: There was no difference regarding gender. Obese patients were younger (55.4 ± 10.9 vs. 57.56 ± 11.67) and had a higher frequency of hypertension (75.2% vs. 57, 2%; p < 0.0001), diabetis mellitus (15.2% vs. 10.9%; p < 0.0001), dyslipidemia (59.5% vs 51.9%; p < 0.0001), family history of coronary artery disease (59.3% vs. 55.1%; p = 0.023) and physical inactivity (71.4% vs. 52.9%, p < 0.0001). The obese had greater aortic dimensions (3.27 vs. 3.14 cm; p < 0.0001), left atrium (3.97 vs. 3.72 cm; p < 0.0001) and the relative thickness of the ventricule (33.7 vs. 32.8 cm; p < 0.0001). Regarding the presence of myocardial ischemia, there was no difference between groups (19% vs. 17.9%; p = 0.41). In adjusted logistic regression, the presence of myocardial ischemia remained independently associated with age, female gender, diabetes and hypertension. Conclusion: Obesity did not behave as a predictor of the presence of ischemia and the physical stress echocardiography. The application of this assessment tool in large scale sample demonstrates the feasibility of the methodology, also in obese. .

Fundamento: A ecocardiografia sob estresse físico é a metodologia estabelecida para diagnóstico e estratificação de risco de doença arterial coronária em pacientes com capacidade física preservada. Em obesos (índice de massa coporal ≥ 30 kg/m2), já foi demonstrada a utilidade da ecocardiografia sob estresse farmacológico. Todavia, não tem sido relatado o uso da ecocardiografia sob estresse físico nesse grupo crescente da população. Objetivo: Avaliar a frequência de isquemia miocárdica em obesos e não obesos submetidos à ecocardiografia sob estresse físico, e comparar suas diferenças clínicas e ecocardiográficas. Métodos: Foram estudados 4.050 pacientes, submetidos à ecocardiografia sob estresse físico em esteira ergométrica, segundo o protocolo de Bruce, divididos em dois grupos: obesos (n = 945; 23,3%) e não obesos (n = 3.105; 76,6%). Resultados: Não houve diferença quanto ao sexo. Os obesos foram mais jovens (55,4 ± 10,9 anos vs. 57,56 ± 11,7 anos) e apresentaram maior frequência de hipertensão arterial sistêmica (75,2% vs. 57,2%; p < 0,0001), diabetes melito (15,2% vs. 10,9%; p < 0,0001), dislipidemia (59,5% vs. 51,9%; p < 0,0001), antecedentes familiares para doença arterial coronária (59,3% vs. 55,1%; p = 0,023) e de sedentarismo (71,4% vs. 52,9%; p < 0,0001). Os obesos apresentaram maiores dimensões da aorta (3,27 vs. 3,14 cm; p < 0,0001) do átrio esquerdo (3,97 vs. 3,72 cm; p < 0,0001) e da espessura relativa do ventrículo esquerdo (33,7cm vs. 32,8 cm; p < 0,0001). Quanto à presença de isquemia miocárdica, não houve diferença entre os grupos (19% vs. 17,9%; p = 0,41). Na regressão logística ajustada, isquemia miocárdica permaneceu associada de maneira independente a idade, sexo feminino, diabetes melito e hipertensão arterial sistêmica. Conclusão: A obesidade não se comportou como fator preditor de presença de isquemia à ecocardiografia sob estresse físico. A aplicação desse instrumento de avaliação ...
Responsável: BR1.1 - BIREME


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Id: lil-731498
Autor: Pereira, Dimitri W; Nista-Piccolo, Vilma L.
Título: Escalada: um esporte na ponta dos dedos / Climbing: a sport at your fingertips
Fonte: Rev. bras. ciênc. mov;18(1):73-80, jan.-mar. 2010.
Idioma: pt.
Resumo: A escalada esportiva é uma modalidade derivada do montanhismo cujo objetivo é subir paredes com até 50 metros de altura de grande dificuldade técnica. Ela tem regras específicas e pode ser competitiva. Esse estudo pretende discutir os aspectos da escalada de alto rendimento utilizando a revisão de literatura sobre esse assunto pouco explorado na educação física. Pesquisas mostram tanto as características de treinamento quanto as lesões geradas pelos excessos de prática, os processos mentais também podem determinar o sucesso, pois estar pendurado na ponta dos dedos a metros do chão exige auto controle e superação. Essas são algumas conclusões desse estudo que necessita maiores investigações.

Climbing is a sport derived from the mountaineering sport whose goal is to climb walls with up to 50 meters in height of great technical difficulty. It has specific rules and can be competitive. This study aims to discuss aspects of sport climbing of high performance using the review of literature on this subject few explored in the physical education. Researches show both the haracteristics of training in the lesions caused by over use, mental processes may also etermine the success, it is hanging at your fingertips meters to the ground requires self control and overcome. These are some conclusions that this study who needs more investigations.
Responsável: BR1552.1 - Biblioteca Central



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