165 resultados para Rigidez


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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Este trabalho objetivou verificar se o ultrassom de baixa potência (US) previne a ocorrência de osteopenia em tíbias de ratos sob ausência de carga. Foram utilizados 45 Rattus novergicus albinus, Wistar adultos, machos, distribuídos em cinco grupos iguais: C - animais-controle livres em gaiolas por 21 dias; S - animais suspensos pela cauda por 21 dias; ST - suspensos pela cauda por 21 dias e concomitantemente tratados com US; S→C - suspensos por 21 dias e depois permanecendo livres em gaiolas por mais 21 dias; S→CT - suspensos por 21 dias e depois permanecendo livres em gaiolas por mais 21 dias e concomitantemente tratados com US. O tratamento foi realizado com US de 1,5MHz, ciclo de trabalho 1:4, 30mW/cm², na tíbia direita, por 15 sessões de 20 minutos cada, cinco sessões por semana. Ainda vivos, os animais foram submetidos a exame de densitometria óssea para verificação da densidade mineral óssea (DMO) e do conteúdo mineral ósseo (CMO). Após a eutanásia dos animais, as tíbias foram desarticuladas, dissecadas e submetidas a ensaio mecânico destrutivo para análise da força máxima (Fmáx) e da rigidez (R). Foram avaliados também o comprimento (L) e o diâmetro (D) no ponto médio da tíbia. O grupo S apresentou valores de DMO, CMO, Fmáx, R, L e D menores em relação ao grupo C, demonstrando que a suspensão pela cauda é prejudicial a estas variáveis. O tratamento dos animais suspensos com o US, grupo ST, elevou os valores de CMO e DMO em relação aos do grupo S, igualando-os aos do grupo C. A Fmáx, R e L do grupo ST aumentou em relação ao grupo S e também em relação ao grupo C (p<0,05). Nenhuma diferença significativa foi encontrada entre as variáveis analisadas para os grupos S→CT e S→C (p>0,05). Os resultados obtidos neste estudo permitem concluir que o US de baixa potência contribuiu na prevenção e reversão da ocorrência da osteopenia nos animais submetidos à suspensão pela cauda, demonstrando que a ausência do estímulo mecânico causada pela impossibilidade da deambulação pode ser minimizada pela ação mecânica deste.

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High-density polyethylene (HDPE) water-proof membranes are used as coatings in vinasse (leachate from sugar cane) storage tanks. The leachate is pumped into the tanks at temperatures of 80-90 °C. Due to these high temperatures and acidity of the waste, these membranes can be degraded, cracked and then loose the function for which they have been designed. This may cause contamination of the soil and groundwater. This study evaluated the effect of vinasse in HDPE membranes after 4 months of exposure in a controlled environment. An aggressive, alkaline pH liquid (sodium hydroxide) was also used. The objective was to evaluate the membrane resistance in contact with acidic and alkaline residues. Physical and mechanical tests, measurement of the carbon black content and thermo gravimetric analysis (TGA) were used to determine degradation of polymer membranes after chemical immersion. While sodium hydroxide resulted caused only minor changes in the physical properties, vinasse induced a thickness change of 7.8%. With immersion in vinasse, an average decrease in strength and deformability (yield) of 34% and 23.5% were measured, respectively. The stiffness increased by 7.8% (average) and the tear strength decreased by 2.7% (average).

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Pós-graduação em Cirurgia Veterinária - FCAV

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Pós-graduação em Engenharia Elétrica - FEIS

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Introduction: Parkinson’s disease (PD) is a chronic disease of the nervous system, characterized by degeneration of neurons in the mesencephalic substantia nigra, leading to a clinical state of rest tremor, bradykinesia, muscular rigidity and postural instability. Physical therapy seeks to act by slowing the progression of the disease and when done in a group and maintain and / or improving the motor skills of the individual, can provide psychosocial benefi ts. Objective: examine the infl uence of the physical therapy group in balance, functional mobility and quality of life of individuals with PD. Method: participated in this study 04 subjects were female, mean age 67.75 (± 9.5) years, with medical diagnosis of PD, stages 1 to 3 of the Hoehn & Yahr. Before starting treatment, subjects underwent an assessment of the balance (BBS), functional mobility (TUG) and the quality of life (PDQ-39).The treatment was performed in groups, for a period of 10 weeks, lasting 60 minutes each session twice a week, totaling 20 sessions of physiotherapy. Upon completion of the treatment period the subjects were again assessed for balance, functional mobility and quality of life. The data were analyzed using the Student t-test, with signifi cance level of 5% (p ≤ 0.05). Results: statistical analysis showed signifi cant differences in three variables: equilibrium (p = 0.010), functional mobility (p = 0.029) and quality of life (p = 0.004), after physiotherapy intervention. Conclusion: physiotherapy treatment was group provides better balance, functional mobility and quality of life of patients with PD.

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Introduction: Parkinson’s disease is a chronic disease of the nervous system that leads to a clinical picture of resting tremor, bradykinesia, muscular rigidity and postural instability. These symptoms, in turn, directly influence the functional independence of the individual. Objective: To analyze the influence of muscle strengthening on functional independence of individuals with Parkinson’s disease. Method: A total of ten subjects of both genders participated in this study. We evaluated the functional independence, strength of lower limbs, grip strength testing and 1 repetition maximum. After the evaluation was performed muscle building program for 12 weeks. Results: There was improvement of functional independence (p = 0.007) and lower limb strength (p = 0.01), as well as an increase in grip strength, both of the dominant hand (p = 0.007) and the non-dominant one (p = 0.02). Conclusion: The muscle strength improved the functional independence of individuals with PD.

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Introduction: Parkinson’s Disease (PD) is characterized by a set of four motor symptoms: tremor, rigidity, bradykinesia and postural instability. These defi cits may predispose individuals to limitations resulting from falls and their secondary consequences. Objective: To evaluate the functional balance and quality of life (QoL) in individuals with PD and determine whether there is correlation between performance on tests of balance with the QoL. Method: The project was referred to the Ethics Committee in Research of Universidade Estadual Paulista “Julio de Mesquita Filho” Campus de Marília and was approved under protocol number 1806/09. Participated in this study with individuals diagnosed with PD between levels one and four in the Hoen and Yahr scale. The subjects were evaluated according to functional balance and QoL, respectively by the instruments: Functional Balance Scale Berg (EEFB), Time Up and Go test (TUG), and Parkinson’s Disease Questionnaire-39 (PDQ-39). To perform the statistical analysis used the GraphPad Prism 5. To perform the correlation analysis for the variables passed normality by the Shapiro-Wilk. Since the variables were non-parametric test was used Spearman. During the analysis the statistical signifi cance level was considered p ≤ 0, 05. Results: We studied 25 individuals aged between 54 and 85 years (71.20 ± 8.50), time of diagnosis between one and 39 years (6.54 ± 7.71) disease. Moderate correlation was found between the EEFB with QoL (r =- 0.6), and TUG with QoL (r = 0.6836). Among the aspects of QoL balance showed a higher correlation with the domains “mobility” (TUG r = 0, 6768; EEFB r = -0.6155) and “Activities of daily living” (TUG r = 0, 7357, and EEFB r = -0.6521). Conclusion: Patients with Parkinson’s disease show defi cits in balance and QoL. The balance disorders have a high correlation among themselves and show how aspects of QoL.

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Rheumatoid arthritis (RA) is a chronic illness with great potential to cause comorbidities resulting from cumulative inflammatory activities, and it contributes with the increase of disabilities and death of patients. It affects 1 to 2% of world population and usually occurs between 30 and 50 years of age. Among existing therapeutic options for the disease non-steroidal anti-inflammatory drugs (NSAIDs) still play an important part in the treatment, being widely used by patients to relieve pain and stiffness. However, this class of drugs causes many adverse gastrointestinal effects, such as dyspepsia, heartburn, nausea and vomit, and its use is one of the most common causes of peptic ulcers. Mangiferin (a glicosilated xanthone extracted mainly from the bark of Mangifera indica L.) is the main compound of an aqueous extract made from the bark stem of the mango tree. Previous studies conducted by our research group prove the anti-inflammatory action of mangiferin on an animal model of periodontitis, and its gastroprotective action has been described before. Considering these informations this study evaluated mangiferin’s potential on the treatment of RA and on gastric ulcer healing in animal models, and analyzed toxicity parameters to assure efficacy and safety of the compound as potential new drug for the treatment of the disease. RA was induced in rats by subcutaneous injection of bovine collagen and Freund’s complete adjuvant. This method presented low incidence of RA in rats, but we were able to induce the disease in 60 to 70% of the animals. Due to the wide use of NSAIDs and its potential to cause peptic ulcers, we induced gastric ulcer on arthritic rats to analyze mangiferin’s gastric healing effect. After 14 days of treatment we noticed small increase of the lesion area of animals treated with mangiferin or ibuprofen, when compared to the animals... (Complete abstract click electronic access below)

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This work intends to perform the dimensioning of the Guaratinguetá’s Engineering College Baja SAE vehicle suspension system. To do so, concepts of suspension systems, human comfort limits to vibrations and automotive models for suspension vibration analyses are reviewed. On the development of this work descriptions of considerations specific for the vehicle object of this work are made as well as descriptions of the experiment made to determine the stiffness of the tire used. These concepts are applied through a computational routine that allows the dimensioning of springs and shock absorbers of both front and rear axles of a vehicle in a way to respect all the criteria showed during this work and visualize the system’s behavior when excited on different frequencies