The alongshore variability of beach-dune systems and the response and recovery from extreme storms remains poorly understood. The height and extent of foredunes along barrier islands varies over a range of spatial scales, implying that during extreme storms, the beach-dune system should respond in different ways depending on the elevation and volume of the dunes relative to the storm surge. The purpose of this study is to use Ground-Penetrating Radar (GPR) and vibra-cores to investigate the internal structure of small, intermediate and large dunes along a 2.5 km transect of beach in Padre Island National Seashore, TX with particular attention to storm impacts. A series of dune normal and parallel GPR profiles were collected to capture the variation in beach-dune morphology at the three sites. Site locations were chosen along a transition from dissipative to intermediate beach states. Following the Sallenger (2000) storm impact model, the small dune is defined by low-lying topography that is susceptible to overwash and inundation depending on the size of the storm surge. The large dune is characteristic of the “collision regime”, while the intermediate dune represents a transition between “overwash” and “collision regimes”, with the underlying assumption that all three dunes would be impacted by the same level of surge during a single storm event. Results from the GPR survey suggest that each site contains a bright, laterally continuous radar reflector that is interpreted with the aid of the sedimentary data as an erosional layer. Different characteristic radar facies and sequence boundaries provide evidence as to how each dune evolved through and after the storm. Results from XRF scans and grain size analysis show a direct comparison between the GPR reflectors at the storm surface and spikes in calcium counts from XRF scans to distinct changes in grain size parameters at the same depth. It is argued that the location of each shell layer corresponds to a storm surface generated during a single storm, which means it is possible to interpret different recovery mechanisms. The presence of the storm layer across the backbeach and dunes provides evidence for the height and extent of the surge during the storm event. The data suggests that the small dune was overtopped by the surge, experiencing minimal erosion and recovery. The intermediate dune was completely eroded by the surge, but showed the greatest recovery of all the dune sites. The large dune was scoured at the base with marginal impact along its crest and shows minimal recovery after the storm. These results suggest that the evolution (i.e., transgression) of a barrier island varies considerably over short distances.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-25T23:29:05Z No. of bitstreams: 1 KarinnaSonalyaAiresDaCosta_DISSERT.pdf: 1480184 bytes, checksum: 7f381aa2ccf52dfc01e411463cec63e9 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-05T20:01:53Z (GMT) No. of bitstreams: 1 KarinnaSonalyaAiresDaCosta_DISSERT.pdf: 1480184 bytes, checksum: 7f381aa2ccf52dfc01e411463cec63e9 (MD5) / Made available in DSpace on 2016-08-05T20:01:53Z (GMT). No. of bitstreams: 1 KarinnaSonalyaAiresDaCosta_DISSERT.pdf: 1480184 bytes, checksum: 7f381aa2ccf52dfc01e411463cec63e9 (MD5) Previous issue date: 2016-03-17 / Objetivo: investigar os efeitos imediatos da plataforma vibrat?ria no desempenho neuromuscular do quadr?ceps femoral e na oscila??o postural de sujeitos submetidos ? reconstru??o do ligamento cruzado anterior (LCA).Materiais e m?todos: trata-se de um ensaio cl?nico, randomizado e cego. Quarenta e quatro volunt?rios do g?nero masculino (idade m?dia de 27,4?6,2 anos, IMC de 26,8? 3,8 Kg/m? e tempo de p?s operat?rio 17? 1,4 semanas) foram randomizados em 2 grupos: plataforma OFF (n=22, protocolo sobre a plataforma vibrat?ria desligada) e plataforma ON (n=22, protocolo sobre a plataforma vibrat?ria ligada, numa frequ?ncia de 50 Hz e amplitude de 4 mm). Todos os volunt?rios foram submetidos ? avalia??o do senso de posi??o articular do joelho (SPA), da avalia??o dinamom?trica do quadr?ceps femoral (isom?trica e conc?ntrica a 60?/s) e da atividade eletromiogr?fica dos m?sculos VL e VM, al?m da oscila??o do centro de press?o (baropodometria) em dois momentos distintos: antes e imediatamente ap?s o protocolo de interven??o. Os dados foram analisados por meio dosoftware SPSS 20.0, atribuindo-se n?vel de signific?ncia de 5%. A estat?stica descritiva ? apresentada pela m?dia (medida de tend?ncia central) e desvio padr?o (medida de dispers?o). Para verificar a homogeneidade dos grupos foi usada uma ANOVA one way, e para a compara??o intra e intergrupos, uma ANOVA mixed model. Resultados: foram observadas diferen?as entre as avalia??es pr? e p?s para as vari?veis velocidade latero lateral, pico de torque isom?trico e trabalho total, na compara??o intragrupos. Entretanto, n?o foi verificada diferen?a significativa na compara??o intergrupos ap?s a aplica??o do protocolo, sobre a plataforma vibrat?ria. Conclus?o: o uso da plataforma vibrat?ria n?o modifica de maneira imediata o desempenho do quadr?ceps femoral, a atividade eletromiogr?fica do VL e VM, bem como n?o interfere na oscila??o do centro de press?o de indiv?duos submetidos ? reconstru??o do LCA. / Objective: to investigate the immediate effect of the vibrating platform on the neuromuscular performance of the quadriceps femoris and on the postural oscillation of subjects submitted to Anterior Cruciate Ligament (ACL) reconstruction. Materials and methods: this study is a randomized and blind clinical trial. Forty-four male volunteers (average age of 27,4 ?6,2 IMC of 26,85? 3,8 Kg/m? and post surgery timeframe of 17? 1,4 weeks) were randomized into two groups: OFF platform (n=22, protocol of exercise over the vibrating platform off) and ON platform (n=22 protocol of exercise over the vibrating platform on, 50Hz frequency and 4mm of amplitude). All volunteers were submitted to assessment the isokinetic evaluation of the quadriceps femoris (isometric and isokinetic at 60?/s) and of the electromyography activity of the muscles Vasto Lateralis (VL) and Vasto Medialis (VM), besides the postural oscillation (baropodometry) in two distinct moments: before and immediately after the intervention protocol. The data was analyzed through the SPSS 20.0 software, with a 5% significance level. To verify the homogeneity of the groups it was used an ANOVA one way, and a ANOVA mixed model to compare the intra and inter groups. Results: it was observed differences between the pre and the post, to latero lateral velocity, isometric torque peak and total work in comparison with intragroup. However, it wasn?t verified any difference in comparing the intergroup in the preevaluation and in the post-evaluation protocol over the vibrating platform. Conclusion: the use of the vibrating platform doesn?t change as an immediate manner the isokinetic performance of the quadriceps femoris, the electromyography activity of the VL and the VM, also doesn?t interfere with the postural oscillation of individuals that were submitted to the ACL reconstruction.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2018-03-12T19:37:13Z No. of bitstreams: 1 LidianeCristinaCorreiaBulhoes_DISSERT.pdf: 1256553 bytes, checksum: 8a1403a25ff7025a622f889416a372ea (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-03-16T15:25:26Z (GMT) No. of bitstreams: 1 LidianeCristinaCorreiaBulhoes_DISSERT.pdf: 1256553 bytes, checksum: 8a1403a25ff7025a622f889416a372ea (MD5) / Made available in DSpace on 2018-03-16T15:25:26Z (GMT). No. of bitstreams: 1 LidianeCristinaCorreiaBulhoes_DISSERT.pdf: 1256553 bytes, checksum: 8a1403a25ff7025a622f889416a372ea (MD5) Previous issue date: 2017-12-15 / Introdu??o: Os idosos tendem a apresentar redu??o no trofismo, na amplitude de ativa??o muscular e na for?a, o que pode impactar negativamente na sua funcionalidade. Estudos t?m sido realizados com exerc?cios na plataforma vibrat?ria, por?m, existe uma escassez na literatura no que se refere aos poss?veis efeitos neurofisiol?gicos agudos desta t?cnica em sujeitos idosos. Objetivo: Analisar os efeitos agudos de uma sess?o de exerc?cio na plataforma vibrat?ria sobre o desempenho neuromuscular dos membros inferiores em idosos. M?todos: Trata-se de um ensaio controlado, randomizado e cego, no qual 44 volunt?rios, de ambos os sexos, com idade m?dia de 68,5 ? 2,67 anos, foram submetidos a uma avalia??o da oscila??o postural (baropodometria), do desempenho isocin?tico e da atividade eletromiogr?fica dos m?sculos vasto lateral (VL) e s?leo, do membro dominante. Em seguida, foram distribu?dos aleatoriamente em dois grupos, com 22 participantes cada: grupo placebo (GP) ? executou um protocolo de exerc?cio com a plataforma desligada; e grupo experimental (GE) ? realizou um protocolo de exerc?cio com a plataforma ligada, numa frequ?ncia de 40 Hz e amplitude pico a pico de 4 mm. Ambos os grupos realizaram o mesmo protocolo de exerc?cios na plataforma, composto por 4 s?ries de 90 segundos de dura??o e intervalo de repouso de 1 minuto, em semi-agachamento bipodal est?tico, a 400 de flex?o de joelho. Ao final das interven??es os volunt?rios foram submetidos a uma reavalia??o id?ntica a realizada antes do protocolo de exerc?cios. Os dados foram analisados no software SPSS 21.0, atribuindo-se n?vel de signific?ncia de 5% (p ? 0,05). Para an?lise da normalidade dos dados foi usado o teste de Kolmogorov-Smirnov e para atestar a homogeneidade entre os grupos foi utilizado um teste ?t? para medidas independentes. Para compara??o intra e intergrupo foi utilizada uma ANOVA modelo misto. Resultados: Houve diferen?a significativa intergrupo no valor do RMS para o VL e intragrupo no RMS do s?leo, ap?s o protocolo de interven??o no GE. Na avalia??o do desempenho isocin?tico, o pico de torque dos extensores do joelho apresentou aumento intragrupo no GE e nos flexores plantares foi observado aumento intragrupo para o GP e GE; para a vari?vel pot?ncia houve aumento intragrupo, em ambos os grupos. N?o foi observada diferen?a significativa na oscila??o postural. Conclus?o: O protocolo de exerc?cio na plataforma vibrat?ria promove um maior recrutamento neuromuscular do vasto lateral em indiv?duos idosos. Entretanto, de maneira imediata, n?o foram observadas altera??es na oscila??o postural, nem no desempenho isocin?tico desses sujeitos. / Background: Elderly people tend to present a decrease of the trophism, amplitude of muscular activation and strength, which causes significant negative implications in their functionality. Studies about exercise on the whole body vibration have been performed, however, there is a lack in the literature regarding the possible neurophysiological acute effects of this technique in elderly people. Objective: To analyze the immediate effects of an exercise session on the vibratory platform on the lower limb neuromuscular performance of elderly. Methods: This is a ramdomized, blind, controlled trial, in wich 44 volunteers, of both genders, mean age of 68,5 ? 2,67 years, were submitted to an evaluation of the postural oscillation (baropodometry), isocinetic performance and electromyographic activity of the vastus lateralis (VL) and soleus muscle of the dominant limb. After, they were randomly assigned in two groups, with 22 participants each: placebo group (PG) ? underwent a series of exercises with the vibrating platform off; and experimental group (EG) - underwent a series of exercises with the vibrating platform on, configured at frequency of 40 Hz and a displacement amplitude of 4 mm. Both groups executed the same exercise protocol in the platform, composed of a bipodal isometric squat at 400 of knee flexion, being 4 series of 90 seconds of duration, with interval of 1 minute. At the end of the intervention, the volunteers were submitted to a re-evaluation identical to the previous performed before the exercise protocol. Data were analyzed using SPSS 21.0 software, assigning a level of significance of 5% (p ? 0,05). To the analysis of normality of data it was used the Kolmogorov-Smirnov test and to attest the homogeneity between groups, a paired-sample test t. To analyze the differences between and within group, it was used a mixed model ANOVA. Results: There was a significant between-group increase in RMS for the VL and within group for soleus RMS after the intervention protocol in the EG. For isokinetic performance, there was an within group increase in peak torque of knee extensors on EG and of plantar flexors on PG and EG; for the variable power, there was an within group increase in both groups. It was not observed significant differences on postural oscillation. Conclusion: The protocol of exercise on the whole-body vibration promotes a greater neuromuscular recruitment of VL muscles in elderly. However, it was not observed immediate effects on postural oscillation or in isokinetic performance in this population.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-20T22:31:59Z No. of bitstreams: 1 BrunoCesarRochaVitoria_DISSERT.pdf: 3884668 bytes, checksum: b274f830d7afc157319d7965ca5175fa (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-02-23T22:14:21Z (GMT) No. of bitstreams: 1 BrunoCesarRochaVitoria_DISSERT.pdf: 3884668 bytes, checksum: b274f830d7afc157319d7965ca5175fa (MD5) / Made available in DSpace on 2017-02-23T22:14:21Z (GMT). No. of bitstreams: 1 BrunoCesarRochaVitoria_DISSERT.pdf: 3884668 bytes, checksum: b274f830d7afc157319d7965ca5175fa (MD5) Previous issue date: 2016-09-23 / Ag?ncia Nacional do Petr?leo - ANP / Na ind?stria metal-mec?nica, um fator que gera muitos custos ? o desgaste de ferramentas de usinagem. Embora a literatura que aborda o assunto seja ampla, ainda n?o foi poss?vel consolid?-lo. Em muitos casos, n?o estim?-lo pode causar distor??es dimensionais e de acabamentos nas pe?as fabricadas, al?m de causar paradas no processo (para avaliar visualmente o qu?o desgastada est? a ferramenta) e, por conseguinte, preju?zos devidos a tempos improdutivos. Uma alternativa que possibilita assegurar boas condi??es da ferramenta de corte ? utilizar t?cnicas de monitoramento em tempo real, de forma indireta. O objetivo desse trabalho ? contribuir na verifica??o do sinal de vibra??o como indicador do estado de desgaste da ferramenta de corte com os par?metros de processo e materiais utilizados. Para isso utilizou-se uma fresa de 50 mm com dois insertos intercambi?veis de metal duro, montados diametralmente opostos. O corpo de prova foi de a?o AISI 4340. Realizou-se um corte concordante com profundidade lateral constante (ae) de 20 mm e avan?o por dente (fz) de 0,1 mm/dente. Para a realiza??o dos experimentos, foram consideradas uma condi??o de corte de desbaste e outra de acabamento. J? as ferramentas de corte foram consideradas como boa, com valor de desgaste de flaco m?dio (VBB) inferior a 0,35 mm e como gasta, com VBB superior a 0,35 mm. A vibra??o foi medida com um aceler?metro uniaxial e estes dados foram adquiridos e armazenados pelo LabView e processados com o Matlab. O sinal foi filtrado em algumas bandas e ent?o foi aplicado uma transformada r?pida de Fourier (FFT) para an?lise do espectro de frequ?ncia, al?m de serem extra?dos par?metros estat?sticos (RMS, Curtose, Pico e Fator de Crista) do sinal no dom?nio do tempo. Para o espectro de frequ?ncia, a banda que mostrou-se mais sens?vel ao desgaste foi a compreendida entre 30 Hz e 700 Hz. J? entre os par?metros estat?sticos, de alguma forma todos mostraram-se sens?veis ao desgaste. Sendo a RMS e a curtose as que foram sens?veis em mais casos e o sinal filtrado na banda de 1,6 kHz e 2,4 kHz foi o que teve uma maior amplitude de resultados positivos.

Made available in DSpace on 2015-04-14T13:53:45Z (GMT). No. of bitstreams: 1 438170.pdf: 1085888 bytes, checksum: 5a64b90d2fef499470471d638694ff45 (MD5) Previous issue date: 2012-03-20 / Introduction: With the ageing, changes in the balance are inherent in the physiological process, causing falls and complications associated with it. There are many strategies to improve balance, such as resistance physical exercise program, Tai Chi, and more recently whole body vibration. Objectives: to evaluate the efficacy of the whole body vibration over the balance and in life quality in healthy elderly women in the Geriatric clinic of S?o Lucas Hospital. Methods: sixteen weeks randomized clinical trial with 18 elderly women (9 in the interventional group and 9 in the control group) with age greater or equal 60 years, patients in Geriatric clinic of S?o Lucas Hospital. They do not have any severe or disabling diseases whose source is rheumatologic, orthopedic, neurovascular, renal or hepatic. The interventional group has trained in a whole body vibration with frequency between 10-15 Hz and the control has a sedentary life style. Exposure to whole body vibration was intermittent (3 minutes, 1 minute rest) for 11 minutes, three times per week during sixteen weeks. The instruments used were the social and health questionnaire, Berg Balance Scale, World Health Organization Quality of Life (WHOQOL) in the abbreviated version and Lawton?s Instrumental Activities of Daily Living Scale. Subjects were evaluated in the beginning, eight weeks and sixteen weeks after. For the analysis, frequencies, means, standard deviations, chisquare test, Student paired samples t-test, correlation coefficient of Pearson and McNemar test have been applied. The dataset was developed in Excel? 2007 and the data and statistical analysis was performed using SPSS 17. Results: in this study, no statistically significant difference between the interventional and control groups in the balance and life quality (p=0.81) has been achieved. However, a moderate correlation between the balance and the performance in the physical dominium in WHOQOL in the three evaluation moments (rt0=0.47, rt1=0.55 e rt2=0.56) has been shown. Conclusions: in this study, no improvement has been seen in the life quality and balance in the sample evaluated. However, it is important to mention that this limitation can be associated with the sampling size. / Introdu??o: Com o envelhecimento, altera??es do equil?brio s?o inerentes ao processo fisiol?gico, podendo acarretar quedas e complica??es ligadas ao evento. Existem v?rias estrat?gias para melhorar o equil?brio, como programas de exerc?cios f?sicos resistidos, Tai Chi e mais recentemente a plataforma vibrat?ria. Objetivos: avaliar a efic?cia da plataforma vibrat?ria no equil?brio e qualidade de vida de idosas saud?veis do ambulat?rio do Servi?o de Geriatria do Hospital S?o Lucas. M?todos: ensaio cl?nico randomizado de dezesseis semanas de dura??o, com 18 idosas (9 no grupo caso e 9 no grupo controle) de idade igual ou superiora 60 anos, usu?rias do Ambulat?rio de Geriatria Geral e que n?o possu?am doen?as graves ou incapacitantes de origem reumatol?gica, ortop?dica, neurovascular, renal ou hep?tica. O grupo interven??o realizou treino na plataforma vibrat?ria com uma freq??ncia entre 10-15Hz e o controle permaneceu com o estilo de vida sedent?rio. A interven??o na plataforma vibrat?ria foi intermitente (3 minutos, 1 minuto de repouso) por 11 minutos, tr?s vezes na semana durante dezesseis semanas. Os instrumentos utilizados foram o question?rio com dados sociais e de sa?de, Escala de Equil?brio de Berg, Avalia??o da Qualidade de Vida (WHOQOL) vers?o abreviada, Escala de Atividades Instrumentais de Vida Di?ria de Lawton. As pacientes foram avaliadas no in?cio do estudo, oito semanas e dezesseis semanas ap?s. Foram utilizadas freq??ncias, m?dias, desvios-padr?o, teste do qui-quadrado, teste t de Student para amostra pareada, coeficiente de correla??o de Pearson e teste de McNemar. O banco de dados foi desenvolvido em Excel vers?o 2007 e analisado no programa estat?stico SPSS 17. Resultados: no presente estudo, n?o se verificou diferen?a estatisticamente significativa entre o grupo caso e controle na melhora do equil?brio e da qualidade de vida (p=0.81). Demonstrou-se, no entanto, uma correla??o direta moderada entre o equil?brio e o desempenho no dom?nio f?sico do WHOQOL nos tr?s momentos de avalia??o (rt0=0.47,rt1=0.55 e rt2=0.56). Conclus?o: N?o foi observada uma melhora no equil?brio e na qualidade de vida na amostra estudada. No entanto, ? importante ressaltar que esta limita??o possa ter uma rela??o com o tamanho amostral.

Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2017-04-27T18:08:23Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) vanessa_goncalves_cesar_ribeiro.pdf: 3322252 bytes, checksum: a93b547b99b52d508c5eb5111bb065f0 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2017-05-16T19:39:36Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) vanessa_goncalves_cesar_ribeiro.pdf: 3322252 bytes, checksum: a93b547b99b52d508c5eb5111bb065f0 (MD5) / Made available in DSpace on 2017-05-16T19:39:36Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) vanessa_goncalves_cesar_ribeiro.pdf: 3322252 bytes, checksum: a93b547b99b52d508c5eb5111bb065f0 (MD5) Previous issue date: 2016 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG) / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / A fibromialgia (FM) est? associada a altera??es na resposta inflamat?ria e estudos demonstram aumento da concentra??o de biomarcadores pr? inflamat?rios em pacientes com a doen?a. Estes biomarcadores podem induzir v?rios sintomas, tais como fadiga, falta de sono, dor e mialgia. A vibra??o de corpo inteiro (VCI) pode ser uma estrat?gia terap?utica para o tratamento dessa doen?a por ser um est?mulo de curta dura??o e baixa intensidade. Os objetivos do presente estudo foram: 1) Caracterizar a intensidade do est?mulo de vibra??o de corpo inteiro em mulheres diagnosticadas com FM comparadas com o grupo de mulheres saud?veis (CT) pareados por idade e caracter?sticas antropom?tricas; e 2) Investigar o efeito de uma ?nica sess?o de VCI na resposta inflamat?ria destes grupos. As concentra??es plasm?ticas de leptina, adiponectina, resistina, receptores sol?veis do fator de necrose tumoral (sTNFR1 e sTNFR2) e BDNF foram mensuradas pelo m?todo ELISA e IL-8 por t?cnica cytrometric bead arrays (CBA) ambas conforme instru??es do fabricante. O consumo de oxig?nio (VO2) e a frequ?ncia card?aca (FC) foram registrados em repouso e durante todo o protocolo experimental. A percep??o subjetiva de esfor?o (PSE) foi registrada por meio da Escala de percep??o subjetiva de esfor?o de Borg. A sess?o aguda de VCI promoveu aumento do VO2 e FC de forma semelhante em ambos os grupos e esse est?mulo foi caracterizado como de intensidade leve. No entanto, houve intera??o (doen?a vs vibra??o) na PSE (P = 0,0078) demostrando que indiv?duos com FM apresentam maior PSE comparadas com mulheres saud?veis em repouso; al?m disso, o est?mulo de VCI promoveu aumento dessa percep??o no grupo FM, mantendo-se inalterado no grupo CT. Em repouso, os indiv?duos com FM apresentaram maiores concentra??es plasm?ticas de IL-8, de adiponectina e do receptor sol?vel de TNF, sTNFR1, e menores concentra??es plasm?ticas do receptor sol?vel sTNFR2 comparados com o grupo controle. N?o houve diferen?a entre os grupos quanto ?s concentra??es plasm?ticas de leptina, resistina e BDNF no estado basal. O est?mulo de VCI promoveu diminui??o das concentra??es plasm?ticas de adiponectina, sTNFR1e aumento das concentra??es de sTNFR2 no grupo FM. No grupo controle, o est?mulo de vibra??o promoveu aumento das concentra??es plasm?ticas de leptina, resistina e de sTNFR1. Houve intera??o (doen?a vs vibra??o) nas concentra??es plasm?ticas de adiponectina (P = 0,0001), sTNFR1 (P= 0,000001), sTNFR2 (P =0,0052), leptina (P = 0,0007), resistina (P = 0,0166) e BDNF (P = 0,0179). Os achados deste estudo s?o relevantes em termos cl?nicos uma vez que evidenciam que este est?mulo, considerado de baixa intensidade, parece ser suficiente para causar intera??o (doen?a versus est?mulo) e, consequentemente, modula??o de marcadores inflamat?rios, no sentido de ajuste da homeostase da inflama??o. O mecanismo neuroend?crino parece ser uma modula??o induzida pelo exerc?cio no sentido de maior adapta??o ? resposta inflamat?ria e de estresse destes pacientes. / Disserta??o (Mestrado) ? Programa Multic?ntrico de P?s-gradua??o em Ci?ncias Fisiol?gicas, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2016. / Fibromyalgia (FM) is associated with neuroendocrine and inflammatory feedback dysregulation. Whole body vibration (WBV) provides an acute stimulus that could be of therapeutic value for these patients. The aims of this study were 1) to characterize the intensity of the vibration stimulation in women diagnosed with FM compared to a control group of healthy women (HW) matched by age and anthropometric parameters and 2) to investigate the effect of a single session of WBV on inflammatory responses. Levels of adipokines, soluble tumor necrosis factor receptors (sTNFr)1, sTNFr2, and brain-derived neurotrophic factor (BDNF) were determined by enzyme-linked immunosorbent assay. Oxygen consumption (VO2) was estimated by a portable gas analysis system measured breath by breath, heart rate (HR) was measured using a HR monitor, and perceived exertion (RPE) was evaluated using the Borg scale of perceived exertion. Acutely mild WBV increased VO2 and HR similarly in both groups. There was an interaction (disease vs. vibration) in RPE (P = 0.0078), showing a higher RPE in FM compared to HW at rest, which further increased in FM after acute WBV, whereas it remained unchanged in HW. In addition, there was an interaction (disease vs. vibration) in plasma levels of adiponectin (P = 0.0001), sTNFR1 (P = 0.000001), sTNFR2 (P = 0.0052), leptin (P = 0.0007), resistin (P = 0.0166), and BDNF (P = 0.0179). In conclusion, a single acute session of mild and short WBV can improve the inflammatory status in patients with FM, reaching values close to those of matched HW at their basal status. The neuroendocrine mechanism seems to be an exercise-induced modulation towards greater adaptation to stress response in these patients.

?rea de concentra??o: Aspectos f?sico-funcionais e reabilita??o. / Na Capa da obra consta o t?tulo: "Vibra??o de corpo inteiro na posi??o est?tica com as m?os sobre a plataforma estimula o sistema neuromuscular potencializando a for?a muscular de preens?o manual". / Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2018-05-24T01:30:29Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) ana_lucia_cristino_souza.pdf: 1341281 bytes, checksum: 26bbfcfe249430241b08885a752b2dac (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2018-06-05T14:42:35Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) ana_lucia_cristino_souza.pdf: 1341281 bytes, checksum: 26bbfcfe249430241b08885a752b2dac (MD5) / Made available in DSpace on 2018-06-05T14:42:35Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) ana_lucia_cristino_souza.pdf: 1341281 bytes, checksum: 26bbfcfe249430241b08885a752b2dac (MD5) Previous issue date: 2017 / A vibra??o do corpo inteiro (VCI) pode ser uma modalidade ergog?nica capaz de melhorar o desempenho muscular. Uma vez que a transmissibilidade deste est?mulo ? reduzida quando aplicado sob os p?s, permanece uma lacuna no que tange a potencializa??o da for?a de preens?o manual (FPM) na posi??o est?tica, com as m?os sobre a plataforma, em indiv?duos saud?veis. O objetivo deste estudo foi investigar o efeito dose-resposta da exposi??o ? vibra??o na posi??o est?tica, com as m?os sobre a plataforma na FPM e nos registros eletromiogr?ficos (EMG) do m?sculo flexor superficial dos dedos. Vinte e oito mulheres saud?veis (idade: 27 + 8 anos, IMC: 23,2 + 4,5 kg.m-2) foram familiarizadas e submetidas de forma randomizada e aleatorizada a quatro situa??es experimentais: A). Sentado - m?os supinadas, apoiadas nas pernas, sem est?mulo vibrat?rio; B) Placebo ? m?os posicionadas sobre a plataforma desligada e est?mulo sonoro mimetizando o est?mulo de vibra??o; C). 25Hz / 2mm e D). 45Hz / 2mm - semelhante ? posi??o placebo com est?mulo vibrat?rio vertical sinusoidal em diferentes freq??ncias, com aplica??o da amplitude de 2mm. O per?odo de interven??o foi de 5 minutos em todas as situa??es experimentais. Antes e imediatamente ap?s as interven??es, o desempenho muscular da m?o dominante foi avaliado usando o dinam?metro de for?a manual (Jamar, EUA). Os registros EMG (Miotec, Brasil) ocorreram durante as situa??es experimentais. A raz?o neuronal representou a rela??o entre registros EMG e for?a de preens?o. A an?lise estat?stica foi realizada por ANOVA bifatorial, com post hoc (Tukey), sendo considerado p <0,05 significativo. Como resultado, a exposi??o ? vibra??o de 45Hz / 2mm resultou em um aumento de varia??o (p?s-antes) na FPM em m?dia de 84,6%, 93,7%, 62,6% para controle, placebo e 25Hz / 2mm, respectivamente. Este aumento foi acompanhado por uma menor rela??o neuronal. Os registros EMG durante o per?odo de interven??o demonstraram que apenas a exposi??o ao VCI (45Hz / 2mm) aumentou os registros EMG em uma m?dia de 94,8 % e 50,2% em rela??o ao controle e placebo, respectivamente. Esses achados mostram que a exposi??o ? vibra??o na posi??o push-up modificada est?tica potencializou a resposta miog?nica da m?o de forma dose dependente. O mecanismo parece estar relacionado com a estimula??o do sistema neuromuscular e a subsequente potencia??o p?s-ativa??o que defende o aprimoramento neural. / Disserta??o (Mestrado Profissional) ? Programa de P?s-Gradua??o em Reabilita??o e Desempenho Funcional, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2017. / Because the transmissibility of vibration is lower when applied under the feet, an uncertainty remains as to whether this stimulus could potentiate handgrip strength (HS) in the static modified push-up position. The aim of this study was to investigate the effect of vibration in the push-up position on HS and electromyography (EMG) of the superficial flexor muscle of the fingers. 28 healthy women (age: 27 + 8 years, BMI: 23.2 + 4.5 kg.m-2) were familiarized and submitted, to four experimental situations in a balanced, and randomized order: A). Seated supine with hands supported on the legs; B) Placebo ? hands on the platform off; C). 25 Hz/2 mm/49.30 m.s-2 and, D). 45 Hz/2 mm/159.73 m.s-2 similar to the placebo position with vibration turned on. The intervention was 5-minutes in all experimental situations. Muscle performance was evaluated using the HS dynamometer (Jamar, USA). The EMG (Miotec, Brazil) was registered throughout experimental situations. The neuronal ratio represented the ratio between EMG and HS. The 45 Hz exposure resulted in an increase in variation of the HS by 84.6%, 93.7%, 62.6% relative to the control, placebo and 25 Hz, respectively. This augment was accompanied by a lower neuronal ratio. The EMG during the intervention demonstrated that only 45 Hz increased the EMG by an average of 94.8%, and 50.2% compared to the control and placebo, respectively. In conclusion, the vibration in the push-up position potentiated the HS. The mechanism seems to be related to the stimulation of the neuromuscular system and subsequent post-activation potentiation advocating neural enhancement.

Made available in DSpace on 2014-12-17T15:01:25Z (GMT). No. of bitstreams: 1 JoselisseSCS_DISSERT_partes autorizadas.pdf: 100593 bytes, checksum: 6e0be4155f59bdd61810503b91014cbc (MD5) Previous issue date: 2010-11-10 / The objective of this study was to evaluate the displacement of petroleum/diesel solutions, at different concentrations, observing the effect of ultrasonic vibrations in fluids present in porous media to obtain an increase in oil production. The bubbles produced by ultrasound implode asymmetrically in the rock, generating liquid jets with high speed, displacing the oil present in porous media. The oil/diesel solutions were prepared with concentrations ranging from 20 g/L to 720 g/L in oil in relation to diesel and its viscosities were obtained in a Brookfield Rheometer RS2000, with temperature ranging from 25 to 55 ?C. After, calculations were performed to obtain the activation energy data for oil/diesel solutions. For oil recovery experiments, cylindrical samples of porous rock (core samples), with resin around the perimeter and its two circular bases free to allow the passage of fluids, were first saturated with 2% KCl solution and after with oil solutions. The results of oil extraction were satisfactory for all studied solutions, being obtained up to 68% partial displacement with saline solution injection. The ultrasound system was used after saline injection, increasing oil displacement, with oil extractions ranging from 63% to 79%. During the experiments, it was observed the warming of core samples, helping to reduce the viscosity of more concentrated systems, and consequently enhancing the percentage of advanced recovery for all studied solutions / O objetivo desse trabalho foi avaliar o deslocamento de solu??es de petr?leo/diesel, em diferentes concentra??es, observando o efeito das vibra??es ultrass?nicas no deslocamento dos fluidos presentes em meio poroso para obter um aumento na produ??o de petr?leo. As bolhas formadas pelo ultrassom implodem na rocha de forma assim?trica, gerando jatos de l?quido em alta velocidade, deslocando o ?leo do meio poroso. As solu??es foram preparadas em concentra??es variadas de 20 g/L a 720 g/L em ?leo com rela??o ao solvente diesel e suas viscosidades analisadas em um Re?metro Brookfield RS2000, com intervalos de temperaturas de 25 a 55 ?C. Em seguida, foram realizados c?lculos para obten??o dos dados de energia de ativa??o das solu??es ?leo/diesel. Para a realiza??o dos experimentos de recupera??o de petr?leo foram utilizadas amostras de rochas porosas cil?ndricas (plugs) resinadas na lateral deixando as extremidades livres para a transposi??o dos fluidos at? a satura??o, inicialmente com solu??o de KCl (2%) e posteriormente com as solu??es de petr?leo. Foram obtidos resultados satisfat?rios da extra??o para todas as solu??es estudadas, obtendo-se um deslocamento parcial por meio de inje??o salina de at? 68%. Ap?s este estudo foi utilizado o sistema de ultrassom, que ajudou ainda mais no deslocamento final, obtendo-se extra??es que variaram entre 63% e 79% de petr?leo. Durante os experimentos ocorreu um aquecimento nos plugs, que auxiliou na diminui??o da viscosidade dos sistemas mais concentrados, e consequentemente aumentou os percentuais de recupera??o avan?ada para todas as solu??es estudadas

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-18T20:27:50Z No. of bitstreams: 1 JosianeMariaDeMacedoFernandes_TESE.pdf: 1245335 bytes, checksum: 5135bc4fc7856839af432f3c4f427beb (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-23T22:17:47Z (GMT) No. of bitstreams: 1 JosianeMariaDeMacedoFernandes_TESE.pdf: 1245335 bytes, checksum: 5135bc4fc7856839af432f3c4f427beb (MD5) / Made available in DSpace on 2017-10-23T22:17:47Z (GMT). No. of bitstreams: 1 JosianeMariaDeMacedoFernandes_TESE.pdf: 1245335 bytes, checksum: 5135bc4fc7856839af432f3c4f427beb (MD5) Previous issue date: 2017-06-28 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Neste trabalho ? desenvolvida uma estrat?gia de controle n?o linear baseada no controle por modos deslizantes com compensa??o neural para estabiliza??o de sistemas subatuados sujeitos a vibra??es torcionais. No intuito de analisar o desempenho da abordagem proposta, a lei de controle foi implementada em uma coluna de perfura??o. As colunas de perfura??o s?o discretizadas em n partes. A atua??o ? dada no top drive, ou na mesa rotativa na extremidade superior da coluna, e todo o restante da coluna n?o recebe atua??o. As vibra??es torcionais abordadas neste trabalho s?o do tipo stick-slip, que ? o caso mais cr?tico desse tipo de vibra??o, cuja n?o linearidade ? geralmente causada pelo atrito entre a coluna e a forma??o, podendo ocorrer em qualquer ponto ao longo da coluna e deve ser levado em considera??o na modelagem. O controle por modos deslizantes apresenta robustez frente a incertezas param?tricas e perturba??es. A estrat?gia adotada n?o requer o conhecimento pr?vio de incertezas e n?o linearidades do sistema. No entanto, a fun??o descont?nua utilizada na lei de controle pode gerar o fen?meno de chattering, que em atuadores mec?nicos ? indesej?vel. Para atenuar o chattering, uma fun??o suave ? utilizada no lugar da descont?nua, sendo essa abordagem ocasionadora de diminui??o no desempenho do controlador. Nesse ponto, t?cnicas de intelig?ncia artificial podem contribuir na lei de controle para devolver o desempenho ou parte dele ao sistema. Duas arquiteturas de rede s?o empregadas para estimar a compensa??o, uma rede do tipo perceptron de m?ltiplas camadas e uma rede de fun??es de base radial. As superf?cies de controle s?o definidas como uma combina??o linear dos erros dos estados do sistema e uma rede neural ? adicionada para compensar a forma??o de ciclos limites, comumente apresentados ap?s a perda de efic?cia. Resultados s?o apresentados para demonstrar a performance do sistema de controle proposto. / In the present work, a nonlinear control strategy based on sliding mode method and artificial neural networks is presented. This approach can be applied to stabilize nonlinear under actuated systems subjected to torsional vibrations. In order to evaluate the proposed approach, the control law was implemented in a drill string. Drill strings are addressed due to their nonlinear and underactuated dynamics. The drill strings are discretized in n parts. The control output is given at the top drive whereas the other string parts are not directly actuated. Torsional vibrations employed in this work are stick-slip, which is the more critic way of torsional vibrations. Stick-slip is a nonlinearity usually caused by friction between the drill string and rock formations and can occurs at any point along its length. Sliding mode control is a very robust technique even with parametric uncertainties and external perturbations. There is no need of previous knowledge of uncertainties and nonlinearities. The discontinuous function adopted at the control law can lead to the undesired chattering effect. The discontinuous function can be replaced by a smooth function to avoid chattering, but this also implies on decrement of the system performance. In order to attenuate this effect, a compensation is added to the control law. Two different artificial neural network architectures are investigated: multilayer perceptrons and radial basis functions. The sliding surfaces are defined as a linear combination of tracking errors. The neural network is employed to mitigate the generated limit cycle. Numerical results are presented in order to demonstrate the performance of the control system.

Submitted by Sara Ribeiro (sara.ribeiro@ucb.br) on 2017-04-06T11:49:41Z No. of bitstreams: 1 RogerioWagnerdaSilvaTese2016.pdf: 2085584 bytes, checksum: 26857f1b5fc2d61521d37f92336f20dd (MD5) / Made available in DSpace on 2017-04-06T11:49:41Z (GMT). No. of bitstreams: 1 RogerioWagnerdaSilvaTese2016.pdf: 2085584 bytes, checksum: 26857f1b5fc2d61521d37f92336f20dd (MD5) Previous issue date: 2016-12-01 / For some time it has become common to use the whole body vibration training (IVC) for its benefits in a short period of time per session. This study evaluated the changes introduced in the body composition, bone mineral density, in hematological variables and the interleukins IL2, IL4, IL6, IL10, IFN-?? and TNF-??; resulting from training sessions and detraining after physical exercise in vibrating platform and a stationary bike. The final sample of 26 young sedentary women after divided into two groups: Vibration Group (GV) age 20.77 ?? 2.86 years and body mass index (BMI) 22.72 ?? 3.67 and Ergometry Group (GE) aged 20.62 ?? 4.35 years and body mass index (BMI) 21.31 ?? 4.18, both performed two distinct training programs, with 06 weeks of exercises and 06 weeks of detraining. Assessment and reassessment was carried out in three stages (T1, T2 and T3) predetermined to evaluate the changes in parameters that could be the result of conducted training. After compilation and analysis of data, significant changes in body composition were observed in bone mineral density, even in white blood count series. Significant response (p <0.050) in the collection times were identified in both groups for the variables: Hemoglobin and MCH; also we observed strong tendency to MCHC. Were also detected changes to IL2 was identified significant alteration being T1 and T2 (P <0.011) and between T1- T3 (P <0.003). While IFN-?? the major change came only between T1 and T2 (P <0.003). The results for IL-4, IL-6, IL-10 and TNF-?? has been found that these cytokines have different responses according to the type of physical activity undertaken between groups (GV x EG) and also over time (T1, T2 and T3). These results lead us to conclude that there is physiological adaptation to training and detraining independent of the type of exercise performed. / H?? algum tempo tem se tornado comum ?? utiliza????o do treinamento de vibra????o de corpo inteiro (VCI) por seus benef??cios em um curto per??odo de tempo por sess??o. Este estudo avaliou as altera????es promovidas na composi????o corporal, na densidade mineral ??ssea, nas vari??veis hematol??gicas e nas interleucinas IL2, IL4, IL6, IL10, IFN-?? e T NF-??; resultantes de sess??es de treinamento e do destreinamento ap??s o exerc??cio f??sico realizado em plataforma vibrat??ria e bicicleta ergom??trica. A amostra final foi de 26 mulheres jovens e sedent??rias que depois de divididas em dois grupos: Grupo Vibra????o (GV) idade 20,77 ?? 2,86 anos e ??ndice de Massa Corporal (IMC) 22,72 ?? 3,67 e Grupo Ergometria (GE) idade 20,62 ?? 4,35 anos e ??ndice de Massa Corporal (IMC) 21,31 ?? 4,18, ambos realizaram dois programas distintos de treinamento, com 06 semanas de exerc??cios e 06 semanas de destreinamento. Foi realizada a avalia????o e as reavalia????es em tr??s momentos (T1,T2 e T3) pr??-determinados para avaliar as altera????es nos par??metros que pudessem ser resultantes do treinamento realizado. Ap??s a compila????o e analise dos dados, n??o foram observadas altera????es significativas na composi????o corporal, na densidade mineral ??ssea, nem mesmo na s??rie branca do hemograma. Respostas significantes (p < 0.05) nos tempos de coleta foram identificadas em ambos os grupos para as vari??veis: Hemoglobina e HCM; observamos forte tend??ncia para CHCM. Tamb??m foram detectadas altera????es para IL2 foi identificada altera????o significante ente T1 e T2 (P<0,011) e entre T1-T3 (P<0,003). Enquanto para IFN-?? a altera????o importante apareceu somente entre T1 e T2 (P<0,003). Os resultados para IL-4, IL-6, IL-10 e TNF-?? mostraram que, estas citocinas inflamat??rias, apresentam respostas diferentes de acordo com o tipo de atividade f??sica realizada entre os Grupos (GV x GE) e tamb??m ao longo dos tempos (T1, T2 e T3). Estes resultados nos levam a concluir que existe adapta????o fisiol??gica ao treinamento e ao destreinamento independente do tipo de exerc??cio f??sico realizado.