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‣ Improvement of a testing apparatus for dynamometry: procedures for penetrometry and influence of strain rate to quantify the tensile strength of soil aggregates; Melhoramento de uma máquina de ensaio para dinamometria: procedimentos para penetrometria e influência da taxa de deformação na quantificação da resistência tênsil de agregados de solo

FIGUEIREDO, Getulio Coutinho; SILVA, Alvaro Pires da; TORMENA, Cássio Antonio; GIAROLA, Neyde Fabíola Balarezo; MORAES, Sergio Oliveira; ALMEIDA, Brivaldo Gomes de
Fonte: Sociedade Brasileira de Ciência do Solo Publicador: Sociedade Brasileira de Ciência do Solo
Tipo: Artigo de Revista Científica
Português
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Soil penetration resistance (PR) and the tensile strength of aggregates (TS) are commonly used to characterize the physical and structural conditions of agricultural soils. This study aimed to assess the functionality of a dynamometry apparatus by linear speed and position control automation of its mobile base to measure PR and TS. The proposed equipment was used for PR measurement in undisturbed samples of a clayey Nitossolo Vermelho eutroférrico (Kandiudalfic Eutrudox) under rubber trees sampled in two positions (within and between rows). These samples were also used to measure the volumetric soil water content and bulk density, and determine the soil resistance to penetration curve (SRPC). The TS was measured in a sandy loam Latossolo Vermelho distrófico (LVd) - Typic Haplustox - and in a very clayey Nitossolo Vermelho distroférrico (NVdf) - Typic Paleudalf - under different uses: LVd under annual crops and native forest, NVdf under annual crops and eucalyptus plantation (> 30 years old). To measure TS, different strain rates were applied using two dynamometry testing devices: a reference machine (0.03 mm s-1), which has been widely used in other studies, and the proposed equipment (1.55 mm s-1). The determination coefficient values of the SRPC were high (R² > 0.9)...

‣ Relação entre a dinamometria isocinética e a incidência de lesões musculoesqueléticas em atletas de futebol de salão na fase pré temporada; Relation between isokinetic dynamometry and the incidence of musculoskeletal injuries during pre-season period in indoor soccer players

Andrade, Nataly Vasconcellos Santos de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 05/11/2008 Português
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INTRODUÇÃO: O aumento da prática do futebol de salão como lazer ou desempenho trouxe mais lesões do sistema musculoesquelético, que passaram a exigir maior atenção e cuidados dos profissionais de saúde. OBJETIVO: Avaliar os parâmetros da dinamometria isocinética dos músculos flexores e extensores do joelho na fase pré temporada, verificar a incidência de lesões musculoesqueléticas de membros inferiores nos jogadores de futebol de salão e fazer a relação entre as lesões e a função muscular. MÉTODOS: Foram avaliados 92 jogadores de futebol de salão. A avaliação isocinética foi feita por meio do dinamômetro isocinético Cybex, modelo Norm nas velocidades angulares de 60o /segundos e 180o/segundos. Durante a temporada de jogos foi realizada a coleta das lesões. Foram analisados o pico de torque, o trabalho total e a relação flexora/extensora corrigidos pela massa corporal e expressos em porcentagem. Os dados foram submetidos a análises descritivas (média, desvio padrão e porcentagem) e foram utilizados os testes de Wilcoxon e Kruskal-Wallis para comparações das variáveis quantitativas e qualitativas (P<0,05). RESULTADOS: Diferenças significantes foram encontradas na pré temporada para o pico de torque flexor...

‣ Efeito da maturação biológica sobre o consumo máximo de oxigênio, limiares ventilatórios e torque muscular em jogadores de futebol

Cunha, Giovani dos Santos
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Tese de Doutorado Formato: application/pdf
Português
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A maturação biológica tem demonstrado efeito positivo sobre os valores absolutos de consumo máximo de oxigênio (VO2max), limiares ventilatórios (LV1 e LV2) e torque muscular (TM) durante o crescimento, mas não está totalmente elucidado se este efeito é resultado apenas do aumento do tamanho corporal, da metodologia de normalização ou da melhora de fatores qualitativos do sistema cardiorrespiratório e muscular. Assim, conduzimos dois estudos com o objetivo de verificar o efeito da maturação biológica sobre: (1°) VO2max, LV2 e LV1; (2º) TM e arquitetura muscular. No primeiro estudo, 79 jogadores de futebol classificados em três grupos de acordo com seu estágio maturacional, pré-púberes (PREP, n=14), púberes (PUB, n=38) e pós-púberes (POSP, n=27) realizaram um teste progressivo máximo em esteira para determinarmos o VO2max, LV2 e LV1. Os resultados demonstraram que o volume muscular estimado total (VMT) foi considerado a melhor variável de normalização e evidenciou que os valores de VO2max ml.ml-0,43.min-1 foram significativamente maiores nos grupos POSP (112,9±9,9) e PUB (107,4±9,5) em relação ao grupo PREP (100,0±7,8), com a maturação biológica apresentando efeito positivo de 18%. O LV2 (ml.ml-0,48.min-1) apresentou diferença significativa apenas entre os grupos POSP (57...

‣ Improvement of a testing apparatus for dynamometry: procedures for penetrometry and influence of strain rate to quantify the tensile strength of soil aggregates

Figueiredo,Getulio Coutinho; Silva,Alvaro Pires da; Tormena,Cássio Antonio; Giarola,Neyde Fabíola Balarezo; Moraes,Sergio Oliveira; Almeida,Brivaldo Gomes de
Fonte: Sociedade Brasileira de Ciência do Solo Publicador: Sociedade Brasileira de Ciência do Solo
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2011 Português
Relevância na Pesquisa
27.353042%
Soil penetration resistance (PR) and the tensile strength of aggregates (TS) are commonly used to characterize the physical and structural conditions of agricultural soils. This study aimed to assess the functionality of a dynamometry apparatus by linear speed and position control automation of its mobile base to measure PR and TS. The proposed equipment was used for PR measurement in undisturbed samples of a clayey "Nitossolo Vermelho eutroférrico" (Kandiudalfic Eutrudox) under rubber trees sampled in two positions (within and between rows). These samples were also used to measure the volumetric soil water content and bulk density, and determine the soil resistance to penetration curve (SRPC). The TS was measured in a sandy loam "Latossolo Vermelho distrófico" (LVd) - Typic Haplustox - and in a very clayey "Nitossolo Vermelho distroférrico" (NVdf) - Typic Paleudalf - under different uses: LVd under "annual crops" and "native forest", NVdf under "annual crops" and "eucalyptus plantation" (> 30 years old). To measure TS, different strain rates were applied using two dynamometry testing devices: a reference machine (0.03 mm s-1), which has been widely used in other studies, and the proposed equipment (1.55 mm s-1). The determination coefficient values of the SRPC were high (R² > 0.9)...

‣ Study of muscle fatigue in isokinetic exercise with estimated conduction velocity and traditional electromyographic indicators

Schwartz,Fabiano Peruzzo; Bottaro,Martim; Celes,Rodrigo Souza; Pereira,Maria Claudia; Rocha Júnior,Valdinar de Araújo; Nascimento,Francisco Assis de Oliveira
Fonte: SBEB - Sociedade Brasileira de Engenharia Biomédica Publicador: SBEB - Sociedade Brasileira de Engenharia Biomédica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2014 Português
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INTRODUCTION: In the study of human biomechanics, it is often desirable to evaluate fatigue in the muscles that are involved in performing a particular task. Identifying the phenomena responsible for this condition is a problem that in most cases is complex and requires appropriate research mechanisms. Isokinetic dynamometry (ID) and surface electromyography (SEMG) are two techniques widely used in studies on strength and muscle fatigue. Their effectiveness is conditioned upon a good understanding of their limitations and the adoption of procedures to fully exploit the potential of each one. The main goal of the present study is to verify whether the electromyographic parameters, especially the conduction velocity (CV), are sensitive to the fatigue instauration process within sets of maximal isokinetic contractions. CV is a basic physiological parameter directly related to muscle activity and still little explored in experiments combining ID and SEMG. METHODS: Instrumentation architecture that combines ID and SEMG was used to estimate electromyographic and biomechanical parameters in protocols of maximum intensity isokinetic knee extension exercises. This architecture allows for limiting the parameter estimates to a specific region of isokinetic exercise...

‣ Isokinetic dynamometry in elderly women undergoing total knee arthroplasty: a comparative study

Aquino,Marcos de Amorim; Leme,Luiz Eugênio Garcez
Fonte: Faculdade de Medicina / USP Publicador: Faculdade de Medicina / USP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2006 Português
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OBJECTIVE: The present study assessed the reliability and validity of isokinetic dynamometry in the qualitative determination of the evolution of total knee arthroplasty. Cases: 20 patients whose mean age was 71.35 years, undergoing knee arthroplasty, and 25 controls whose mean age was 71.36 years. METHOD: Computerized isokinetic assessment of flexor and extensor muscles using a CYBEX® 6000 dynamometer. RESULTS: The total flexor/extensor effort ratio for the treated side of patients vs the nondominant side of controls was not significantly different. The flexion/extension ratio concerning maximum torque for the treated side of patients vs the nondominant side of controls was significantly different. CONCLUSION: By detecting deficiencies in the balance of flexor and extensor muscles (a balance that is required for uniform gait), it will be possible to select specific rehabilitation exercises according to the individual needs of each patient undergoing surgery.

‣ Accuracy, reproducibility, and variability of hand-held dynamometry in motor neuron disease.

Goonetilleke, A; Modarres-Sadeghi, H; Guiloff, R J
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /03/1994 Português
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A spring-loaded device that "breaks" at preset forces was used to assess readings obtained by hand-held dynamometry by three raters with varying experience in the method. Overall accuracy (3%), but not reproducibility or variability, was improved by greater experience. Readings obtained jointly by three raters had 53% greater variability than those obtained by a single rater. Nine muscle groups in 19 patients with motor neuron disease were assessed at 10 sessions (three replications per session) over six days by the experienced rater. Muscle force was expressed relative to that of 22 matched normal controls. The reproducibility was good with a mean % difference of 13.2 and repeatability coefficient of 2.17 kg-force for readings six days apart; the overall correlation coefficient was 0.98. The mean coefficient of variation (CV) of 10 readings was 9.9%. The poorer reproducibility and greater variability seen in clinically weaker muscles may account for differences in patients with bulbar palsy and classical amyotrophic lateral sclerosis; the degree of spasticity had no effect. The rater was estimated to contribute 37% of the total variability when testing patients. The use of a composite score by combining normalised dynamometry readings of eight limb muscles improved mean % difference to 6.7 and mean CV to 5.8%. The reproducibility and variability of hand-held dynamometry readings obtained by a single rater compare well with those of fixed devices. Readings from single raters...

‣ A Systematic Review of Dynamometry and its Role in Hand Trauma Assessment

P, Mafi; R, Mafi; S, Hindocha; M, Griffin; W, Khan
Fonte: Bentham Open Publicador: Bentham Open
Tipo: Artigo de Revista Científica
Publicado em 23/02/2012 Português
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The dynamometer was developed by American neurologists and came into general use in the late 19th century. It is still used in various ways as a diagnostic and prognostic tool in clinical settings. In this systematic review we assessed in detail the different uses of dynamometry, its reliability, different dynamometers used and the influence of rater experience by bringing together and evaluating all published literature in this field. It was found that dynamometry is applied in a wide range of medical conditions. Furthermore, the great majority of studies reported acceptable to high reliability of dynamometry. Jamar mechanical dynamometer was used most often in the studies reviewed. There were mixed results concerning the effect of rater experience. The factors influencing the results of dynamometry were identified as age, gender, body weight, grip strength, BMI, non/dominant hand, assessing upper/lower limbs, rater and patient’s strength and the distance from the joint where the dynamometer is placed. This review provides an understanding of the relevance and significance of dynamometry which should serve as a starting point to guide its use in hand trauma assessment. On the basis of our findings, we suggest that hand dynamometry has a great potential...

‣ Reliability of lumbar dynamometry measurements in patients with chronic low back pain with test-retest measurements on different days

Hutten, M. M. R.; Hermens, H. J.
Fonte: Springer-Verlag Publicador: Springer-Verlag
Tipo: Artigo de Revista Científica
Publicado em /01/1997 Português
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Lumbar dynamometry is a potentially useful method for assessing the state of trunk muscles in low back pain (LBP) patients. The purpose of this study was to assess the reliability of lumbar dynamometry measurements in chronic LBP patients by conducting test-retest measurements on different days. Thirtyone men and 14 women with chronic LBP participated in this study. The experiments consisted of three sets of lumbar dynamometry measurements (Isostation B200) carried out on three different days with a 2- to 3-day interval. A standard protocol was administered to all subjects, consisting of a range-of-motion measurement about each axis, a 5 s maximum isometric trial about each axis and five dynamic repetitions about each axis against a resistance set at 25% and at 50% of the maximum isometric torque. Correlation coefficients and regression analysis were used to detect possible learning effects. One-way anova and regression analysis were used to assess the reliability of the measurements. High coefficients were found for the correlation between the first and second lumbar dynamometry measurements. Regression analysis showed that the differences between those measurements were not significant. This means that there was no learning effect operating between the first and second lumbar dynamometry measurements. One-way anova showed a reliability higher than 0.90 for the torque and velocity parameters. Reliability for the range-of-motion parameters was somewhat lower: between 0.76 and 0.94. Regression analysis showed no significant differences between the second and third measurements for the torque and velocity parameters. For range-of-motion parameters significant differences were found. From this study it can be concluded that the Isostation B200 provides reliable measures of torque and velocity parameters...

‣ Relationships between isoinertial lumbar dynamometry parameters and demographic parameters in chronic low back pain patients

Hutten, M. M. R.; Hermens, H. J.
Fonte: Springer-Verlag Publicador: Springer-Verlag
Tipo: Artigo de Revista Científica
Publicado em /12/1998 Português
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The purpose of this study was to investigate which demographic parameters are most important in relation to lumbar dynamometry performance in patients with chronic low back pain (LBP). Forty-five chronic LBP patients participated in this study. Gender, age, weight and height were determined and a lumbar dynamometry measurement was carried out, using the Isostation B200. Student’s t-test, ANOVA techniques and correlation coefficients were used to investigate the relationships between each demographic parameter and lumbar dynamometry performance. Stepwise multiple linear regression analyses were performed afterwards to determine which demographic parameters are most important in relation to lumbar dynamometry performance. Results indicate significant relationships (1) between gender, height, weight and all lumbar dynamometry parameters and (2) between age and three of the six isometric torque parameters. No significant relationship was found between age and maximum velocity parameters. Results of the stepwise multiple linear regression analyses show that the demographic parameters explain 27–47% of the variance in maximum isometric strength parameters and 19–25% of the variance in maximum velocity parameters. Gender is the most important demographic parameter...

‣ Between-Rater Reliability of the 6-Minute Walk Test, Berg Balance Scale, and Handheld Dynamometry in People with Multiple Sclerosis

Toomey, Elaine; Coote, Susan
Fonte: The Consortium of Multiple Sclerosis Centers Publicador: The Consortium of Multiple Sclerosis Centers
Tipo: Artigo de Revista Científica
Publicado em //2013 Português
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This study investigated the between-rater reliability of the Berg Balance Scale (BBS), 6-Minute Walk test (6MW), and handheld dynamometry (HHD) in people with multiple sclerosis (MS). Previous studies that examined BBS and 6MW reliability in people with MS have not used more than two raters, or analyzed different mobility levels separately. The reliability of HHD has not been previously reported for people with MS. In this study, five physical therapists assessed eight people with MS using the BBS, 6MW, and HHD, resulting in 12 pairs of data. Data were analyzed using intraclass correlation coefficients (ICCs), Spearman correlation coefficients (SCCs), and Bland and Altman methods. The results suggest excellent agreement for the BBS (SCC = 0.95, mean difference between raters [d̄] = 2.08, standard error of measurement [SEM] = 1.77) and 6MW (ICC = 0.98, d̄ = 5.22 m, SEM = 24.76 m) when all mobility levels are analyzed together. Reliability is lower in less mobile people with MS (BBS SCC = 0.6, d̄ = −1.83; 6MW ICC = 0.95, d̄ = 20.04 m). Although the ICC and SCC results for HHD suggest good-to-excellent reliability (0.65–0.85), d̄ ranges up to 17.83 N, with SEM values as high as 40.95 N. While the small sample size is a limitation of this study...

‣ Plantarflexor force production in isometric and stretch-shortening cycle tasks

Furlong, Laura-Anne M; Harrison, Andrew J.
Fonte: International Society of Biomechanics Publicador: International Society of Biomechanics
Tipo: info:eu-repo/semantics/conferenceObject; all_ul_research; ul_published_reviewed
Português
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peer-reviewed; The ankle joint and its surrounding musculature are vital in sprinting, and recent work has developed a method to isolate the plantarflexor muscle group for analysis of its force-producing capabilities. The aim of this study was to compare values for plantarflexor force obtained using isometric dynamometry and an adapted force sledge in twenty healthy subjects. Results showed low relationships between isometric and dynamic strength measures, probably because the dynamic test utilises a stretch-shortening cycle. No relationship was observed between isometric strength and the sledge foot plate height during the task with a moderate relationship observed between dynamic strength and plate height. This highlights the important role the Achilles tendon plays in dynamic tasks.

‣ Valoración de los puntos gatillo miofasciales en el antebrazo y la mano de escaladores y su relación con variables antropométricas

Zapata Cáceres, Irene
Fonte: Universidade de Alcalá Publicador: Universidade de Alcalá
Tipo: Trabalho de Conclusão de Curso Formato: application/pdf
Português
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Introducción: La práctica de la escalada ha crecido progresivamente en popularidad. La escalada es fisiológicamente única porque requiere contracciones isométricas intermitentes y mantenidas de la musculatura del antebrazo. Los antebrazos, manos y dedos se solicitan con frecuencia y juegan un papel primordial. Objetivo: Determinar la incidencia de puntos gatillo miofasciales (PG) en los antebrazos y manos de escaladores a nivel recreativo y competitivo y la relación existente entre los PG y variables de la práctica deportiva. Materiales y métodos: Se trata de un estudio descriptivo transversal o de prevalencia con una muestra de 110 escaladores voluntarios seleccionados al azar, 85 hombres y 25 mujeres con una media de edad de 28,63 años. Los participantes debieron cumplimentar un cuestionario. Se registraron bilateralmente datos sobre los puntos gatillo miofasciales del antebrazo y la mano de los participantes. Se valoró el índice de masa corporal (IMC), el peso magro, la densidad corporal y el porcentaje de grasa corporal. Se incluyó también la valoración de las áreas mesobraquiales de los brazos y medidas dinamométricas de presión (fuerza del agarre). Resultados y discusión: Los PG estuvieron más presentes en los músculos de la mano y dedos. Los escaladores con nivel intermedio...

‣ Amiotrofia de extremidades inferiores en la enfermedad de Charcot-Marie-Tooth tipo 1A : estudio longitudinal clínico, neurofisiológico y de resonancia magnética

Pelayo Negro, Ana Lara
Fonte: Universidade de Cantabria Publicador: Universidade de Cantabria
Tipo: Tese de Doutorado
Português
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RESUMEN: Se llevó a cabo un estudio longitudinal de dos años de duración en 14 pacientes CMTIA y 14 controles emparejados por edad y sexo. En los pacientes realizamos un examen neurológico con dinamometría manual, electrofisiología y RM muscular de extremidades inferiores al inicio del estudio y dos años. En los controles se administró el mismo protocolo una única vez. Las edades de los pacientes oscilaban entre 12 y 51 años (31.6+-13.5). Las manifestaciones relevantes en la evaluación inicial incluyeron pies cavos, arreflexia, debilidad de extremidades inferiores e hipopalestesia. En cuanto al balance muscular, se observó una buena correlación entre la evaluación manual y la dinamometría. En comparación con los controles, los tests de Lunge, de los 10 metros y de los 9 agujeros estaban alterados. Las puntuaciones de la escala CMTNS y FDS indicaron que los pacientes exhibían un fenotipo leve y la mayoría presentaban una ligera dificultad para caminar. La electrofisiología reveló un enlentecimiento marcado y difuso de la conducción nerviosa y una reducción variable de la amplitud del potencial de acción muscular distalmente acentuada que se acompañaba de edema en los músculos de las piernas. Todos los hallazgos clínico-electrofisiológicos y de imagen permanecieron prácticamente inalterados durante el seguimiento. A través del análisis multivariante...

‣ Maximal Versus Non Maximal Muscular Exertions: A Study of Valid Measures Using Isokinetic Dynamometry

Almosnino, Sivan
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
Português
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Muscle strength capabilities are a determinant in the ability to successfully accomplish everyday tasks. As such, the quantification of this aspect of human performance is of interest in many settings. Currently, the validity of muscle strength test results is reliant on the notion that during testing, the participant exerted an effort that is sincere, and that consisted of maximal voluntary contractions. Therefore, the ability to differentiate between maximal and non maximal muscular exertions is of importance. The purpose of this dissertation was to develop and validate probability-based decision rules for differentiating between maximal and non-maximal voluntary exertions of the knee and shoulder joint musculature during isokinetic dynamometry-based testing. For development of the decision rules, healthy participants performed a series of maximal and non-maximal exertions at different testing velocities through a prescribed range of motion. Two different theory-based approaches were subsequently used for decision rule development: the first approach was based on expected better consistency in strength waveform shapes and relative magnitudes during performance of maximal efforts in comparison to non-maximal efforts. The second approach was based on the known force-velocity dependency in skeletal muscles. In terms of discriminatory performance...

‣ Relationship between function, strength and electromyography of upper extremities of persons with tetraplegia

de Vargas Ferreira, V. M.; Varoto, R.; Azevedo Cacho, E. W.; Cliquet, A., Jr.
Fonte: NATURE PUBLISHING GROUP; LONDON Publicador: NATURE PUBLISHING GROUP; LONDON
Tipo: Artigo de Revista Científica
Português
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Study design: Cross-sectional. Objective: To analyze the relationships between functional tests, arm strength and root mean square of surface electromyography (EMG). Setting: Sao Paulo, Brazil. Methods: Twenty-four individuals with chronic tetraplegia participated. Upper extremity motor score (UEMS), functional independence measure (FIM) motor score, spinal cord independence measure III and capabilities of upper extremity (CUE) were performed. Muscle strength of the right elbow flexors-extensors was assessed using dynamometry and manual muscle test (MMT) and EMG of right biceps and triceps brachii were performed. Spearman's rank correlation coefficients and Mann-Whitney's U-test were used. Results: Functional tests and UEMS correlated strongly among them. UEMS highly correlated with triceps dynamometry and EMG. The dynamometry showed a very high correlation with MMT on the extensor group and a moderate correlation with flexor group. Triceps EMG showed moderate correlation with FIM and CUE. High correlations between triceps EMG and elbow extensors dynamometry and MMT were observed. A significant better performance on functional tests was observed on lower ASIA motor levels. The low-tetraplegia group showed a significant higher score on triceps EMG and dynamometry. Conclusion: Arm strength and EMG seem to be related to functional capabilities and independence in chronic tetraplegia. Spinal Cord (2012) 50...

‣ Relationship between function, strength and electromyography of upper extremities of persons with tetraplegia

de Vargas Ferreira, V. M.; Varoto, R.; Azevedo Cacho, E. W.; Cliquet, A., Jr.
Fonte: Nature Publishing Group; London Publicador: Nature Publishing Group; London
Tipo: Artigo de Revista Científica
Português
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Study design: Cross-sectional. Objective: To analyze the relationships between functional tests, arm strength and root mean square of surface electromyography (EMG). Setting: Sao Paulo, Brazil. Methods: Twenty-four individuals with chronic tetraplegia participated. Upper extremity motor score (UEMS), functional independence measure (FIM) motor score, spinal cord independence measure III and capabilities of upper extremity (CUE) were performed. Muscle strength of the right elbow flexors-extensors was assessed using dynamometry and manual muscle test (MMT) and EMG of right biceps and triceps brachii were performed. Spearman's rank correlation coefficients and Mann-Whitney's U-test were used. Results: Functional tests and UEMS correlated strongly among them. UEMS highly correlated with triceps dynamometry and EMG. The dynamometry showed a very high correlation with MMT on the extensor group and a moderate correlation with flexor group. Triceps EMG showed moderate correlation with FIM and CUE. High correlations between triceps EMG and elbow extensors dynamometry and MMT were observed. A significant better performance on functional tests was observed on lower ASIA motor levels. The low-tetraplegia group showed a significant higher score on triceps EMG and dynamometry. Conclusion: Arm strength and EMG seem to be related to functional capabilities and independence in chronic tetraplegia. Spinal Cord (2012) 50...

‣ Dinamometría como examen predictor de desordenes musculoesqueléticos (DME) de miembros superiores en tabajadores del sector floricultor

Leyva Zúñiga, Miguel Ernesto; Pérez Villamor, Andrea; Rodríguez Muñoz, León
Fonte: Facultad de Medicina Publicador: Facultad de Medicina
Tipo: info:eu-repo/semantics/bachelorThesis; info:eu-repo/semantics/acceptedVersion Formato: application/pdf
Publicado em 11/01/2011 Português
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RESUMEN Objetivo: Analizar el comportamiento de la sintomatología de los Desórdenes Músculo-esqueléticos (DME) de miembros superiores y determinar si la dinamometría es predictiva y sirve como soporte para el diagnostico de los mismos. Pacientes y Métodos: Se tomó una cohorte de 400 trabajadores de tres empresas del sector floricultor de la sabana de Bogotá en el año 2006, quienes fueron evaluados clínicamente por un médico especialista en salud ocupacional. Se seleccionaron 105 trabajadores que no presentaban síntomas osteomusculares de miembros superiores, a quienes se realizó seguimiento clínico y dinamometría anual hasta el año 2009. En cada evaluación se realizaron tres mediciones con el dinamómetro Dynatron® midiendo la fuerza de agarre en cada mano, tomando como dato final el promedio obtenido. Los datos fueron digitados en un base de Excel 2003 (Office®) y la depuración y el procesamiento fueron realizados en el programa estadístico de sobrevida. Resultados: El grupo de estudio estaba compuesto por 73 mujeres (69.5%) y 32 hombres (32.5%). La mano dominante fue la derecha en 99 trabajadores (94.3%). El índice de masa corporal (IMC) se encontró alterado revelando sobrepeso en 50 trabajadores (47.6%). Tenían una media de antigüedad en la empresa de 6...

‣ Pretransitional effects in dimyristoylphosphatidylcholine vesicle membranes: optical dynamometry study.

Dimova, R; Pouligny, B; Dietrich, C
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /07/2000 Português
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We used micron-sized latex spheres to probe the phase state and the viscoelastic properties of dimyristoylphosphatidylcholine (DMPC) bilayers as a function of temperature. One or two particles were manipulated and stuck to a DMPC giant vesicle by means of an optical trap. Above the fluid-gel main transition temperature, T(m) congruent with 23.4 degrees C, the particles could move on the surface of the vesicle, spontaneously (Brownian motion) or driven by an external force, either gravity or the laser beam's radiation pressure. From the analysis of the particle motions, we deduced the values of the membrane hydrodynamic shear viscosity, eta(s), and found that it would increase considerably near T(m). Below T(m), the long-distance motion of the particles was blocked. We performed experiments with two particles stuck on the membrane. By optical dynamometry, we measured the elastic resistance of the membrane to a variation in the interparticle distance and found that it would decrease considerably (down to zero) when the temperature was increased to T(m). We propose an interpretation relating the elastic response to the membrane curvature modulus, k(C). In this scheme, the two-bead dynamometry experiments provide a direct measurement of k(C) in the P'(beta) phase of lipid bilayers.

‣ A laserterapia de baixa potência melhora o desempenho muscular mensurado por dinamometria isocinética em humanos; Low-level laser therapy enhances muscular performance as measured by isokinetic dynamometry in humans

Leal Junior, Ernesto Cesar Pinto; Nassar, Francis Régio; Tomazoni, Shaiane da Silva; Bjordal, Jan Magnus; Lopes-Martins, Rodrigo Álvaro Brandão
Fonte: Universidade de São Paulo. Faculdade de Medicina Publicador: Universidade de São Paulo. Faculdade de Medicina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; ; Formato: application/pdf
Publicado em 01/12/2010 Português
Relevância na Pesquisa
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A fadiga muscular é uma nova área de pesquisa em laserterapia, com poucos estudos conduzidos. Embora a laserterapia de baixa potência (LBP) previamente ao exercício tenha apresentado resultados positivos no retardo da fadiga musculoesquelética, ainda não foi estudada utilizando-se a dinamometria isocinética para mensurar desempenho e fadiga muscular. Este estudo tem o objetivo de avaliar os efeitos da LBP (655 nm, 50 mW, 2,4 J por ponto e 12 J de energia total) sobre o desempenho e fadiga muscular do músculo tibial anterior, utilizando dinamometria isocinética (30 repetições de contração concêntrica) em 14 indivíduos saudáveis sedentários do sexo masculino. Os voluntários foram avaliados ao efetuar 30 repetições isocinéticas de dorsiflexão de tornozelo à velocidade angular de 240°.seg-1. Os resultados mostram que, quando os voluntários foram tratados com LBP antes do exercício, os valores do pico de torque (30,91±5,86 N.m) foram significativamente superiores, comparados a três medições anteriores sem a aplicação de LBP (24,92±7,45 N.m, p; Skeletal muscle fatigue is a novel research area in laser therapy, there being few studies carried out. Though low-level laser therapy (LLLT) applied prior to exercise has showed positive results in delaying skeletal muscle fatigue...