Página 1 dos resultados de 414 itens digitais encontrados em 0.001 segundos

Motor readiness and joint torque production in lower limbs of older women fallers and non-fallers

Crozara, Luciano Fernandes; Morcelli, Mary Hellen; Marques, Nise Ribeiro; Hallal, Camilla Zamfolini; Spinoso, Deborah Hebling; de Almeida Neto, Antônio Francisco; Cardozo, Adalgiso Coscrato; Gonçalves, Mauro
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 1131-1138
ENG
Relevância na Pesquisa
27.38%
This study aimed to evaluate the motor response time and ability to develop joint torque at the knee and ankle in older women with and without a history of falls, in addition to investigating the effect of aging on these capacities. We assessed 18 young females, 21 older female fallers and 22 older female non-fallers. The peak torque, rate of torque development, rate of electromyography (EMG) rise, reaction time, premotor time and motor time were obtained through a dynamometric assessment and simultaneous electromyography. Surface EMGs of the rectus femoris (RF), vastus lateralis (VL), biceps femoris (BF), gastrocnemius lateralis (GL) and tibialis anterior (TA) muscles were recorded. Knee extension and flexion peak torques were lower in older fallers than in non-fallers. Knee extension and flexion and ankle plantarflexion and dorsiflexion peak torques were lower in both older groups than in the younger group. The rate of EMG rise of the BF and the motor time of the TA were lower and higher, respectively, in older fallers than in the younger adults. The time to reach peak torque in knee extension/flexion and ankle plantarflexion/dorsiflexion and the motor times of the RF, VL, BF and GL were higher in both older groups than in the younger groups. The motor time of the TA during ankle dorsiflexion and the knee extension peak torque were the major predictors of falls in older women...

Efeitos imediatos da técnica de mobilização com movimento aplicada na articulação tíbio-peroneal inferior na amplitude de dorsiflexão em indíviduos com história de entorse do tornozelo

Paço, Maria Amélia Alves do
Fonte: Faculdade de Ciências Médicas. Universidade Nova de Lisboa Publicador: Faculdade de Ciências Médicas. Universidade Nova de Lisboa
Tipo: Dissertação de Mestrado
Publicado em //2011 POR
Relevância na Pesquisa
27.82%
RESUMO: A entorse do tornozelo é uma das lesões músculo-esqueléticas mais comuns. A limitação da amplitude de dorsiflexão tem sido demonstrada como uma das consequências desta lesão, bem como um dos factores contribuintes para a recorrência. Vários estudos têm demonstrado que o membro lesado de indivíduos com história de entorse, apresenta uma falha posicional anterior do peróneo. Um estudo realizado em cadáveres revelou que um deslizamento póstero-superior ao nível da articulação tibioperoneal inferior pode contribuir para aumentar a amplitude de dorsiflexão. Está descrita uma técnica de terapia manual que realiza o deslizamento póstero-superior do maléolo lateral associada ao movimento activo de flexão dorsal (MWM). No entanto, não existe, até à data, nenhum estudo que investigue a efectividade desta MWM em indivíduos com limitação da FD e história de entorse unilateral do tornozelo. Desenho de estudo: Ensaio clínico aleatorizado e controlado por placebo, duplamente cego. Objectivos: Avaliar os efeitos imediatos da MWM na articulação tibio-peroneal inferior na amplitude de flexão dorsal e no deslizamento posterior do astrágalo em indivíduos com história de entorse unilateral do tornozelo e limitação da flexão dorsal. O protocolo experimental foi aplicado uma única vez e os seus efeitos comparados com uma intervenção placebo. Metodologia: Uma amostra de 30 indivíduos com história de entorse unilateral e limitação da amplitude de flexão dorsal foi aleatoriamente distribuído por dois grupos: grupo MWM e grupo placebo. Foram avaliados o deslizamento posterior do astrágalo e a avaliação da amplitude de flexão dorsal em carga. As avaliações foram realizadas imediatamente antes e após a intervenção. Resultados: Não foram encontradas diferenças significativas entre os grupos na avaliação inicial (baseline). A realização da one-way ANCOVA revelou que...

Rigidity and dorsiflexion of the neck in progressive supranuclear palsy and the interstitial nucleus of Cajal.

Fukushima-Kudo, J; Fukushima, K; Tashiro, K
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /09/1987 EN
Relevância na Pesquisa
27.38%
Rigidity and dorsiflexion of the neck are typical signs in progressive supranuclear palsy, but the responsible areas in the brain are unknown. To examine whether bilateral lesions of the interstitial nucleus of Cajal (INC) in the midbrain tegmentum contribute to the signs of patients with progressive supranuclear palsy, we have made bilateral INC lesions in cats and tried to correlate these studies with clinical and pathological data, including our case of progressive supranuclear palsy. Bilateral INC lesioned cats showed dorsiflexion of the neck and impairment of vertical eye movement, similar to progressive supranuclear palsy patients. Analysis of the previous clinical-pathological studies and our case have shown that dorsiflexion of the neck in progressive supranuclear palsy patients was correlated more with INC lesions than lesions of the basal ganglia.

Motor adaptation during dorsiflexion-assisted walking with a powered orthosis

Kao, Pei-Chun; Ferris, Daniel P.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
27.58%
A robotic ankle-foot orthosis (AFO) that provides powered assistance could adjust to varying gait dynamics much better than a rigid AFO. To provide insight into how humans would adapt to a powered AFO, we studied the response of neurologically intact subjects walking with an active dorsiflexion assist orthosis proportionally controlled by tibialis anterior electromyography (EMG). We examined the two mechanical functions of ankle dorsiflexors in gait (power absorption at heel strike and power generation at toe-off) by recruiting two groups of healthy subjects: Group One, called Continuous Control, (n=5) had dorsiflexion assistance both at the initial heel contact and during swing; Group Two, called Swing Control, (n=5) had the assistance only during swing. We hypothesized both groups of subjects would reduce tibialis anterior EMG amplitude with practice walking with the powered dorsiflexion assist. Ten healthy subjects were fitted with custom-made orthoses that included an artificial pneumatic muscle providing dorsiflexor torque. We collected lower body kinematics, EMG, and artificial muscle force while subjects walked on a treadmill for two 30-minute training sessions. We found that subjects walked with increased ankle dorsiflexion by 9 degrees but showed different adaptation responses of the two tibialis anterior EMG bursts. The first EMG burst around heel strike had ~28% lower amplitudes (p<0.05) but the second EMG burst during swing had similar amplitudes. These results provide baseline data of EMG controlled dorsiflexion assist in neurologically intact humans that can be used to guide future studies on neurologically impaired individuals.

Anterior ankle arthroscopy, distraction or dorsiflexion?

de Leeuw, Peter A. J.; Golanó, Pau; Clavero, Joan A.; van Dijk, C. Niek
Fonte: Springer-Verlag Publicador: Springer-Verlag
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
27.7%
Anterior ankle arthroscopy can basically be performed by two different methods; the dorsiflexion- or distraction method. The objective of this study was to determine the size of the anterior working area for both the dorsiflexion and distraction method. The anterior working area is anteriorly limited by the overlying anatomy which includes the neurovascular bundle. We hypothesize that in ankle dorsiflexion the anterior neurovascular bundle will move away anteriorly from the ankle joint, whereas in ankle distraction the anterior neurovascular bundle is pulled tight towards the joint, thereby decreasing the safe anterior working area. Six fresh frozen ankle specimens, amputated above the knee, were scanned with computed tomography. Prior to scanning the anterior tibial artery was injected with contrast fluid and subsequently each ankle was scanned both in ankle dorsiflexion and in distraction. A special device was developed to reproducibly obtain ankle dorsiflexion and distraction in the computed tomography scanner. The distance between the anterior border of the inferior tibial articular facet and the posterior border of the anterior tibial artery was measured. The median distance from the anterior border of the inferior tibial articular facet to the posterior border of the anterior tibial artery in ankle dorsiflexion and distraction was 0.9 cm (range 0.7–1.5) and 0.7 cm (range 0.5–0.8)...

Autogenic EMG-Controlled Functional Electrical Stimulation for Ankle Dorsiflexion Control

Yeom, Hojun; Chang, Young-Hui
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
27.21%
Our objectives were to develop and test a new system for the potential for stable, real-time cancellation of residual stimulation artefacts (RSA) using surface electrode autogenic electromyography-controlled functional electrical stimulator (aEMGcFES). This type of closed-loop FES could be used to provide more natural, continuous control of lower extremity paretic muscles. We built upon work that has been done in the field of FES with one major technological innovation, an adaptive Gram-Schmidt filtering algorithm, which allowed us to digitally cancel RSA in real-time. This filtering algorithm resulted in a stable real-time estimation of the volitional intent of the stimulated muscle, which then acted as the direct signal for continuously controlling homonymous muscle stimulation. As a first step toward clinical application, we tested the viability of our aEMGcFES system to continuously control ankle dorsiflexion in a healthy subject. Our results indicate positively that an aEMGcFES device with adaptive filtering can respond proportionally to voluntary EMG and activate forceful movements to assist dorsiflexion during controlled isometric activation at the ankle. We also verified that normal ankle joint range of movement could be maintained while using the aEMGcFES system. We suggest that real-time cancellation of both primary and RSA is possible with surface electrode aEMGcFES in healthy subjects and shows promising potential for future clinical application to gait pathologies such as drop foot related to hemiparetic stroke.

Childhood development of common drive to a human leg muscle during ankle dorsiflexion and gait

Petersen, Tue Hvass; Kliim-Due, Mette; Farmer, Simon F; Nielsen, Jens Bo
Fonte: Blackwell Science Inc Publicador: Blackwell Science Inc
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
27.5%
Corticospinal drive has been shown to contribute significantly to the control of walking in adult human subjects. It is unknown to what extent functional change in this drive is important for maturation of gait in children. In adults, populations of motor units within a muscle show synchronized discharges during walking with pronounced coherence in the 15–50 Hz frequency band. This coherence has been shown to depend on cortical drive. Here, we investigated how this coherence changes with development. Forty-four healthy children aged 4–15 years participated in the study. Electromyographic activity (EMG) was recorded from pairs of electrodes placed over the right tibialis anterior (TA) muscle during static dorsiflexion and during walking on a treadmill (speed from 1.8 to 4.8 km h−1). A significant increase of coherence with increasing age was found in the 30–45 Hz frequency band (gamma) during walking and during static ankle dorsiflexion. A significant correlation with age was also found in the 15–25 Hz frequency band (beta) during static foot dorsiflexion. χ2 analysis of differences of coherence between different age groups of children (4–6, 7–9, 10–12 and 13–15 years of age) revealed a significantly lower coherence in the gamma band for recordings during walking in children aged 4–6 years as compared to older children. Recordings during static dorsiflexion revealed significant differences in both the beta and gamma bands for children in the 4–6 and 7–9 years age groups as compared to the older age groups. A significant age-related decrease in step-to-step variability of toe position during the swing phase of walking was observed. This reduction in the step-to-step variability of gait was correlated with increased gamma band coherence during walking. We argue that this may reflect an increased ability to precisely control the ankle joint position with age...

Reliability and Validity of a Weight-Bearing Measure of Ankle Dorsiflexion Range of Motion

Chisholm, Martin D.; Birmingham, Trevor B.; Brown, Janet; MacDermid, Joy; Chesworth, Bert M.
Fonte: University of Toronto Press Incorporated Publicador: University of Toronto Press Incorporated
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.94%
Purpose: To examine reliability and validity of the Lunge Test (LT) of dorsiflexion range of motion and determine the impact of different approaches to obtain a score on these parameters. Methods: Fifty-three patients with ankle injury/dysfunction provided initial assessment data for cross-sectional convergent and known-groups validity analysis with the Pearson coefficient (r) and paired t-test, respectively; data after 4–8 weeks of treatment for longitudinal validity analysis with coefficient r; and data 3 days later for test–retest reliability using the intra-class correlation coefficient (ICC) and minimal detectable change (MDC). LT scores were determined for the affected leg only (LTAff) and for the difference between the two limbs (LTDiff). Two strategies were used to calculate LT scores: a single series and the mean of three series of lunges. LTs were correlated with the Lower Extremity Functional Scale and Global Foot and Ankle Scale. Results: Reliability coefficients were high (ICC=0.93–0.99). The MDC=1.0/1.5 cm, LTAff/LTDiff, respectively. Cross-sectional validity was confirmed for LTDiff (r=−0.40 to −0.50). Between-limb differences (p<0.05) supported known-groups validity. Longitudinal validity was supported for both LT change scores (r=0.39–0.63). The number of series of lunges used did not impact results. Conclusions: A single series of lunges produces a reliable LT score. From a validity perspective...

Plantarflexor and Dorsiflexor Activation during Inclined Walking with and without Modified Mobilization with Movement Using Tape in Women with Limited Ankle Dorsiflexion

Yoon, Ji-Yeon; An, Duk-Hyun; Oh, Jae-Seop
Fonte: The Society of Physical Therapy Science Publicador: The Society of Physical Therapy Science
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
27.38%
[Purpose] This study compared the EMG activities of the plantarflexor and dorsiflexor muscles during inclined walking with and without modified mobilization with movement (modified MWM) using tape in women with limited ankle dorsiflexion. [Subjects] Fifteen women with limited dorsiflexion in their feet (22 feet in total) were recruited for this study. [Methods] The subjects walked with and without modified MWM using tape on a treadmill at 6 degrees with a speed of 1.25 m/s for 5 minutes. The EMG activities of the medial gastrocnemius (GCM) and tibialis anterior (TA) muscles were measured using a surface EMG system. [Results] During incline walking with modified MWM using tape, the mean EMG activity of the GCM significantly increased, and that of the TA decreased between heel strike and heel off. There was no difference between heel off and toe off in the two muscles. [Conclusions] Modified MWM using tape on the talus during incline walking could alter the muscle activities of the GCM and TA between heel strike and heel off in women with limited ankle dorsiflexion.

Influence of Walking with Talus Taping on the Ankle Dorsiflexion Passive Range of Motion

Kang, Min-Hyeok; Kim, Ji-Won; Kim, Moon-Hwan; Park, Tae-Jin; Park, Ji-Hyuk; Oh, Jae-Seop
Fonte: The Society of Physical Therapy Science Publicador: The Society of Physical Therapy Science
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.94%
[Purpose] This study investigated the effects of walking with talus taping on the ankle dorsiflexion passive range of motion (DF PROM) in individuals with limited ankle DF PROM. [Subjects] Fifteen ankles with limited DF PROM were examined. [Methods] After rigid strapping tape was applied to the ankles from the talus to the calcaneus, progressing posteriorly and inferiorly, the subjects walked on a walkway for 10 min. Using a goniometer, the ankle DF PROM was measured with the knee extended before and after walking with talus taping. The difference in ankle DF PROM between before and after walking with talus taping was analyzed using the paired t-test. [Results] The ankle DF PROM was significantly increased after walking with talus taping. [Conclusion] Our findings indicate that walking with talus taping is effective for increasing the ankle DF PROM in individuals with limited ankle DF PROM.

Ankle dorsiflexion as an fMRI paradigm to assay motor control for walking during rehabilitation

Dobkin, Bruce H.; Firestine, Ann; West, Michele; Saremi, Kaveh; Woods, Roger
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /09/2004 EN
Relevância na Pesquisa
27.5%
The ability to walk independently with the velocity and endurance that permit home and community activities is a highly regarded goal for neurological rehabilitation after stroke. This pilot study explored a functional magnetic resonance imaging (fMRI) activation paradigm for its ability to reflect phases of motor learning over the course of locomotor rehabilitation-mediated functional gains. Ankle dorsiflexion is an important kinematic aspect of the swing and initial stance phase of the gait cycle. The motor control of dorsiflexion depends in part on descending input from primary motor cortex. Thus, an fMRI activation paradigm using voluntary ankle dorsiflexion has face validity for the serial study of walking-related interventions. Healthy control subjects consistently engaged contralateral primary sensorimotor cortex (S1M1), supplementary motor area (SMA), premotor (PM) and cingulate motor (CMA) cortices, and ipsilateral cerebellum. Four adults with chronic hemiparetic stroke evolved practice-induced representational plasticity associated with gains in speed, endurance, motor control, and kinematics for walking. For example, an initial increase in activation within the thoracolumbar muscle representation of S1M1 in these subjects was followed by more focused activity toward the foot representation with additional pulses of training. Contralateral CMA and the secondary sensory area also reflected change with practice and gains. We demonstrate that the supraspinal sensorimotor network for the neural control of walking can be assessed indirectly by ankle dorsiflexion. The ankle paradigm may serve as an ongoing physiological assay of the optimal type...

Activation of brain areas following ankle dorsiflexion versus plantar flexion: Functional magnetic resonance imaging verification★

Jiang, Tianyu; Wu, Weiping; Wang, Xinglin; Weng, Changshui; Wang, Qiuhua; Guo, Yanmei
Fonte: Medknow Publications & Media Pvt Ltd Publicador: Medknow Publications & Media Pvt Ltd
Tipo: Artigo de Revista Científica
Publicado em 05/03/2012 EN
Relevância na Pesquisa
27.38%
Changes in activated areas of the brain during ankle active dorsiflexion and ankle active plantar flexion were observed in six healthy subjects using functional magnetic resonance imaging. Excited areas of ankle active dorsiflexion involved the bilateral primary motor area and the primary somatosensory area, as well as the bilateral supplementary sensory area, the primary visual area, the right second visual area, and the vermis of cerebellum. Excited areas of ankle active plantar flexion included the ipsilateral supplementary motor area, the limbic system, and the contralateral corpus striatum. Fine movements of the cerebral cortex control the function of the ankle dorsiflexion to a larger extent than ankle plate flexion, and the function of ankle plate flexion is more controlled by the subcortical area.

The influence of gastrocnemius stretching combined with joint mobilization on weight-bearing ankle dorsiflexion passive range of motion

Kang, Min-Hyeok; Lee, Dong-Kyu; Kim, Soo-Yong; Kim, Jun-Seok; Oh, Jae-Seop
Fonte: The Society of Physical Therapy Science Publicador: The Society of Physical Therapy Science
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
27.65%
[Purpose] The purpose of this study was to investigate the effect of gastrocnemius stretching combined with talocrural joint mobilization on weight-bearing ankle dorsiflexion passive range of motion. [Subjects] Eleven male subjects with bilateral limited ankle dorsiflexion passive range of motion with knee extended participated in this study. [Methods] All subjects received talocrural joint mobilization while performing gastrocnemius stretching. Ankle dorsiflexion passive range of motion was measured using an inclinometer under weight-bearing conditions before and immediately after intervention. A paired t-test was used to analyze the difference between weight-bearing ankle dorsiflexion passive range of motion pre- and post-intervention. [Results] A significant increase in weight-bearing ankle dorsiflexion passive range of motion was found post-intervention compared with pre-intervention. [Conclusion] These findings demonstrate that gastrocnemius stretching combined with joint mobilization is effective for increasing weight-bearing ankle dorsiflexion passive range of motion.

Estudio de concordancia intra e interobservador de la medición goniométrica de la dorsiflexión de tobillo

Santos Rey, Leticia
Fonte: Universidade da Corunha Publicador: Universidade da Corunha
Tipo: Trabalho de Conclusão de Curso
SPA
Relevância na Pesquisa
27.38%
Traballo fin de grao (UDC.FEP). Podoloxía. Curso 2013/2014; 1.RESUMEN ESTRUCTURADO 1.1.Objetivos 1.1.1. Objetivo principal:  Evaluar la concordancia intra e interobservador de la medición goniométrica del recorrido articular de la articulación tibioperonea astragalina (TPA) realizada por dos estudiantes del último curso del grado de podología y por un profesional de la podología con experiencia en dichas mediciones. 1.1.2. Objetivos secundarios:  Analizar que prueba de las realizadas es la más fiable para las mediciones del recorrido articular de la TPA.  Comprobar si la población de estudio alcanza los grados de normalidad de la dorsiflexión de la TPA. 1.2.Metodología Se ha estudiado un total de 57 sujetos (114 pies) sanos con un rango de edad comprendido entre 20 y 33 años pertenecientes a 3º y 4º curso del grado de podología de la Universidad de la Coruña. Se obtuvieron medidas del rango de la dorsiflexión del tobillo en descarga y en carga con un goniómetro, un inclinómetro y una cinta métrica. Las mediciones se realizaron 3 veces cada una (usándose el valor medio) y en el caso de las mediciones intraobservador la diferencia de tiempo entre las primeras mediciones y las segundas ha sido de una semana. La concordancia se determinó utilizando el Indice Kappa. Est. de concordancia intra e interobservador de la medición goniométrica DF de tobillo 6 1.3.Resultados Las medidas intraobservador de concordancia para el goniómetro con la rodilla en extensión y en flexión son 0...

Consecuencias patológicas de la limitación en la dorsiflexión de tobillo

Phillips Portasany, Brandan
Fonte: Universidade da Corunha Publicador: Universidade da Corunha
Tipo: Trabalho de Conclusão de Curso
SPA
Relevância na Pesquisa
37.21%
Traballo fin de grao (UDC.FCS). Fisioterapia. Curso 2014/2015; [Resumen] Objetivos. El objetivo del presente trabajo es realizar una revisión de la literatura científica de cara a la identificación de las consecuencias patológicas fruto de la limitación en el ROM de DF de tobillo; tanto a nivel del complejo tobillo-pie como a niveles suprayacentes Material y Métodos. Se realizó una revisión bibliográfica en las bases de datos Medline y CINAHL acotando los resultados desde el año 2009 hasta la actualidad y en habla inglesa y española. Las palabras claves utilizadas han sido “ankle”, “ankle joint”, “dorsiflexion”, “range of motion”. Resultados. Se obtiene un total de 21 resultados, de los cuales 8 corresponden a patologías del retropié, 6 a patología de rodilla, 1 de alteraciones en los dedos del pie y finalmente 6 de alteraciones propioceptivas. La patología que ha obtenido mayores resultados en la búsqueda ha sido la tendinopatía aquílea (TA) con un total de 5 artículos. Discusión/Conclusiones. La limitación en la DF de tobillo puede originar patología tanto a nivel del retropié como a nivel de rodilla y a su vez puede desencadenar alteraciones en la propiocepción que afecten tanto a nivel del complejo tobillo-pie como a MMII y tronco. A pesar de que varios resultados apoyan la existencia de un determinado rango de limitación de DF de tobillo como punto de cribado para la prevención de lesiones...

Aplicación de la técnica de mobilization with movement en estudiantes del campus Casona las Condes de la Universidad Andrés Bello que presenten limitación al movimiento de dorsiflexión de tobillo.

Cornejo Miranda, Dominique Ashly; Bermúdez, Javiera Teare; Retamal Cárdenas, Andrés Ignacio
Fonte: Universidad Andrés Bello Publicador: Universidad Andrés Bello
Tipo: Tesis
ES
Relevância na Pesquisa
27.5%
Tesis (Licenciado en Kinesiología); RESUMEN: Objetivo. El objetivo de este trabajo de investigación, es determinar si la Técnica de Mobilization With Movement logra aumentar el rango de dorsiflexión de tobillo en la población estudiantil del campus Casona Las Condes de la Universidad Andrés Bello, que presenta limitación de los rangos de dorsiflexión de dicha articulación. Método. Es un estudio epidemiológico de tipo cuasiexperimental, en el cual se realizaron mediciones con un electrogoniómetro previo y posterior a la aplicación de la técnica de Mobilization With Movement (MWM), específicamente de la dorsiflexión de tobillo en 110 individuos. Para el análisis de datos estadísticos, se utilizó el programa IBM SPSS Statistics 20, enfocándose principalmente en la distribución del Test de t de student, tanto para muestras independientes como para muestras relacionadas. Resultados. Hubo un aumento del rango de dorsiflexión de tobillo inmediato posterior a la aplicación de la técnica de MWM, con una significancia de p<0.001.

Efeitos imediatos da técnica de mobilização com movimento aplicada na articulação tibio-peroneal inferior na amplitude de dorsiflexão em indivíduos com história de entorse do tornozelo

Paço, Maria
Fonte: Repositório Comum de Portugal Publicador: Repositório Comum de Portugal
Tipo: Dissertação de Mestrado
Publicado em /04/2011 POR
Relevância na Pesquisa
27.82%
Tese de Mestrado em Fisioterapia; Introdução: A entorse do tornozelo é uma das lesões músculo-esqueléticas mais comuns. A limitação da amplitude de dorsiflexão tem sido demonstrada como uma das consequências desta lesão, bem como um dos factores contribuintes para a recorrência. Vários estudos têm demonstrado que o membro lesado de indivíduos com história de entorse, apresenta uma falha posicional anterior do peróneo. Um estudo realizado em cadáveres revelou que um deslizamento póstero-superior ao nível da articulação tibioperoneal inferior pode contribuir para aumentar a amplitude de dorsiflexão. Está descrita uma técnica de terapia manual que realiza o deslizamento póstero-superior do maléolo lateral associada ao movimento activo de flexão dorsal (MWM). No entanto, não existe, até à data, nenhum estudo que investigue a efectividade desta MWM em indivíduos com limitação da FD e história de entorse unilateral do tornozelo. Desenho de estudo: Ensaio clínico aleatorizado e controlado por placebo, duplamente cego. Objectivos: Avaliar os efeitos imediatos da MWM na articulação tibio-peroneal inferior na amplitude de flexão dorsal e no deslizamento posterior do astrágalo em indivíduos com história de entorse unilateral do tornozelo e limitação da flexão dorsal. O protocolo experimental foi aplicado uma única vez e os seus efeitos comparados com uma intervenção placebo. Metodologia: Uma amostra de 30 indivíduos com história de entorse unilateral e limitação da amplitude de flexão dorsal foi aleatoriamente distribuído por dois grupos: grupo MWM e grupo placebo. Foram avaliados o deslizamento posterior do astrágalo e a avaliação da amplitude de flexão dorsal em carga. As avaliações foram realizadas imediatamente antes e após a intervenção. Resultados: Não foram encontradas diferenças significativas entre os grupos na avaliação inicial (baseline). A realização da one-way ANCOVA revelou que...

Evaluating Foot Kinematics Using Magnetic Resonance Imaging: From Maximum Plantar Flexion, Inversion, and Internal Rotation to Maximum Dorsiflexion, Eversion, and External Rotation

Fassbind, Michael J.; Rohr, Eric S.; Hu, Yangqiu; Haynor, David R.; Siegler, Sorin; Sangeorzan, Bruce J.; Ledoux, William R.
Fonte: American Society of Mechanical Engineers Publicador: American Society of Mechanical Engineers
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
27.21%
The foot consists of many small bones with complicated joints that guide and limit motion. A variety of invasive and noninvasive means [mechanical, X-ray stereophotogrammetry, electromagnetic sensors, retro-reflective motion analysis, computer tomography (CT), and magnetic resonance imaging (MRI)] have been used to quantify foot bone motion. In the current study we used a foot plate with an electromagnetic sensor to determine an individual subject's foot end range of motion (ROM) from maximum plantar flexion, internal rotation, and inversion to maximum plantar flexion, inversion, and internal rotation to maximum dorsiflexion, eversion, and external rotation. We then used a custom built MRI-compatible device to hold each subject's foot during scanning in eight unique positions determined from the end ROM data. The scan data were processed using software that allowed the bones to be segmented with the foot in the neutral position and the bones in the other seven positions to be registered to their base positions with minimal user intervention. Bone to bone motion was quantified using finite helical axes (FHA). FHA for the talocrural, talocalcaneal, and talonavicular joints compared well to published studies, which used a variety of technologies and input motions. This study describes a method for quantifying foot bone motion from maximum plantar flexion...

Spinal mechanisms in man contributing to reciprocal inhibition during voluntary dorsiflexion of the foot.

Crone, C; Nielsen, J
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /09/1989 EN
Relevância na Pesquisa
27.82%
1. The inhibition of the soleus Hoffmann reflex (H reflex) during voluntary dorsiflexion of the foot--henceforth referred to as 'natural' reciprocal inhibition--was found to be initiated 50 ms before the onset of the EMG activity in the tibialis anterior muscle and to increase gradually during a ramp-and-hold dorsiflexion. There was a positive correlation between strength of tonic dorsiflexion and amount of 'natural' reciprocal inhibition. 2. The change of activity in the disynaptic and a long-latency group Ia inhibitory pathway and the change in presynaptic inhibition of the Ia fibres mediating the soleus H reflex were tested separately during ramp-and-hold dorsiflexion as well as during tonic dorsiflexion of the foot, and the results were compared with the development of the 'natural' reciprocal inhibition of the unconditioned soleus H reflex. 3. The disynaptic group I inhibition of soleus motoneurones was increased, as compared to rest, during the dynamic phase of a ramp-and-hold dorsiflexion movement, but the inhibition generally did not increase during tonic dorsiflexion of the foot. 4. The long-latency group I inhibition was seen only during dorsiflexion of the foot. It appeared around 50 ms before tibial anterior EMG activity and there was a positive correlation between strength of tonic dorsiflexion and amount of this long-latency inhibition. 5. Presynaptic inhibition of Ia afferents terminating on soleus motoneurones was estimated by an indirect method. The increase of presynaptic inhibition started soon after the onset of the ramp-and-hold dorsiflexion...

Avaliação do torque passivo de flexão plantar e torque ativo de flexão dorsal em ginastas rítmicas e não atletas; Evaluation of passive plantarflexion torque and active dorsiflexion torque in rhythmic gymnasts and nonathletes

GOULART, Natália Batista Albuquerque; DIAS, Caroline Pieta; LEMOS, Fernando de Aguiar; OLIVA, João Carlos; LANFERDINI, Fábio Juner; VAZ, Marco Aurélio
Fonte: Universidade de São Paulo. Escola de Educação Física e Esporte Publicador: Universidade de São Paulo. Escola de Educação Física e Esporte
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 01/09/2014 POR
Relevância na Pesquisa
27.5%
O treinamento realizado por atletas de elite acarreta demandas funcionais específicas que produzem mudanças nos tendões e nas propriedades musculares. Nas atletas de ginástica rítmica (GR) há uma exigência maior de controle motor em posições extremas de flexão plantar. Esta demanda pode alterar o torque passivo dos flexores plantares bem como influenciar na amplitude de movimento (ADM) de flexão dorsal e torque dos dorsiflexores. No presente estudo foi comparada a ADM de flexão dorsal de GR e meninas não atletas (MNA), e determinada a correlação entre o torque passivo dos flexores plantares (TPFP) e o torque ativo dos flexores dorsais (TAFD). O estudo incluiu 10 GR e 10 MNA. A ADM de flexão dorsal foi medida com um goniômetro. O TPFP e TAFD foram avaliados por meio de um dinamômetro isocinético em cinco ângulos articulares (20º, 10º, 0º, -10º e -20º). O teste T para amostras independentes foi utilizado para a comparação entre os grupos (α = 0,05). O coeficiente de correlação de Pearson indicou uma correlação negativa alta e moderada entre o TPFP e TAFD para as GR e NA, respectivamente. GR apresentaram menor ADM de flexão dorsal comparadas às MNA. O TPFP foi significativamente maior nas GR comparado as MNA. Por outro lado...