Navegando por Palavras-chave "biomecânica"

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    Análise da fadiga muscular localizada em atletas e sedentários através de parâmetros de freqüência do sinal eletromiográfico
    (Sociedade Brasileira de Medicina do Exercício e do Esporte, 2008-12-01) Santos, Marcelo Cláudio Amaral [UNIFESP]; Semeghuini, Tatiana Adamov; Azevedo, Fábio Mícolis de; Colugnati, Diego Basile [UNIFESP]; Negrão Filho, Rúben de Faria; Alves, Neri; Arida, Ricardo Mario [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); Universidade do Oeste Paulista Faculdade de Fisioterapia; Universidade Estadual Paulista (UNESP); Instituto de Ensino e Pesquisa Movimentare® Fisioterapia e Reabilitação
    Although the analysis in the frequency domain of the Electromyographic Signal (EMG) has been used in the characterization of the localized muscular fatigue process, its application, specifically the Median Frequency (MF), is rarely explored in sports. The objective of this study was to verify the viability of the EMG signal application, through its frequency domain analysis, as a parameter for determination and differentiation of the behavior of localized muscle fatigue. Two groups of subjects, one characterized as athletes (n = 12) and the other as sedentary (n = 12), were submitted to analysis based on procedures from three different experimental situations, all involving isometric exercise modality: i) maximum test for determination of the Maximum Voluntary Isometric Contraction (MVIC); ii) fatigue test, 35 sec. sustained load of 80% of MVIC; iii) recovery test, 10 sec. sustained load of 80% of MVIC. In the latter, the MF behavior in the three first (Fmedi) and three last (Fmedf) seconds of the EMG signal of tibialis anterior muscle during the fatigue test have been monitored. During the 10 seconds of the recovery test, MF was calculated regarding the whole period (Fmedr); this parameter was used to calculate the Muscular Recovery Index (MRI). The results showed that Fmedf presented lower value in relation to Fmedi in both groups (p < 0.05). Additionally, the Fmedi and Fmedf values for the athlete group were higher in comparison to the sedentary group (p < 0.05). The MRI mean value and standard deviation for the athlete group were 62.1% ± 28.7 and for the sedentary group was 55.2% ± 27.8 (p > 0.05). Therefore, the results presented in this study allow inferring the viability in the application of the frequency domain parameters of the EMG signal for the determination and differentiation of localized muscle fatigue behavior.
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    Can clinical observation differentiate individuals with and without scapular dyskinesis?
    (Associação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia, 2014-06-01) Miachiro, Newton Y.; Camarini, Paula M. F.; Tucci, Helga Tatiana [UNIFESP]; Mcquade, Kevin J.; Oliveira, Anamaria S.; Universidade de São Paulo (USP); Universidade Federal de São Paulo (UNIFESP); University of Washington School of Medicine
    Background:Altered scapular rotation and position have been named scapular dyskinesis. Visual dynamic assessment could be applied to classify this alteration based on the clinical observation of the winging of the inferior medial scapular border (Type I) or of the prominence of the entire medial border (Type II), or by the excessive superior translation of the scapula (Type III).Objective:The aim of this study was to determine if there were differences in scapular rotations (Type I and II) and position (Type III) between a group of subjects with scapular dyskinesis, diagnosed by the clinical observation of an expert physical therapist, using a group of healthy individuals (Type IV).Method:Twenty-six asymptomatic subjects volunteered for this study. After a fatigue protocol for the periscapular muscles, the dynamic scapular dyskinesis tests were conducted to visually classify each scapula into one of the four categories (Type IV dyskinesis-free). The kinematic variables studied were the differences between the maximum rotational dysfunctions and the minimum value that represented both normal function and a small dysfunctional movement.Results:Only scapular anterior tilt was significantly greater in the type I dyskinesis group (clinical observation of the posterior projection of the inferior angle of the scapula) when compared to the scapular dyskinesis-free group (p=0.037 scapular and p=0.001 sagittal plane).Conclusions:Clinical observation was considered appropriate only in the diagnoses of dyskinesis type I. Considering the lower prevalence and sample sizes for types II and III, further studies are necessary to validate the clinical observation as a tool to diagnose scapular dyskinesis.
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    Método para análise cinemática dos chutes de lactentes
    (Universidade de São Paulo, 2013-03-01) Landgraf, Jocelene de Fátima; Carvalho, Raquel de Paula [UNIFESP]; Tudella, Eloisa; Universidade Federal do Rio de Janeiro; Universidade Federal de São Paulo (UNIFESP); UFSCar
    The aims of this study were to describe the method used for the kinematic analysis of kicking movements in infants and test its feasibility of use, using the Dvideow system. To adjust the method, four infants were longitudinally videotaped at ages from one to six months in the supine position. The experiment lasted two minutes, divided into two conditions: training and observation. The Dvideow system 6.3 for image analysis was used. It was verified that the use of four video cameras was more appropriate for the visibility of two markers simultaneously, allowing 3D reconstruction of motion. Moreover, 6 plumb lines were used to calibrate the system and ensure an accuracy of 2 mm. It was concluded that the use of the Dvideow system to perform kinematic analysis of the kicking movement in infants proved to be appropriate and feasible, since this system is accessible, of low cost and easy to be used for researchers in general.