Navegando por Palavras-chave "Biomechanical phenomena"

Agora exibindo 1 - 3 de 3
  • Imagem de Miniatura
    Item
    Acesso aberto (Open Access)
    Análise da fadiga muscular localizada em atletas e sedentários através de parâmetros de freqüência do sinal eletromiográfico
    (Universidade Federal de São Paulo (UNIFESP), 2008-04-30) Santos, Marcelo Cláudio Amaral [UNIFESP]; Arida, Ricardo Mario [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Though the analysis in the frequency domain of the Electromyographic Signal (EMG) was used in the characterization of the localized muscular fatigue process their application, specifically the Median Frequency (MF), is rarely explored in the sports. The objective of this study was to verify the viability in the application of the EMG signal, through of the frequency domain analysis, as parameter for determination and differentiation of the behavior of located muscle fatigue. Two groups of subjects one characterized as athletes (n=12) and other as sedentary (n=12), were submitted to analysis based in procedures executed in three different experimental situations, all involving the 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; where was monitored the behavior of MF in the first three (Fmedi) and last three seconds (Fmedf) of the EMG signal of anterior tibial muscle during the fatigue test. During the 10 seconds of the recovery test MF was calculated regarding the whole period (Fmedr) this parameter was used to calculate the Recuperation Muscle Index (RMI). The results showed that Fmedf presented a low value in relation to Fmedi in both groups (p <0.05). Also the value of Fmedi and Fmedf for the athlete group presented larger higher value in comparison with the sedentary group (p <0.05). The mean value and standard deviation of RMI for the athlete group were 62.1% ±28.7 and for sedentary group was 55.2% ±27.8 (p>0.05). In general terms 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 the located muscle fatigue behavior.
  • Nenhuma Miniatura disponível
    Item
    Somente Metadadados
    Considerações sobre o tratamento cirúrgico das instabilidades cervicais por aramagem e artrodese posterior: com enfoques biomecânicos
    (Universidade Federal de São Paulo (UNIFESP), 1990) Puertas, Eduardo Barros [UNIFESP]; Koberle, Gottfried [UNIFESP]
  • Imagem de Miniatura
    Item
    Acesso aberto (Open Access)
    The impact of tibial torsion measurements on gait analysis kinematics
    (Sociedade Brasileira de Ortopedia e Traumatologia, 2014-10-01) Lucareli, Paulo Roberto Garcia; Santos, Nadia Maria; Godoy, Wagner De; Bernal, Milena Moreira Barreto; Paes, Ângela Tavares; Ramalho Junior, Amancio; Universidade Nove de Julho; Universidade de São Paulo (USP); Hospital Israelita Albert Einstein; Universidade Federal de São Paulo (UNIFESP)
    Objective:To measure and compare tibial torsion values as assessed by goniometry and three-dimensional kinematics. In addition, the impact of each one of these measurements on kinematic and kinetic results for normal gait was determined.Methods:Twenty-three healthy and fully ambulatory patients were assessed, 11 women and 12 men, from 20 to 40 years old. Data were collected at a laboratory for the three-dimensional analysis of movement with 10 cameras and two force plates. Tibial torsion measurements were obtained using goniometry and three-dimensional kinematics based on the Plug-in Gait model. Afterwards, both procedures were compared, and the impact of each result was assessed on the kinematic and kinetic modeling of the knee and ankle.Results:Pearson's linear correlation coefficient (r=0,504) showed a moderate correlation between the three-dimensional kinematics and goniometry, and between the changes in the measurements. Regarding the processed kinematic and kinetic results for every torsion position, no significant differences were noticed among any of the studied variables (p>0.05).Conclusion:Although statistical correlation among tibial torsion angles by goniometry and three-dimensional kinematic were moderate, kinematic and kinetic analysis of the joints did not reveal any significant changes. Level of Evidence I, Diagnostic Studies - Investigating a Diagnostic Test.