Comparação da análise miográfica sonora com a força muscular
Carregando...
Arquivos
Data
2010-11-30
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
Os músculos estriados esqueléticos, através de suas propriedades de contratilidade, extensibilidade e elasticidade, formam o principal motor das articulações nos seres humanos, através da tração exercida no tendão ou na aponeurose. Os músculos controlam, coordenam e realizam os movimentos articulares. A força produzida pelos músculos pode ser estimada através das alavancas realizadas pelo membro, considerando-se o torque de cada força, quando o músculo se contrai, parte da energia desta contração será dissipada na forma de som. A presente pesquisa tem como objetivo principal desenvolver um sistema para avaliar o sinal acústico muscular e comparar com a força produzida em uma célula de carga pela alavanca do membro superior. Os músculos selecionados para esta pesquisa foram os flexores do cotovelo, pela facilidade de acesso e de posicionamento. Foram coletados os sinais acústicos e do esforço realizado de 16 indivíduos de ambos os sexos, sendo 9 do sexo masculino e 7 do sexo feminino, saudáveis, com idade entre 18 e 35 anos, sem histórico de doenças neurológicas, cardiovasculares, não praticantes de atividade física que produzisse a hipertrofia dos músculos flexores do cotovelo. Foi desenvolvido um sistema para avaliação do sinal acústico muscular utilizando como sensor um estetoscópio adaptado com um microfone, simultaneamente à aquisição do torque produzido pelos flexores do cotovelo e avaliado por uma célula de carga. A presente pesquisa permitiu identificar que as principais freqüências acústicas da contração dos flexores do cotovelo estão na faixa de 10 a 15 Hz quando a contração equivale de 75 a 100% da força máxima para o sexo feminino e de 50 a 100 % da força máxima para o sexo masculino e na faixa de 5 a 10 Hz quando a contração equivale de 25 a 50 % da força máxima para o sexo feminino e 25 % da força máxima para o sexo masculino...
Striated skeletal muscles, through their properties of contractility, extensibility and elasticity, are the main driver of the joints in humans, through the traction exerted on the tendon or aponeurosis, muscle control, coordinate and carry out joint movements. The force produced by muscles can be estimated using from the levers held by the member, considering the torque of each force when the muscle contracts, this contraction of the energy is dissipated in the form of sound. The main objective of this research is to develop a system to evaluate the acustic signal and compare it with the muscular force produced in a load cell by the lever of the upper limb. The muscles selected for this research were elbow flexors, because of the easy access and positioning. Acoustic signals were collected and the effort made to 16 individuals of both sexes. We analyzed 9 male and 7 female, healthy and aged between 18 and 35 years old with no history of neurological and cardiovascular disease and not engaged in physical activity that could develop hypertrophy of the elbow flexor muscles. A system was developed for evaluation of the acoustic signal using muscle as a sensor adapted stethoscope with a microphone, simultaneously with the aquisition of the torque produced by the elbow flexor and evaluated by a load cell. This research has identified that the main acoustic frequencies of contraction of the elbow flexors are in the range of 10 to 15 Hz when the contraction equals 75 to 100% of maximum force for females and 50 to 100% of maximum force to males and in the range 50 to 10 Hz when the contraction equals 25 to 50% of maximum force for females and 25% of maximum force for males, as well as the correlation of the acoustic signals of males female with a coefficient less than 4. It was concluded that the acoustic signal muscle has specific characteristics for different levels of intensity of muscle... (Complete abstract click electronic access below)
Striated skeletal muscles, through their properties of contractility, extensibility and elasticity, are the main driver of the joints in humans, through the traction exerted on the tendon or aponeurosis, muscle control, coordinate and carry out joint movements. The force produced by muscles can be estimated using from the levers held by the member, considering the torque of each force when the muscle contracts, this contraction of the energy is dissipated in the form of sound. The main objective of this research is to develop a system to evaluate the acustic signal and compare it with the muscular force produced in a load cell by the lever of the upper limb. The muscles selected for this research were elbow flexors, because of the easy access and positioning. Acoustic signals were collected and the effort made to 16 individuals of both sexes. We analyzed 9 male and 7 female, healthy and aged between 18 and 35 years old with no history of neurological and cardiovascular disease and not engaged in physical activity that could develop hypertrophy of the elbow flexor muscles. A system was developed for evaluation of the acoustic signal using muscle as a sensor adapted stethoscope with a microphone, simultaneously with the aquisition of the torque produced by the elbow flexor and evaluated by a load cell. This research has identified that the main acoustic frequencies of contraction of the elbow flexors are in the range of 10 to 15 Hz when the contraction equals 75 to 100% of maximum force for females and 50 to 100% of maximum force to males and in the range 50 to 10 Hz when the contraction equals 25 to 50% of maximum force for females and 25% of maximum force for males, as well as the correlation of the acoustic signals of males female with a coefficient less than 4. It was concluded that the acoustic signal muscle has specific characteristics for different levels of intensity of muscle... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Biomecânica, Estetoscópio, Muscular strength, Muscular acoustic, Stethoscope
Como citar
CUNHA, Marcos Guimarães de Souza. Comparação da análise miográfica sonora com a força muscular. 2010. 89 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Engenharia de Guaratinguetá, 2010.