Modelo para estimativa da força e torque muscular durante a abdução do ombro

 

Daniel Cury Ribeiro

Marcelo Gregis Estivalet

Jefferson Fagundes Loss

Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil

 

RESUMO

Identificar a força produzida pelos músculos do ombro é essencial para melhor compreender os mecanismos de lesão desta articulação. O objetivo deste estudo foi aplicar um modelo matemático para estimar a força e torque de cada músculo durante o movimento de abdução máxima no plano coronal. Um indivíduo do sexo masculino, 28 anos de idade, 1,78 metros de altura e 80 kg participou neste estudo. O modelo de otimização foi estruturado no software Matlab 7.0 ® (Mathworks, Inc.) e considerou os seguintes músculos abdutores: deltóide anterior, deltóide médio, deltóide posterior, supraespinal, infraespinal e subscapular. A comparação entre torque e força muscular estimado foi feita através do teste de Kruskal-Wallis. O teste post-hoc de Friedman foi utilizado para identificar diferenças significativas (a=0,05). O músculo deltóide médio apresentou o maior pico de torque estimado (16,7 Nm), quando comparado com os outros músculos (p<0,05). O pico de torque e a força muscular estimados para o supraespinal (6,6Nm e 371N, respectivamente) foram menores que aqueles associados às três porções do deltóide (anterior, médio e posterior). Os resultados do modelo são coerentes com os dados encontrados na literatura e provêem informações importantes acerca da força muscular produzida durante a abdução do ombro.

Palavras-chave: músculo, ombro, reabilitação

 

 

ABSTRACT

Model for muscle force and moment prediction during the shoulder abduction

To identify the muscle force produced by the shoulder muscles is essential to improve the knowledge of injuries mechanisms of the shoulder joint. The aim of the present study was to apply a model to estimate the muscle force and torque, by means of a biomechanical model, during shoulder maximal abduction on the coronal plane. One male, 28 years, 1.78 meters and 85 kg participated in the present study. The optimization model was structured with software Matlab 7.0 ® (MathWorks, Inc.). The model considered as abductor muscles the following: anterior deltoideus, medium deltoideus, posterior deltoideus, supraspinatus, infraspinatus and subscapularis muscles. The comparison between muscle estimated force and moment was performed by the Kruskal-Wallis test, together with the Friedman post hoc test (a=0.05). The medium deltoideus presented the largest estimated torque (16.7 Nm), when compared with the other muscles. The peak torque and force of supraspinatus (6,6Nm e 371N, respectively) was smaller when compared to the three portions of the deltoideus muscle. The results of the model are coherent with those found in the literature and present important information about muscle force production during shoulder abduction.

Key-words: muscle, shoulder, rehabilitation

 

 

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CORRESPONDÊNCIA

Daniel Cury Ribeiro

R: Barão do Amazonas 793/ 401  -  Bairro Jardim Botânico

CEP: 90670-003

Porto Alegre – RS – Brasil

Telefone: 51-33301546/91438270

E-mail: daniel.cury.ribeiro@gmail.com