Comput Methods Programs Biomed - A passive movement method for parameter estimation of a musculo-skeletal arm model incorporating a modified hill muscle model.

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Resumo

In this paper we present an experimental method of parameterising the passive mechanical characteristics of the bicep and tricep muscles in vivo, by fitting the dynamics of a two muscle arm model incorporating anatomically meaningful and structurally identifiable modified Hill muscle models to measured elbow movements. Measurements of the passive flexion and extension of the elbow joint were obtained using 3D motion capture, from which the elbow angle trajectories were determined and used to obtain the spring constants and damping coefficients in the model through parameter estimation. Four healthy subjects were used in the experiments. Anatomical lengths and moment of inertia values of the subjects were determined by direct measurement and calculation. There was good reproducibility in the measured arm movement between trials, and similar joint angle trajectory characteristics were seen between subjects. Each subject had their own set of fitted parameter values determined and the results showed good agreement between measured and simulated data. The average fitted muscle parallel spring constant across all subjects was 143 N/m and the average fitted muscle parallel damping constant was 1.73 Ns/m. The passive movement method was proven to be successful, and can be applied to other joints in the human body, where muscles with similar actions are grouped together.

Resumo Limpo

paper present experiment method parameteris passiv mechan characterist bicep tricep muscl vivo fit dynam two muscl arm model incorpor anatom meaning structur identifi modifi hill muscl model measur elbow movement measur passiv flexion extens elbow joint obtain use d motion captur elbow angl trajectori determin use obtain spring constant damp coeffici model paramet estim four healthi subject use experi anatom length moment inertia valu subject determin direct measur calcul good reproduc measur arm movement trial similar joint angl trajectori characterist seen subject subject set fit paramet valu determin result show good agreement measur simul data averag fit muscl parallel spring constant across subject nm averag fit muscl parallel damp constant nsm passiv movement method proven success can appli joint human bodi muscl similar action group togeth

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