Determination of subject-specific model parameters for visco-elastic elements

Reference:

Wilson, C., King, M. A. and Yeadon, M. R., 2006. Determination of subject-specific model parameters for visco-elastic elements. 5th World Congress of Biomechanics Munich, Germany, 29 July - 4 August 2006, 39 (10), pp. 1883-1890.

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Official URL:

http://dx.doi.org/10.1016/j.jbiomech.2005.05.012

Abstract

The determination of subject-specific model parameter values is necessary in order for a computer simulation model of human motion to be evaluated quantitatively. This study used an optimisation procedure along with a kinematically driven simulation model of the contact phase in running jumps to determine the elastic parameters of segmental wobbling masses and the foot-ground interface. Kinetic and kinematic data were obtained on running jumps for height and distance performed by an elite male high jumper. Stiffness and damping coefficients of the visco-elastic elements in the model were varied until the difference between simulation and performance was minimised. Percentage differences of 6% and 9% between the simulated and recorded performances were obtained in the jumps for height and distance, respectively. When the parameters obtained from the jump for height were used in a simulation of the jump for distance (and vice versa), there was poor agreement with the recorded jump. On the other hand, a common set of visco-elastic parameters were obtained using the data from both recorded jumps resulting in a mean difference of only 8% (made up of 7% and 10%) between simulation and performance that was almost as good as the individual matches. Simulations were not overly sensitive to perturbations of the common set of visco-elastic parameters. It is concluded that subject-specific elastic parameters should be calculated from more than a single jump in order to provide a robust set of values that can be used in different simulations. (c) 2005 Elsevier Ltd. All rights reserved.

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