Eventos Anais de eventos
DINAME 2023
XIX International Symposium on Dynamic Problems of Mechanics
Force estimation of electrically-stimulated rat gastrocnemius: comparison between an optimized biomechanical muscle model and bioimpedance measurements
Submission Author:
LUCIANO MENEGALDO , RJ , Brazil
Co-Authors:
LUCIANO MENEGALDO
Presenter: LUCIANO MENEGALDO
doi://10.26678/ABCM.DINAME2023.DIN2023-0084
Abstract
In the present paper, we estimated the force exerted by the rat gastrocnemius using a biomechanical muscle model formulated from muscle dynamics. The muscle model input was the electrical excitation signal delivered in bursts of 12Hz, 22Hz and 32Hz. A set of seven parameters per muscle (medial and lateral gastrocnemii) was estimated using a genetic algorithm-based optimization that minimized the force calculated by the model and the directly measured force by a load cell. Resistance and reactance bioimpedance parameters were also measured synchronously with force. The optimization reduced the force RMS error of the model from 26 to 8%. The biomechanical model presented reliable force estimations, with a correlation R=0.95 (P<0.01). Resistance and reactance also provided highly correlated signals with the measured force (R=0.91 and R=0.84, respectively).
Keywords
biomechanics, Optimization, muscle force, genetic algorithm, bioimpedance
