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Surface EMG-force modelling for the biceps brachii and its experimental evaluation during isometric isotonic contractions
Authors:Hua Cao  Frédéric Marin  Catherine Marque
Institution:1. Département EEA, Haute Etude de l'Ingénieur (HEI), Lille, France;2. UMR CNRS 7338: Biomécanique et Bioingénierie, Centre de Recherche Royallieu, Université de Technologie de Compiègne, BP 20529, 60205, Compiègne, France
Abstract:The aim of this study was to evaluate a surface electromyography (sEMG) signal and force model for the biceps brachii muscle during isotonic isometric contractions for an experimental set-up as well as for a simulation. The proposed model includes a new rate coding scheme and a new analytical formulation of the muscle force generation. The proposed rate coding scheme supposes varying minimum and peak firing frequencies according to motor unit (MU) type (I or II). Practically, the proposed analytical mechanogram allows us to tune the force contribution of each active MU according to its type and instantaneous firing rate. A subsequent sensitivity analysis using a Monte Carlo simulation allows deducing optimised input parameter ranges that guarantee a realistic behaviour of the proposed model according to two existing criteria and an additional one. In fact, this proposed new criterion evaluates the force generation efficiency according to neural intent. Experiments and simulations, at varying force levels and using the optimised parameter ranges, were performed to evaluate the proposed model. As a result, our study showed that the proposed sEMG–force modelling can emulate the biceps brachii behaviour during isotonic isometric contractions.
Keywords:biomechanics  sEMG  muscle force  modelling  motor unit recruitment scheme  isometric contractions  Monte-Carlo simulations  sensitivity analysis
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