The influence of modeling hypothesis and experimental methodologies in the accuracy of muscle force estimation using EMG-driven models

摘要: This paper discusses some methodological questions regarding the application of EMG-driven models to estimate muscle forces, for triceps surae performing isometric contractions. Ankle torque is estimated from a Hill-type model driven by EMG data, collected three components and tibialis anterior. joint synchronously dynamometer, which compared sum each force multiplied respective ankle moment arm. A protocol consisting two steps low medium/high loads used. Raw signal processed used as input model. The difference between simulated dynamometer measured calculated RMS error curves. set nominal parameters initially chosen literature (e.g., OpenSim), allows observing characteristics distribution. One possibility improve accuracy using individual parameters. We investigated effect applying simple scale factors ultrasound estimating maximum force. Other improvements are also addressed, such nonlinear formulation activation dynamics variable pennation angle. Surface signals acquisition processing can affect estimation accuracy. Electrodes positioning influence amplitude, one-channel may not represent actual excitation whole muscle. have shown that high density reduces, in cases, error.