Model relating EMG signals to elbow torque during rapid loaded movement

A biomechanical model of the elbow was developed to predicted torque values present during rapid flexion and extension movements of the forearm under high inertial loads. The model uses as input multiple surface electromyographs (EMG's) collected over the biceps brachii and triceps brachii muscles and various kinematic variables. Model components include a geometric model of the elbow, a fundamental dynamic force-EMG function, a muscle length compensation function and a speed-of-shortening compensation function. Validation results are reported in terms of goodness-of-fit between predicted and measured torque values collected for three different subjects completing rapid inertially loaded movements to a specified target. Slight deviation of the predicted values from the measured torque value at low exertion levels were noted and are attributed to passive elastic elements not present in the model. In general, the validation results indicate that the elbow torque values accompanying rapid flexion and extension of the elbow can be accurately modelled as a function of measured surface EMG's.