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Continuous-time EMG Quantification During Isometric Contraction

The integrated EMG (IEMG) is the most widely used method to estimate the degree of muscular activity. However, the results of any given method of quantification are limited to the relation between 5 or 6 different discrete force levels and IEMG or other quantified electromyography (EMG). Moreover, the shape, the accuracy and the repoducibility of these relationships are inconsistent. Therefore, we propose a novel spectrum probability frequency (SPF) algorithm which can estimate the muscle force in a continuous manner and also design two principles to achieve significant improvements in the quality of EMG quantification. It is concluded that our method allows an accurate estimation of quadriceps muscle force, even when high noisy EMG data are used.