The Modeling And Analysis Of Skeletal Muscle EMG

The study of EMG (electromyography) is a subject of great interest inelectrophysiology, especially SEMG (surface electromyography), because of itsnoninvasive and testability. In neuromuscular disorders, the motor unit structure is altered by diseaseprocesses. These changes can be recognized by direct observations of the muscletissue in muscle biopsy studies. This allows one to look at the distribution of fibersaccording to the metabolic properties, loss of fibers, and change in fiber size. Thebiopsy does not give any information about individual MUs. Such information isobtained from electromyography (EMG) studies. This paper proposes a linear point current source model, namely, regarding thesingle active fiber as a series of continuous point current sources which start off fromend-plate and conduct to tendons with a constant velocity. First, we calculate theessential solution of the independent point current source in an anisotropic mediumwith the theory of electromagnetic field, and then calculate the transmembrane currentcomputing model from linear core conductor model. Finally, calculate the actionpotential of any point outer of the active fiber. The potential is defined as theconvolution of the transmembrane current and a weight function. At one time, in this paper, we analyzed the parameters of the model. Mostlyaimed at the fiber diameter, distance between the fiber and recording point, introducedthe influences for the weight function, transmembrane current and extracellularpotential resistively. Furthermore, this paper discussed the computing model of motorunit action potential and EMG. through the compare with the former testing result,testified the precision and validity of proposed model.