Relationship between the Electrical Stimulation Frequency Optimal Value and the Magnitude of the Maximum Phase Shift, and the Force Developed by the Muscle

Electrical stimulation restorative treatment’s process of neuromuscular system’s diseases very important. Choice of the signal frequency-time parameters and its coordination with the biological tissues electrical parameters one of the main factors in the practice of electrical stimulation. The purpose of this article was to optimize the electrical action parameters in accordance with the muscles’s functional state. The studies were conducted on the biceps brachii of the upper limb of the subject and included: study of dependence of the effort developed by the muscle on the amplitude of the stimulating signal’s voltage and study of the interelectrode impedance phase-frequency characteristic of the upper limb biceps brachii of the subjects. As a result, relationship between the optimal value of the electrical stimulation frequency causing the maximum effort of the muscle and the magnitude of the phase shift of the phase-frequency characteristic of the tissues was determined. Dependence of the effort developed by the muscle during electrical stimulation on the amplitude of the stimulating signal magnitude at different values of electrical stimulation frequency was studied. It was established that with an increase of the stimulating signal amplitude, frequency of the phase-frequency characteristic’s extremum of the biotissue increases and accordingly the frequency of electrical stimulation that causes maximum muscle effort increases. Results of the work can be used in the design of electrical stimulation systems for musculoskeletal system with feedback.

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