The invention relates to medicine, and more particularly to physiotherapy, neurology, traumatology, orthopaedics, rehabilitation and sports medicine, and can be used for relaxing spasmed muscles when treating patients with different conditions of the musculoskeletal and nervous systems, and also for prophylaxis in the social sphere. For this purpose, relaxed antagonist muscles are subjected to a stimulating electric impulse effect at an impulse frequency of from 15 to 35 Hz, with an impulse signal duration of from 5 to 60 μs and a working signal level of from 5 to 75% of the strength of a signal at which the patient feels a vibration. Spasmed agonist muscles are subjected to a relaxing thermal effect at a temperature of from 42 to 60° C. In addition, the segments of the spinal cord responsible for innervating the agonist-antagonist muscle pairs undergoing treatment are subjected to a thermal effect at a temperature of from 42 to 60° C. The agonist-antagonist muscle pairs and the segments of the spinal cord responsible for innervating the agonist-antagonist muscle pairs can be acted on simultaneously and alternately. The stimulating electric impulse effect and the relaxing effect can be carried out on individual regions of the body or on all regions simultaneously. The method provides effective physiological relaxation of spasmed muscles by means of a synergistic effect resulting from a combination of effects which engage the central nervous system that regulates and alters the physiological state of the tissues of agonist-antagonist muscle pairs.
