Study Of NMES-induced Finger Movement And Nerve Response

Cerebral cortex damage or neuromuscular disease will cause patients to lose part or all of their motor control functions.Effective rehabilitation treatment is an important clinical approach to rebuild motor function.Neuromuscular Electrical Stimulation(NMES)is a physical rehabilitation program that stimulates nerves and muscles through pulsed electrical current to contract muscles to restore their motor functions.The current NMES technology has been widely used in the reconstruction of motor functions of stroke patients and the replacement of functions in patients with spinal cord injury(SCI).Neuromuscular electrical stimulation promotes sports rehabilitation mainly through stimulation of current to induce muscle contraction and joint movement,but the mapping relationship between electrical stimulation parameters and joint movement parameters has not been fully understood;finger movement is prone to damage to fine motor functions due to neuromuscular function To study and grasp the regulation process of forearm muscle nerve electrical stimulation to finger movement and its neural response is of great significance to the clinical rehabilitation application of NMES.Aiming at the problems that need to be solved urgently in the application of NMES in regulating limb movement and fine motor control function recovery,this article carried out related experimental research with selective induction of finger movement as an example: 1)Through experiments,we compared and analyzed the kilohertz high-frequency electrical stimulation and the traditional Finger movement characteristics and subjective psychological feelings induced by low-frequency electrical stimulation of the forearm muscles to optimize the neuromuscular electrical stimulation mode of finger movement;2)Experimental design and data detection of kinematic parameters that selectively induce finger movements under four stimulation intensity levels Analyze and study the characteristics of finger movement to explore the relationship between stimulation intensity and electrical stimulation to regulate finger movement;3)Record and analyze the range of movement,movement speed and sensory motor zone EEG signals that induce middle finger extension under the action of three different stimulation durations.The changes in the speed of finger movement and the changes in nerve response induced by continuous electrical stimulation were comparatively studied.The research results show that: 1)Under the same level of current intensity,the low-frequency mode induces a greater degree of motor response than the high-frequency electrical stimulation mode,but high-frequency stimulation is superior to low-frequency stimulation in terms of stimulation perception,stimulation resolution,and comfort evaluation.Stimulation helps to increase patient acceptance of NMES.At the same time,the performance of high frequency is also better than low frequency in terms of selectively evoking finger movement.Therefore,high frequency electrical stimulation is used for the follow-up study of this article;2)Compare the finger movement induced under four stimulation intensity levels.The range of motion of the finger keeps increasing,but the range of motion of the finger increases non-linearly with the intensity of electrical stimulation.The time required for the finger to reach the maximum flexion and extension state shortens with the increase of the stimulation intensity;3)By comparing the movement of the fingers under the three time lengths Performance,finger movement induced by continuous stimulation needs to go through a period of rapid growth,a period of rapid increase in the range of finger motion,and a period of gradual decline in speed,but the range of motion continues to increase,of which the period of rapid growth has a better duration The main effect of continuous electrical stimulation after the rapid growth period is to maintain the continuous movement of the fingers;4)Further time-frequency analysis of the EEG signal shows that the three stimulation durations can trigger the time-correlation of the sensory motor cortex.Synchronization phenomenon(Event-related desynchronization,ERD).This paper explores the effects of NMES stimulation time,intensity and other parameters on finger movement and its regulation characteristics.Based on the optimization of the forearm stimulation site and stimulation range,electrical stimulation induces finger movement characteristic parameters and the time-frequency changes of the central nervous system response.Through analysis,the main characteristics of finger movement controlled by neuromuscular electrical stimulation and the effect of stimulation duration on brain nerve activity are initially recognized,which provides a certain research foundation for the application of electrical stimulation to the control and recovery of human fine movements.