J Korean Phys Ther.  2020 Oct;32(5):307-311. 10.18857/jkpt.2020.32.5.307.

Effects of Functional Electrical Stimulation Intensity Level on Corticomuscular Coherence during Action Observation

• Kim JY
• Noh H
• Park J

• KMID: 2520079
• DOI: http://doi.org/10.18857/jkpt.2020.32.5.307

Abstract

Purpose
This study examined the effects of changes in the intensity of Functional Electrical Stimulation (FES) on CorticoMuscular Coherence (CMC) during action observation. This paper presents a neurophysiological basis for the effective intensity of FES.
Methods
Twenty-seven healthy volunteers were asked to observed a video with FES. The FES was provided with a sensory stimulation level, nerve stimulation level, and motor stimulation level. Simultaneously, an electroencephalogram (EEG) of the sensorimotor cortex and electromyogram (EMG) from the wrist extensor muscle were recorded. The peak CMC and average CMC were analyzed to compare the differences caused by the FES intensity.
Results
The peak CMC showed a significant increase in the alpha band during motor stimulation (p<0.05). The average CMC showed a significant increase in the beta band during motor stimulation (p<0.05).
Conclusion
The intensity of FES, which causes actual movement, increased the CMC during action observation. These results show that the intensity of the FES can affect the functional connection between the sensorimotor cortex and muscle.

Keyword

Observation; Electric stimulation therapy; Coherence