Analysis of the coupling characteristics of multi-channel electromyography

In this paper, a new method-variational mode decomposition-intermuscular coherence (VMD-IMC) based on the adaptively decomposing signal into frequency band characteristis of variational mode decomposition (VMD) and intermuscular coherence (IMC) analysis is proposed. Multi-channel sEMG signals are decomposed into several intrinsic mode functions (IMF) based on VMD to describe the information on different time-frequency scales. Furthermore, the coherence of sEMG in the different characteristic frequency band are analyzed, and the significant coherent area is calculated to quantitatively describe the functional coupling characteristics of the characteristic frequency band, and then the functional link between muscles and the coordination control mechanism of the central nervous system are studied.