Dear all,
I am conducting a research project to examine the EMG signals from erector spinae and upper trapezius muscles. I encounter a problem in analyzing the EMG data. Currently, I am using a 64-channel EMG electrode. However, I read some related papers that obtained 59 or 51 bipolar EMG signals from the electrode and then calculated the respective RMS, mean frequency of power spectrum, etc. How can I calculate those 59 bipolar signals from adjacent channels in 64-channel matrix? I contacted a technician from the manufacturer and he suggested me to collect data using reference monopolar mode and then to compute the differential in the direction I want. However, he did not give me the details. Can someone teach me how to calculate those bipolar signals and what is the meaning of computing the differential in the direction I want? Thanks in advance for your help.
Arnold
Dear Arnold,
Assuming the electrode grid was placed with its columns along with the muscle fibres, the bipolar signals can be calculated by subtracting each signal in the nth row from the signals in the (n-1)th row (n=2, 3, ..., number of rows). For details, please refer to my papers: https://www.researchgate.net/profile/Lin_Xu38.
Good luck,
Lin Xu
Hi Arnold,
You can refer to the following papers:
- https://www.researchgate.net/publication/258319774_Sensitivity_evaluation_of_HOS_parameters_by_data_fusion_from_HD-sEMG_grid?ev=prf_pub
- https://www.researchgate.net/publication/258319746_Muscle_force_estimation_using_data_fusion_from_high-density_SEMG_grid
Furthermore, herein you can also found all what you have to know about EMG:
http://www.delsys.com/educational-resources/knowledge-center/publications/
Good Luck!
Fouaz
Conference Paper Sensitivity evaluation of HOS parameters by data fusion from...
Conference Paper Muscle force estimation using data fusion from high-density SEMG grid
Thank you Lin and Fouaz for your suggestions. I will read your suggested readings.
Arnold
The issue of HDsEMG analysis is extensively discussed in the book "Surface Electromyography" edited by R Merletti and D. Farina and published by J Wiley and IEEE press.
The electrode array should have the C columns (or R rows) parallel to the fiber direction.
If monopolar channel acquisition is performed (each electrode with respect to a far away reference), C-1 (or R-1) differential channels may be obtained by calculating the difference between each monopolar channel and the next along C (or R) depending on the desired information to be obtained by further processing .
R Merletti
Politecnico di Torino
Dear Roberto,
Thank you for pointing me in the right direction.
Arnold
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