I have found :)
The significant EMG activity happens between 5 Hz and 450 Hz!
- Viitasalo, J. H. T., and Komi, P. V. Signal characteristics of EMG during fatigue. European Journal of Applied Physiology 37, 111–121.
- van Boxtel, A. (2001). Optimal signal bandwidth for the recording of surface EMG activity of facial, jaw, oral, and neck muscles. Psychophysiology 38, 22–34.
- De Luca, C. J. (1997). The use of surface electromyography in biomechanics. Journal of applied biomechanics.
- Merletti, R., and Di Torino, P. (1999). Standards for reporting EMG data. J Electromyogr Kinesiol.
- Komi, P. V., and Tesch, P. EMG frequency spectrum, muscle structure, and fatigue during dynamic contractions in man. European Journal of Applied Physiology 42, 41–50.
It depends on the type of electrodes that you use. The frequency content of the signals recorded using surface electrodes will be lower than that obtained using in-dwelling electrodes.
I think that 0.5Hz (min) iand 350 Hz (max) the most widely accepted frequency limits of the EMG power spectra
What is the application? While 0.5 to 350 may be theoretically a good number, for many applications, the range is much lower. It also depends on the muscle that you are studying, and whether the activity is isometric. Also, the inter-electrode distance is a very important factor (Melaku et al, IEEE TNSRE, 2003).
electrodes placed into the muscle will have a higher bandwidth than those on the surface, fat and skin are quite good low pass filters. This is problem is even greater when brain activity is considered as bone is such a good filter.
You are right Mr. Pedro. The significant EMG activities happen between 5-450Hz. I have always found a flat (almost) power spectrum beyond 500Hz. However, I have seen the significant changes in the EMG activities due to muscle contractions(for both isometric and dynamic) at the frequency band of 10-350Hz.
The frequency choice is dependent on the application. For many applications, frequency range of 15 to 45 hz is enough.
The frequency range is between 5Hz an 450Hz.As I have designed basic circuit for it.You can also add notch filter to remove basic frequency which is disturbing continuously.
It is pleasantly surprised to find this question here, although the original question was in 2013. Here I give the result I obtained from a monkey's soleus using implanted electrodes. From the power spectrum plot, we can see the range is from 5 to 450 Hz, peaked at about 200 Hz. Anyway, this is on monkey and not surface.
10-500 Hz is widely accepted, I found that using 20-450 Hz you eliminate a lot of artifacts of the signal...
also, I've seen applications using 250 Hz for sampling frequency which yields a low pass of maximum 125 Hz (this is 20-125 Hz), if you're only using the envelope it can work with this but to make it sturdier I'd say to add an accelerometer and/or gyroscope...
From a recent project work of EMG signal processing, I found the range in between 10Hz to 250 Hz and observed a dominant power peak at 80 Hz.
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