During my investigation it was often hard to discriminate one single MUP in muscles mentioned above (e.g. also in iliopsoas). Do you have the same experience and how do you deal with the question to evaluate MUP amplitude in these muscles?
Thank you in advance!
Dear Dr. Zipser,
Here is a paper, which has proposed a technique- cepstrum of bispectrum- to estimate the appearance of MUAPs in Rectus Femoris and Vastus Lateralis muscles during rest and in six other contraction positions in both real wired- EMG and surface-EMG signals. Hope it helps!
Regards,
Ping Zhou and Zev Rymer @ Northwestern did alot of work involving MUAP discrimination. Also Kevin Engelhart and Bernie Hudgins have done some very interesting things with Wavelet analysis, which might be applicable.
Your question suggests that you are working in Clinical EMG. If so, the answer to your question depends very much upon the equipment you use. Both Key Point and Sinergy equipments have the Multi MUAPA (multi Motor Unit Action Potential Analysis) and the others most likely will implement this program too. The advantage of this program is that you can collect 25-30 MU Potentials in 5-10 minutes. In addition, there are reference values (amplitude, duration, number of phases, etc) of most of the muscles commonly examined in clinical routine. You can do it also record and measure individual MUPs but this technique is time consuming and cumbersome.
The most relevant parameter (variable) is the mean duration of the PUM and stability of the components of the MUP. Changes in amplitude are less useful. The MUPs must sound crispy; by slightly repositioning the needle you can get better potentials. Concerning the technical aspects, indications and procedures, I would advise you the Jun Kimura text (Electrodiagnosis in Diseases of Nerve and Muscle, Oxford University Press, 4th edition, 2013). If you are planning to do Single Fiber EMG the book is Single Fiber EMG by E. Stalberg, J Trontelj, and Don Sanders, 3rd Edition,2010. Edshagen Publishing House, Fiskebäckskil, Sweden (WWW.SFEMG.INFO ). You ALSO can visit Key Point Club (it´s very easy to find it in Google.) Good luck
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