Qualitative analysis of the influence of concentric needle electrode components on motor unit potential
Keywords:Motor unit potentials, Concentric needle electrode
AbstractIn order to analyze the influence of Concentric needle electrode(CNE) components, 36 healthy volunteers were examined.MUAP parameters were analyzed after applying themanual method of extraction. The research was performedon the following muscles: m. vastus lateralis (MVL; depth ofinsertion were 0 cm/subfascial insertion and 1.5 centimetre(cm) perpendicularly (900) and obliquely (450) on muscle fibredirection, and temporal muscle (depth of insertion 0 cm/subfascial insertion and 1.5 cm rectangular (900) on musclefibre direction or parallel on fossa temporalis) on either side.In contrast to monopole montages, the qualitative EMG analysisconfirmed that EMG potential detected with CNE is notrelevant enough to determine the precise location of muscle(end-plate, tendon); compared with that of the central corewaveform, the MUAP shape recorded by CNE is usually different.It has also been confirmed that cannula, albeit in rarecases, might have a “contributing” instead of “diminishing”influence on CNE MUAP parameters, and this, in turn, mightlead to a wrong interpretation or even pathological findings. Inview of the contributing effects of CNE components we recommenda qualitative division of MUAPs of healthy persons.
Eisen A, Karpati G, Carpenter S. The motor unit profile of the rat soleus in experimental myopathy and reinnervation. Neurology. 1974;24: 878-84.
Buchtal F. The general concept of the motor unit. Res Publ Assoc Res Nerv Ment Dis. 1961;38:3-30.
Lempe V, Thiele B. Motor unit potentials of the biceps muscle in comparing right and left parameters in right- handed subjects. EEG EMG Z Elektroenzephalogr Elektromyogr Verwandte Geb. 1984;15(3):159-62.
Ekstedt J Human single muscle fiber action potentials. Acta Physiol Scand. 1964 (Suppl 226):1-96.
Stålberg E, Schwartz MS, Thiele B, Schiller HH. The normal motor unit in man. J Neurol Sci. 1976;27:291-301.
Dumitru D. Fundametal principes; Volume conduction. In: Electrodiagnostic medicine. Philadelphia: Hanley & Belfus inc. 1995. p. 29-65.
Thiele B, Bohle A. Number of spike- components contributing to the motor unit potential. EEG EMG Z Electroenzephalogr Electromyogr Verwandte Geb. 1978;9 (2):125-30.
Nandedkar S, Stålberg E, Sanders DB. Stimulation techniques in electromyography. IEEE Trans biomed Engng, BME. 1985;32:775-85.
Stålberg E, Andreassen S, Falck B, Lang H, Rosenfalck A, Trojaberg W Quantitative analysis of individual motor unit potentials – a proposition for standardized terminology and criteria for measurement. J Clin Neurophysiol. 1986;3:313-48.
Stewart C, Nandedkar S, Massey J, Gilchrist J, Barkhaus P, Sanders DB Evaluation of an automatic method of measuring features of motor unit action potentials. Muscle Nerve. 1989;12(2):141-8.
Brown WF. The physiological and technical basis of electromyography. London: Butterworth Publishers, 1984.
Dumitru D, King JC, Nandedkar SD. Concentric/monopolar needle electrode modeling: spatial recording territory and physiologic implications. Electroencephalogr Clin Neurophysiol. 1997; 105(5):370-8.
Pollak V. The waveshape of action potentials recorded with different types of electromyographic needles. Med biol Engng. 1971;9:657- 64.
Dumitru D, King JC, Nandedkar SD. Motor unit action potentials duration recorded by monopolar and concentric needle electrodes. Physiologic implications. Am J Phys Med Rehabil. 1997;76(6):488-93.