Chu J, Chan R C, Bruyninckx F
Arch Phys Med Rehabil. 1987 Jan;68(1):36-40.
This paper reports on the effects of an increase in size of the recording surface of monopolar needles on motor unit potentials (MUPs). The teflon coating of the TECA monopolar needles MG37 and MF37, commonly used in clinical electromyography, was progressively denuded to increase the length of the recording tip to 2, 3, 5, and 10 times the normal exposure, with resultant increase in the area of the recording portion. Low threshold MUPs obtained on minimal contraction from the tibialis anterior were analyzed for amplitude, duration, area, phases, turns, peak duration, and index. The amplitude and area of the MUP showed the most change, both decreasing with progressive denudation. The number of turns and phases were also reduced, more for the MF than for the MG needle. Duration, peak duration, and index showed insignificant changes. These findings give further support to the use of duration for representation of the MUP, since this is the most stable parameter even under poor recording conditions.
本文报道了单极针记录表面尺寸增加对运动单位电位（MUPs）的影响。临床肌电图常用的TECA单极针MG37和MF37的聚四氟乙烯涂层被逐渐剥去，以使记录尖端的长度增加至正常暴露长度的2、3、5和10倍，从而使记录部分的面积增加。对在胫骨前肌最小收缩时获得的低阈值MUPs进行了幅度、持续时间、面积、相位、转折、峰值持续时间和指数分析。MUP的幅度和面积变化最大，两者均随剥脱程度的增加而减小。转折数和相数也减少，MF针比MG针减少得更多。持续时间、峰值持续时间和指数显示变化不显著。这些发现进一步支持了用持续时间来表示MUP，因为即使在记录条件不佳的情况下，这也是最稳定的参数。
