Motor unit characteristics (amplitude, area, duration, phase, turn and polyphasic MUAP) were measured using a monopolar needle and narrow bandpass (500Hz to 10kHz) in paracervical muscles in 51 subjects (26 men and 25 women) aged from 18 to 66 years (mean age, 39.14 years). Motor unit action potentials (MUAP) were analyzed with the decomposition method.

1) Mean values of MUAP parameters were as follows: amplitude 745.24±295.19μV, area 491.51±218.23μVms, duration 4.14±0.56msec, phase 3.48±0.35, turn 3.18±0.49, polyphasic 14.28±11.49%.

2) Mean values of amplitude and area were significantly higher in men than in women (P<0.01).

3) Mean values of MUAP parameters of paracervical levels were not significantly different.

4) MUAP parameters showed no significant correlation with age.

Paracervical MUAP analysis can be used to increase the diagnostic yield.