Abstract
With pregnant individuals at different stages, cases of abortion and premature delivery, and cases of abdominal inflation, the oblique and straight muscles were investigated electro-myographically with the following results.
1. At the very early stage of pregnancy, the EMG of the oblique muscles showed very weak or no, activity at rest. With the progress of pregnancy, the activity weakened further and disappeared totally after the2nd month. The activity reappeared at about5to20hours before the onset of uterine pains.
2. Active electrical discharges were observed in the cases of abortion and premature delivery. The cases of ascites and ovarian cyst, or pneumoperitoneum showed active discharges in the oblique muscles and sometimes in the straight muscles.
3. The three pregnancy tests were performed on the early stage individuals and the results were compared with the findings of EMG. A fair possibility to use the EMG method for the early detection of pregnancy was demonstrated.
