Abstract
The radiotelemetric investigation of intra-uterine pressure was carried out in 904 women and proved to be a method of studying uterine activity which is harmless for both mother and fetus and can be carried out at all stages of labour. The investigation of intra-uterine pressure allows uterine contractions to be judged both qualitatively and quantitatively, and all the necessary amplitude-time measurements which interest the obstetrician can be obtained. It has been shown that the intensity and duration of uterine contraction and uterine tone increases, while the intervals decrease as labour progresses. The activity of the woman in labour who frequently changes her position accelerates labour by increasing uterine tone and the frequency of contractions.