Background & Aim: Labor pain is one of the most intensive type of pain and regarding its control still is a problem in many countries. The aim of this study is to investigate the effect of transcendental meditation on pain and length of active phase of labor in primiparous women.

Methods & Materials: This study configured as a semi-experimental clinical trial work. Samples was selected by convenient sampling method and contained as 90 primiparous women’s (45 case and 45 control) whom refer to clinic and delivery room in Fatemieh Hospital of Hamadan. Samples were divided into two random group and accomplished to experience and observation transcendental meditation method used for training pregnant woman within third trimester of pregnancy (28th-30th week) and performed by them for two time a day during 10 to 15 minutes. The case and control groups were matched according their age, education and occupation case and control group were confined to bed when they were in the beginning of active phase (3-4 cm of dilatation). Collecting of data, questionnaire information of biophysical and other equipment for recording biophysical developments and other McGill instrument was used to record severity of pain. Reliability and validity instrument in the prior researches have been test. The length of active phase was measured over maternal and recorded.

Results: The results of this study showed that there is significant differences in the level of pain at the beginning of first, second and third hour of active phase of labor in case and control group (p<0.001). Also, the length of active phase of labor showed significant difference between case and control group (p<0.001). Although, the body temperature and systolic blood pressure in two group showed no significant differences but there was meaningful differences in diastolic blood pressure (p<0.029), however this differences was in normal range. Regard to rate of breathing significant differences has been shown in case and control group (p<0.006).

Conclusion: Transcendental meditation in participated samples over this research among the mothers agony experience group has less pain within all active phase hours.