Age, gestational age, diploma literacy, single pregnancy, 4 cm dilatation, low risk pregnancy, informed consent and lack of: premature delivery, bleeding, pre-eclampsia, diabetes, seizure, history of acute and chronic pain, professional exercise, alcohol and cigarette addiction, receipt of pain medication, history of allergy to herbal, fetal distress, clear stenosis in the pelvic floor, known psychological disease and being in the active phase of labor