Whipple B, Josimovich J B, Komisaruk B R
College of Nursing, Rutgers, State University of New Jersey, Newark 07102.
Int J Nurs Stud. 1990;27(3):213-21. doi: 10.1016/0020-7489(90)90036-i.
The present exploratory study measured pain and tactile thresholds in response to mechanical stimulation of the hand before labor, during labor, and after parturition in women. In women who had Lamaze childbirth preparation (but not in women who did not have childbirth preparation), pain thresholds were significantly higher during labor (determined up to 8 cm cervical dilatation) than prior to labor and 24 hours postpartum. Tactile thresholds did not change during any of these conditions. These findings support earlier findings in this laboratory that vaginocervical mechanostimulation elevated pain thresholds in human and animal subjects, and more recent findings that pain thresholds increased in rats during delivery of individual young. The present findings suggest that an endogenous process that attenuates the pain of parturition is activated when the cervix dilates during labor.
本探索性研究测量了女性在分娩前、分娩期间和分娩后手部受到机械刺激时的疼痛和触觉阈值。在接受拉玛泽分娩准备的女性中（未接受分娩准备的女性则不然），分娩期间（宫颈扩张至8厘米时测定）的疼痛阈值显著高于分娩前和产后24小时。在这些情况下，触觉阈值均未发生变化。这些发现支持了本实验室早期的研究结果，即阴道宫颈机械刺激可提高人类和动物受试者的疼痛阈值，以及最近的研究结果，即大鼠在分娩单个幼崽时疼痛阈值会增加。目前的研究结果表明，分娩时宫颈扩张会激活一种减轻分娩疼痛的内源性过程。
