My clients find this such a great concept. Personally, it makes so much sense, esp. to me in terms of women who "don't experience the urge to push." I suspect many would given time for baby/mom's body to complete whatever adjustements they experience in NAP and then go on. The Zang citation does not use the term "NAP" but is clearly discussing the phenomenon. Also worth noting, it is discussed in the Childbirth Education text / Maternity Nursing text I use. Can't recall if it is both or just one right now. very, very tired.
Citation access via : http://www.ncbi.nlm.nih.gov/pubmed/12388957
Zhang J et al. Reassessing the labor curve in nulliparous women. Am J Obstet Gynecol 2002 Oct; 187:824-8.
Abstract:
"RESULTS: Our average labor curve differs markedly from the Friedman curve. The cervix dilated substantially slower in the active phase. It took approximately 5.5 hours from 4 cm to 10 cm, compared with 2.5 hours under the Friedman curve. We observed no deceleration phase. Before 7 cm, no perceivable change in cervical dilation for more than 2 hour was not uncommon. The 5th percentiles of rate of cervical dilation were all below 1 cm per hour. The 95th percentile of time interval for fetal descent from station +1/3 to +2/3 was 3 hours at the second stage. CONCLUSION: Our results suggest that the pattern of labor progression in contemporary practice differs significantly from the Friedman curve. The diagnostic criteria for protraction and arrest disorders of labor may be too stringent in nulliparous women."
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 Homebirthin' Doula-ing, CBE-ing, Aspiring Midwife Conneticut Momma to two littles (1/06 and 4/08) I'm rarely around here, but I try to "stop in" monthly or so. So  : the site!!
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