Precursors of Preterm Birth: Comparison of Three Ethnic Groups in the Middle East and the United States

Badr, Lina Kurdahi; Abdallah, Bahia; Mahmoud, A Hemida

doi:10.1177/0884217505276303

Cited by 25 publications

(23 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Previous studies suggest that recreational physical activity is either not associated(37-50) or associated with lower risk of preterm birth. (51-57) When limited to studies that have measured frequency, intensity, duration, and type of activity the results suggest reduced risk of preterm birth. (50, 53, 54, 56-61) Of these studies, the most precise estimate was from a survival analysis (hazard ratio: 0.82 [95% CI: 0.76, 0.88] for any exercise versus none) and the authors found no dose-response association.…”

Section: Discussionmentioning

confidence: 99%

A Prospective Study of the Association Between Vigorous Physical Activity During Pregnancy and Length of Gestation and Birthweight

Jukic

Evenson

Daniels

et al. 2011

Matern Child Health J

View full text Add to dashboard Cite

Summary Current U.S. pregnancy-related physical activity recommendations do not provide specific guidance for vigorous intensity activity. Our objective was to examine the associations between vigorous physical activity during pregnancy and length of gestation and birthweight. Women were recruited before 10 weeks gestation. At 13-16 weeks gestation, participants reported the type, frequency, and duration of their typical weekly vigorous physical activities. Activity domains included recreational, occupational, household, and child/adult care. Infant birth date was obtained from medical or vital records; if unavailable, self-report was used. Birthweight (from vital records) was studied among term births. We analyzed gestational age among 1,647 births using discrete-time survival analysis. We used logistic and linear regression to analyze preterm birth (birth at <37 weeks) and birthweight, respectively. Vigorous recreational activity was associated with longer gestation (any vs. none, hazard ratio (HR) [95% CI]: 0.85 [0.70, 1.05]) and we did not detect any dose-response association. Higher frequency of vigorous recreational activity sessions (adjusted for total volume of activity) was associated with a decreased odds of preterm birth (≥ 4 sessions/week vs. 0 or 1, OR [95% CI]: 0.08 (0.006, 1.0). Birthweight was not associated with physical activity measures. In summary, vigorous physical activity does not appear to be detrimental to the timing of birth or birthweight. Our data support a reduced risk of preterm birth with vigorous recreational activity, particularly with increased frequency of recreational activity sessions. Future studies should investigate the components of physical activity (i.e. intensity, duration, and frequency) in relation to birth outcomes.

show abstract

Section: Discussionmentioning

confidence: 99%

A Prospective Study of the Association Between Vigorous Physical Activity During Pregnancy and Length of Gestation and Birthweight

Jukic

Evenson

Daniels

et al. 2011

Matern Child Health J

View full text Add to dashboard Cite

show abstract

“…One possible cause of lower duration of the second stage of labor is low infant birth weight 23 . In the present study, mean newborn weight was not significant for both groups.…”

Section: Discussionmentioning

confidence: 99%

Effect of pelvic floor muscle training on labour and newborn outcomes: a randomized controlled trial

Dias¹,

Driusso²,

Aita³

et al. 2011

Rev. bras. fisioter.

View full text Add to dashboard Cite

“…The primary reason for not using age-matched normals was due to the fact that no pregnancies which deliver at 28-32 weeks can be considered as true normals. Most, if not all, of them have some underlying pathology (Barrett, 2002;Badr et al, 2005;Crider et al, 2005). Although risk factors for preterm birth include among others preterm premature rupture of membranes (pPROM), cervical insufficiency, pathologic uterine distension, uterine anomalies, intrauterine infection/inflammation and social factors, the final common pathway appears to be activation of the inflammatory cascade (Engel et al, 2005), which was yet another reason for not using age-matched normals.…”

Section: Discussionmentioning

confidence: 99%

Nitration of p38 MAPK in the placenta: association of nitration with reduced catalytic activity of p38 MAPK in pre-eclampsia

Webster

Brockman

Myatt

2006

MHR: Basic Science of Reproductive Medicine

View full text Add to dashboard Cite

Peroxynitrite, a potent pro-oxidant formed from the interaction of superoxide and nitric oxide, has been widely reported to be nitrating tyrosine residues in proteins resulting in the formation of nitrotyrosine. Biological nitration of tyrosine, a footprint of oxidative injury, has been found to occur in various pathological states including pre-eclampsia, a leading cause of maternal mortality and increased perinatal mortality. Oxidative stress is a major contributor to endothelial dysfunction in pre-eclampsia. Previously, we have demonstrated increased nitrotyrosine immunostaining in placental villous vascular endothelium, surrounding vascular smooth muscle and villous stroma from pre-eclamptic or diabetic pregnancies. Immunoprecipitation (IP) with antinitrotyrosine antibodies followed by immunoblot analysis identified increased nitration of phospho-p38 mitogen-activated protein kinase (MAPK) in the pre-eclamptic placenta. The catalytic activity of p38 MAPK and concentration of phospho-p38 MAPK was also found to be reduced in placentae from pre-eclamptic pregnancies. Comparison of peptide masses of a 42-kDa protein obtained by mass spectrometry with masses of a theoretical tryptic digest of p38 MAPK that was modified by phosphorylation and nitration identified the protein to be p38 MAPK.

show abstract

Precursors of Preterm Birth: Comparison of Three Ethnic Groups in the Middle East and the United States

Cited by 25 publications

References 53 publications

A Prospective Study of the Association Between Vigorous Physical Activity During Pregnancy and Length of Gestation and Birthweight

A Prospective Study of the Association Between Vigorous Physical Activity During Pregnancy and Length of Gestation and Birthweight

Effect of pelvic floor muscle training on labour and newborn outcomes: a randomized controlled trial

Nitration of p38 MAPK in the placenta: association of nitration with reduced catalytic activity of p38 MAPK in pre-eclampsia

Contact Info

Product

Resources

About