Premature Contractions: Are They Caused by Maternal Standing?

Schneider, K. T. M.; Huch, A.; Huch, R.

doi:10.1017/s0001566000004694

Cited by 17 publications

(7 citation statements)

References 6 publications

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“…A standing posture during the third trimester in pregnancy has been found to result in compressed pelvic vessels and a reduction in venous blood flow, resulting in uterine contractions. 32 We saw no significant increased risk for preterm birth among women who reported working rotating shifts or nights. However, women who worked nights were at a three-fold increased risk of delivering early preterm (less than 32 weeks gestation), which is consistent with the results of our spontaneous abortion analysis.…”

Section: Strengths and Weaknesses In Relation To Other Studiesmentioning

confidence: 64%

Occupational Factors and Risk of Preterm Birth in Nurses

Lawson

Whelan

Hibert

et al. 2009

Obstetric Anesthesia Digest

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Objective-We evaluated the risk of first-trimester exposures among nurses and the risk of preterm birth among participants of the Nurses' Health Study II.Study Design-Log binomial regression was used to estimate the relative risk (RR) for preterm birth in relation to occupational risk factors, adjusting for age, parity, work schedule, physical factors, and exposures to chemicals and x-rays.Results-Part-time work (<= 20 hours a week) was associated with a lower risk for preterm birth [RR=0.7, 95% confidence interval (CI) = 0.6-0.9]. Self-reported exposure to sterilizing agents was associated with an increased risk (RR=1.9, 95% CI = 1.1-3.4). Other exposures, including shift work, physical factors, anesthetic gases, antineoplastic drugs, antiviral drugs, and x-ray radiation were not associated with risk of preterm birth. Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Strengths and Weaknesses In Relation To Other Studiesmentioning

confidence: 64%

Occupational Factors and Risk of Preterm Birth in Nurses

Lawson

Whelan

Hibert

et al. 2009

Obstetric Anesthesia Digest

View full text Add to dashboard Cite

show abstract

“…Several studies have suggested physiological pathways by which standing during pregnancy might shorten gestational age. Increased uterine contractions coincide with the uterine compression of the pelvic vessels due to standing during late pregnancy (Schneider et al 1985). Furthermore, ambulatory toco‐dynamometry has shown that walking after the 30th week of pregnancy is associated with increasing frequency of uterine contractions (Grisso et al 1992).…”

Section: Discussionmentioning

confidence: 99%

Standing at work and preterm delivery

Henriksen

Hedegaard

Secher

et al. 1995

BJOG

109

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Objective Guidelines in some European countries and the United States suggest that pregnant women should avoid prolonged standing and heavy lifting in the workplace during the second and third trimester of pregnancy. However, results from epidemiological studies on this topic are ambiguous. The aim of this study was to evaluate the influence of standing and walking at work in the second trimester on preterm delivery in a population with a low frequency of other workplace hazards. Subjects and design A prospective cohort of 8711 women with singleton pregnancies was established during 1989 through 1991. Information was collected during the 16th week of pregnancy about medical and obstetrical history, general lifestyle factors and exposures at work. The analyses were restricted to 4259 respondents who worked at the 16th week. Potential confounders and effect modifiers were evaluated by stratification and multivariate analyses. Results After adjustment for confounders, women standing more than five hours per work day had an odds ratio (OR) for preterm delivery of 1.2 (95% CI 0.6 to 2.4) compared with women standing two hours or less. For walking, the OR was 1.4 (95% CI 0.7 to 2.5). Many women were unable to separate periods of standing from periods of walking; a combined measure of these two exposures was created to reflect exposure intensity. Women who reported more than five hours of both standing and walking had an adjusted OR of 3.3 (95% CI 1.4 to 8.0) compared with women who reported two hours or less on either of the exposures. No adverse effects were seen for lifting or other types of physical exertion. Conclusions Our findings suggest that standing and walking at work during the second trimester may present a particular risk for preterm delivery, and workplace guidelines are justified. Further research is needed to address the specific mechanisms by which physical exertion, including standing and walking, might cause preterm delivery.

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Section: Commentmentioning

confidence: 99%

Occupational factors and risk of preterm birth in nurses

Lawson

Whelan

Hibert

et al. 2009

American Journal of Obstetrics and Gynecology

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Objective We evaluated the risk of first-trimester exposures among nurses and the risk of preterm birth among participants of the Nurses’ Health Study II. Study Design Log binomial regression was used to estimate the relative risk (RR) for preterm birth in relation to occupational risk factors, adjusting for age, parity, work schedule, physical factors, and exposures to chemicals and x-rays. Results Part-time work (<= 20 hours a week) was associated with a lower risk for preterm birth [RR=0.7, 95% confidence interval (CI) = 0.6–0.9]. Self-reported exposure to sterilizing agents was associated with an increased risk (RR=1.9, 95% CI = 1.1–3.4). Other exposures, including shift work, physical factors, anesthetic gases, antineoplastic drugs, antiviral drugs, and x-ray radiation were not associated with risk of preterm birth. Conclusions These data suggest that sterilizing agents may be related to preterm birth, while physically demanding work and work schedule are not strong predictors.

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Premature Contractions: Are They Caused by Maternal Standing?

Cited by 17 publications

References 6 publications

Occupational Factors and Risk of Preterm Birth in Nurses

Occupational Factors and Risk of Preterm Birth in Nurses

Standing at work and preterm delivery

Occupational factors and risk of preterm birth in nurses

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