Maternal positioning and fetal positioning <i>in utero</i>

Matsuo, Koji; Shimoya, Koichiro; Ushioda, Norichika; Kimura, Tadashi

doi:10.1111/j.1447-0756.2007.00524.x

Cited by 8 publications

(11 citation statements)

References 2 publications

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“…This may be related to women's third trimester preference for a lateral sleep position. [32][33][34][35][36] Indeed, comfort was a commonly cited reason for choice of late pregnancy going-to-sleep position by our participants and this is consistent with our prepublic health campaign survey. 25 However, if comfort was the main factor influencing maternal going-to-sleep position, the rate of supine position would not have decreased since our previous New Zealand surveys.…”

Section: Discussionsupporting

confidence: 89%

Modification of maternal late pregnancy sleep position: a survey evaluation of a New Zealand public health campaign

et al. 2021

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IntroductionA ‘Sleep-On-Side When Baby’s Inside’ public health campaign was initiated in New Zealand in 2018. This was in response to evidence that maternal supine going-to-sleep position was an independent risk factor for stillbirth from 28 weeks’ gestation. We evaluated the success of the campaign on awareness and modification of late pregnancy going-to-sleep position through nationwide surveys.Methods and analysisTwo web-based cross-sectional surveys were conducted over 12 weeks in 2019–2020 in a sample of (1) pregnant women ≥28 weeks, primary outcome of going-to-sleep position; and (2) health professionals providing pregnancy care, primary outcome of knowledge of going-to-sleep position and late stillbirth risk. Univariable logistic regression was performed to identify factors associated with supine going-to-sleep position.DiscussionThe survey of pregnant women comprised 1633 eligible participants. Going-to-sleep position last night was supine (30, 1.8%), non-supine (1597, 97.2%) and no recall (16, 1.0%). Supine position had decreased from 3.9% in our previous New Zealand-wide study (2012–2015). Most women (1412, 86.5%) had received sleep-on-side advice with no major resultant worry (1276, 90.4%). Two-thirds (918, 65.0%) had changed their going-to-sleep position based on advice, with most (611 of 918, 66.5%) reporting little difficulty. Supine position was associated with Māori (OR 5.05, 95% CI 2.10 to 12.1) and Asian-non-Indian (OR 4.20, 95% CI 1.27 to 13.90) ethnicity; single (OR 10.98, 95% CI 4.25 to 28.42) and cohabitating relationship status (OR 2.69, 95% CI 1.09 to 6.61); hospital-based maternity provider (OR 2.55, 95% CI 1.07 to 6.10); education overseas (OR 3.92, 95% CI 1.09 to 14.09) and primary-secondary level (OR 2.80, 95% CI 1.32 to 6.08); and not receiving sleep-on-side advice (OR 6.70, 95% CI 3.23 to 13.92). The majority of health professionals (709 eligible participants) reported awareness of supine going-to-sleep position and late stillbirth risk (543, 76.6%).ConclusionMost pregnant women had received and implemented sleep-on-side advice without major difficulty or concern. Some groups of women may need a tailored approach to acquisition of going-to-sleep position information.

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Section: Discussionsupporting

confidence: 89%

Modification of maternal late pregnancy sleep position: a survey evaluation of a New Zealand public health campaign

et al. 2021

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“…Indeed the stage of development when the fetus responds to visual stimulation is generally at 30–32 at weeks of gestation but sometimes as early as 26 weeks (Fulford et al ., ; Kiuchi et al ., ). Since the fetus adopts a lateralized position in utero at these stages of development (some two thirds are in the left occiput position; Matsuo et al ., ), it is a possibility that light stimulation is asymmetrical and may lead to asymmetries in structure of the visual pathways and visual function. Findings made using animal models support the value of looking to see whether this is the case.…”

Section: Development Of Brain Lateralizationmentioning

confidence: 99%

Asymmetry of brain and behavior in animals: Its development, function, and human relevance

Rogers

2014

Genesis

121

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Summary: Since the discovery of brain asymmetry in a wide range of vertebrate species, it has become possible to study development and expression of lateralized behavior accurately in well-controlled experiments. Several species have emerged as useful models for investigating aspects of lateralization. Discussed here are: (1) the influence of exposure to light during embryonic development on lateralization, (2) effects of steroid hormones on lateralization, (3) developmental changes in which hemisphere is controlling behavior, and (4) asymmetry in memory formation and recall. The findings have bearing on understanding the development of hemispheric specialization in humans and are likely to provide insight into dysfunctional behavior associated with weak or absent lateralization and impaired interhemispheric communication (e.g., autism, schizophrenia, and dyslexia). This review features research on chicks, pigeons, and zebrafish, with the addition of some recent evidence of lateralization in bees. Discoveries made using these species have highlighted the interaction between experience, hormones, and genetic factors during development, and have provided some of the first clear evidence of the advantage of having a lateralized brain. genesis 52:555-571,

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“…Although estimates vary, the fetus' head position is typically biased with the right ear facing outward and the corresponding left ear facing inward (Fong, Savelsbergh, van Geijn, & de Vries, 2005; Matsuo, Shimoya, Ushioda, & Kimura, 2007). Previc theorized that this position results in unequal stimulation of the otolith organs during locomotion of the mother (Previc, 1991).…”

Section: The Functional Vestibular System: Associative and Lateralize...mentioning

confidence: 99%

Extending the functional cerebral systems theory of emotion to the vestibular modality: A systematic and integrative approach.

Carmona

Holland

Harrison

2009

Psychological Bulletin

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Throughout history, vestibular and emotional dysregulation have often manifested together in clinical settings, with little consideration that they may have a common basis. Regarding vestibular mechanisms, the role of brainstem and cerebellar structures has been emphasized in the neurological literature, whereas emotion processing in the cerebral hemispheres has been the focus in psychology. A conceptual model is proposed that links research in the 2 disparate fields by means of a functional cerebral systems framework. The claim is that frontal regions exert regulatory control over posterior systems for sensation and autonomic functions in a dense, interconnected network. Impairment at levels within the system is expected to influence vestibular and cognitive processes depending on the extent of frontal regulatory capacity. M. Kinsbourne's (1980) shared cerebral space model specifies the conditions under which dysfunction of the vestibular modality will influence higher cognitive levels. A position on laterality and associative relations within the right hemisphere is proposed to explain links among dizziness, nausea, and negative emotion.

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Maternal positioning and fetal positioning in utero

Abstract: More women prefer the left lateral position during the second half of pregnancy. More fetuses are in the left occiput in utero during the late stage of pregnancy. However, no statistical relationship was observed between maternal and fetal positioning.

Cited by 8 publications

References 2 publications

Modification of maternal late pregnancy sleep position: a survey evaluation of a New Zealand public health campaign

Modification of maternal late pregnancy sleep position: a survey evaluation of a New Zealand public health campaign

Asymmetry of brain and behavior in animals: Its development, function, and human relevance

Extending the functional cerebral systems theory of emotion to the vestibular modality: A systematic and integrative approach.

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