| Reduced solar activity favors twin maternities. | |
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MedLine Citation:
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PMID: 22784464 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Mechanisms underlying effects of physical factors on twin births are unclear. The present work studied an association between monthly and yearly multiple birth rates (MBRs) in the Novosibirsk region, south-west Siberia, in relation to solar activity (sunspot numbers) and geomagnetic activity (Ap index) from 1957 to 2008. The difference was verified by comparing the yearly MBR observed in 3-year peaks (M = 7.36, SD = 0.33 per 1,000 births) and 3-year troughs (M = 8.10, SD = 0.31 per 1,000 births, p < .001) of an 11-year solar cycle. An inverse correlation (r = -.60, p < .001) was found between sunspot numbers and MBR for a lag of 1 year. Cross-spectral analysis of a 52-year time series established a common signal with the period of 10.5 years, as well as high coherence (K(2) = 0.87). The multiple regression analysis revealed a significant interaction of solar and geomagnetic effects upon the frequency of twin maternities. The results show that elevated solar activity within the 11-year cycle coinciding with the time of conception inhibits multiple births in a manner depending on geomagnetic activity. It is hypothesized that the likely mechanism underlying the association is early fetal loss induced by solar radiation/flux and its terrestrial mediators. |
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Authors:
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Vladimir N Melnikov |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Twin research and human genetics : the official journal of the International Society for Twin Studies Volume: 15 ISSN: 1832-4274 ISO Abbreviation: Twin Res Hum Genet Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-07-12 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101244624 Medline TA: Twin Res Hum Genet Country: Australia |
Other Details:
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Languages: eng Pagination: 133-7 Citation Subset: IM |
Affiliation:
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Institute of Physiology, Siberian Branch of Russian Academy of Medical Sciences, Novosibirsk, Russia. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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