Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Study by LIJ obstetrician confirms taller women are more likely to have twins

26.09.2006
An obstetrician who specializes in multiple-birth pregnancies has confirmed that taller women are more likely to have twins. The suspected culprit is insulin-like growth factor, which has been positively linked to both height and twinning.

By comparing the heights of women who had given birth to twins or triplets with the average height of women in the United States, Gary Steinman, MD, PhD, an attending physician at Long Island Jewish (LIJ) Medical Center, found that the multiple-birth mothers averaged more than an inch taller. The study was published in the September issue of the Journal of Reproductive Medicine.

"Any circumstance that affects the amount of available insulin-like growth factor so as to modify the sensitivity of the ovary to follicle-stimulating hormone appears to govern the rate of spontaneous twinning," said Dr. Steinman.

Insulin-like growth factor (IGF) is a protein that is released from the liver in response to growth hormone. It increases the sensitivity of the ovaries to follicle stimulating hormone, thereby increasing ovulation. Some studies also suggest that IGF may help embryos survive in the early stages of development.

Among its many effects in the body, IGF stimulates cells in the shaft of long bones to grow. Previous studies have demonstrated that people with short stature have significantly lower levels of IGF. Countries with taller women have higher rates of twinning compared to countries with shorter women.

In the current study, Dr. Steinman compared the heights of 129 women who gave birth to identical or fraternal twins or triplets -- 105 had twins and 24 had triplets -- with the average height of women in the United States, as reported by the National Center for Health Statistics. The multiple-birth mothers averaged 5 feet 5 inches tall, more than an inch taller than the U.S. average for adult females of about 5 feet 3 ¾ inches. While the effect of IGF on the ovaries likely involves fraternal, or dizygotic, twins, they were not distinguished from identical, or monozygotic, pregnancies in this study. Dizygotic twin pregnancies account for about two-thirds to three-quarters of all spontaneous multiple pregnancies in a random population, therefore the results of this study predominantly, but not exclusively, represent fraternal twins.

In the previous study in his series on the mechanisms of twinning, Dr. Steinman found that women who consume animal products, specifically dairy, are five times more likely to have twins. Cows, like humans, produce IGF in response to growth hormone and release it into the blood, and the IGF makes its way into their milk.

Dr. Steinman has been invited to speak next month about IGF and twinning at the three-day workshop "Milk, Hormones and Human Health." The meeting, to be held in Boston from Oct. 23-25, is sponsored by the Harvard Center for Cancer Prevention at the Harvard School of Public Health and the McGill University Centre for Cancer Prevention.

Christina Verni | EurekAlert!
Further information:
http://www.nshs.edu

More articles from Studies and Analyses:

nachricht Win-win strategies for climate and food security
02.10.2017 | International Institute for Applied Systems Analysis (IIASA)

nachricht The personality factor: How to foster the sharing of research data
06.09.2017 | ZBW – Leibniz-Informationszentrum Wirtschaft

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Terahertz spectroscopy goes nano

20.10.2017 | Information Technology

Strange but true: Turning a material upside down can sometimes make it softer

20.10.2017 | Materials Sciences

NRL clarifies valley polarization for electronic and optoelectronic technologies

20.10.2017 | Interdisciplinary Research

VideoLinks
B2B-VideoLinks
More VideoLinks >>>