Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Duration of lactation associated with bone density

06.11.2015

Maternal bone density decreases after childbirth, but only among women who lactate for at least four months. The lactation period is unrelated to vitamin D status. A PhD thesis at Sahlgrenska Academy has explored the issue.

The most important role of vitamin D is to help maintain calcium homeostasis in the body. According to some hypotheses, there is a correlation between maternal vitamin D status and bone density during pregnancy and lactation.


Petra Brembeck, Researcher, Sahlgrenska Academy, University of Gothenburg

University of Gothenburg

A recently completed PhD thesis at Sahlgrenska Academy, University of Gothenburg, identified an association between lactation period and bone density, though unrelated to vitamin D status.

No change in vitamin D status

“We hypothesized that levels of vitamin D might decrease among women with long lactation periods, given its presence in breast milk,” says Petra Brembeck, a researcher at Sahlgrenska Academy. “But we did not identify any change in average vitamin D status during the first year after childbirth or any relationship between lactation period and vitamin D levels.”

Exposure to the sun (extrapolated from the time of the year and travel to southern latitudes) and consumption of vitamin D supplements were the only factors that affected maternal vitamin D status.

Bone density decreased

The study did find, however, that bone density decreased by as much as 4% (particularly in the lumbar spine, hip and shin) during the first 4 months after childbirth, but only if the lactation period lasted for at least that long. If lactation lasted for at least 9 months, bone density was still below baseline when followed up at 18 months.

95 women

The study monitored 95 subjects for 18 months after childbirth. Maternal bone density and vitamin D status were both assessed at each appointment.

“A longer lactation period was related to increased reduction of bone density, whereas greater body weight shown the opposite correlation,” Dr. Brembeck says. “Our findings also suggest that high calcium intake might have a protective effect against bone density changes.”

Future research will require follow-up periods of more than 18 months to determine whether women who lactate longer full recover their bone minerals after weaning or whether the changes may increase the risk of fractures later in life.

Link to thesis: https://gupea.ub.gu.se/handle/2077/39545

For additional information, feel free to contact:
Petra Brembeck, Researcher, Sahlgrenska Academy, University of Gothenburg
petra.brembeck@gu.se

Facts about the study
The study included 95 pregnant women and 20 controls who were neither pregnant nor lactating. Each of them had five appointments from third trimester of pregnancy to 18 months after childbirth. They gave blood samples to determine serum concentrations of 25-hydroxyvitamin D and responded to a questionnaire about lactation and exposure to the sun. Their bone status was assessed each time postpartum with dual-energy X-ray absorptiometry (DXA) and high-resolution peripheral quantitative computed tomography (HR-pQCT).

Weitere Informationen:

http://www.gu.se/english/about_the_university/news-calendar/News_detail/?languag...

Calle Björned | idw - Informationsdienst Wissenschaft

More articles from Health and Medicine:

nachricht Another reason to exercise: Burning bone fat -- a key to better bone health
19.05.2017 | University of North Carolina Health Care

nachricht Disrupted fat breakdown in the brain makes mice dumb
19.05.2017 | Rheinische Friedrich-Wilhelms-Universität Bonn

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

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

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

Im Focus: Using graphene to create quantum bits

In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.

In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...

Im Focus: Bacteria harness the lotus effect to protect themselves

Biofilms: Researchers find the causes of water-repelling properties

Dental plaque and the viscous brown slime in drainpipes are two familiar examples of bacterial biofilms. Removing such bacterial depositions from surfaces is...

Im Focus: Hydrogen Bonds Directly Detected for the First Time

For the first time, scientists have succeeded in studying the strength of hydrogen bonds in a single molecule using an atomic force microscope. Researchers from the University of Basel’s Swiss Nanoscience Institute network have reported the results in the journal Science Advances.

Hydrogen is the most common element in the universe and is an integral part of almost all organic compounds. Molecules and sections of macromolecules are...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

Innovation 4.0: Shaping a humane fourth industrial revolution

17.05.2017 | Event News

Media accreditation opens for historic year at European Health Forum Gastein

16.05.2017 | Event News

 
Latest News

New approach to revolutionize the production of molecular hydrogen

22.05.2017 | Materials Sciences

Scientists enlist engineered protein to battle the MERS virus

22.05.2017 | Life Sciences

Experts explain origins of topographic relief on Earth, Mars and Titan

22.05.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>