Navigation Links
Adapting to pregnancy played key role in human evolution, study shows
Date:12/13/2007

AUSTIN, TexasThe human spine evolved differently in males and females in order to alleviate back pressure from the weight of carrying a baby, according to research spearheaded at The University of Texas at Austin.

The lumbar differences are documented for the first time in the Dec. 13 issue of Nature.

The researchers believe the adaptation first appeared at least two million years ago, in the early human ancestor Australopithecus. The male-female difference does not appear in chimpanzees, meaning the evolution to walking upright led to the adaptation.

"Natural selection favored this adaptation because it reduces extra stress on a pregnant female's spine," said University of Texas at Austin anthropologist Liza Shapiro, who conducted the research with graduate student Katherine K. Whitcome, now a post-doctoral fellow at Harvard University. "Without the adaptation, pregnancy would have placed a heavier burden on back muscles, causing considerable pain and fatigue and possibly limiting foraging capacity and the ability to escape from predators."

Harvard anthropologist Daniel Lieberman also contributed to the study, which shows the key differences between males and females appear in the lower back, or lumbar portion of the spine.

Human spines have a unique forward curve in the lumbar region, but the curve extends across more vertebrae in females. That helps offset harmful forces that might occur on the spine when pregnant women lean back or hyperextend their spines to balance the weight of the fetus, Shapiro said. The joints between the vertebrae also are larger in females and angled differently than in males to better support the extra weight.

"Any mother can attest to the awkwardness of standing and walking while balancing pregnancy weight in front of the body," Shapiro said. "Yet our research shows their spines have evolved to make pregnancy safer and less painful than it might have been if these adaptations
'/>"/>

Contact: Liza Shapiro
liza.shapiro@mail.utexas.edu
512-471-4206
University of Texas at Austin
Source:Eurekalert

Page: 1 2

Related medicine news :

1. HIV therapy in pregnancy-data support WHO recommendations
2. Treating diabetes during pregnancy can break link to childhood obesity
3. Treating Diabetes During Pregnancy Could Lead to Thinner Kids
4. 15% of Women Struggle With Pregnancy-Related Depression
5. Pregnancy may increase the risk of developing binge eating disorder
6. Pregnancy may slow -- not accelerate -- progression to AIDS
7. Study indicates pregnancy does not harm chances of survival from cancer
8. Kaiser Permanente Study Shows One in Seven Women are Depressed Before, During, or After Pregnancy
9. IVF technique enables pregnancy without multiple births, Stanford researchers find
10. Maternal Mortality Declining in Middle-income Countries; Women Still Die in Pregnancy and Childbirth in Low-income Countries
11. Pancreas May Be Key to Pregnancy-Linked Diabetes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/2/2014)... (PRWEB) October 02, 2014 Recently, BambooIndustry.com, ... unveiled its new collection of bamboo floors . ... for a lot of its products at the moment. ... is up to 26 percent off. The promotion will ... bamboo floors ( http://www.bambooindustry.com ) are all made by ...
(Date:10/2/2014)... 02, 2014 Originally considered alternative ... is becoming increasingly popular with consumers. This has ... Poultry Farming industry in Australia. According to ... organic meat has surged over the past five ... the farming level.” Over the five years through ...
(Date:10/2/2014)... have pinpointed a molecule that may trigger potentially life-threatening ... say this finding could offer a target for new ... Most asthma attacks (80 percent to 90 percent) are ... the British researchers. Most of these are rhinoviruses, which ... The researchers found that a specific molecule called IL-25 ...
(Date:10/2/2014)... Dennis Thompson HealthDay Reporter ... of developing celiac disease isn,t reduced by breast-feeding. Nor will ... gluten to an infant,s diet help prevent celiac disease. ... studies in the Oct. 2 New England Journal of ... that a child could avoid celiac disease if mothers breast-feed ...
(Date:10/2/2014)... by scientists at The University of Nottingham could lead ... painkiller. , A drug resulting from the research, published ... offer new hope to sufferers of chronic pain conditions ... painkillers are currently available. , The work, led by ... Sciences, in collaboration with David Bates, Professor of Oncology ...
Breaking Medicine News(10 mins):Health News:BambooIndustry.com: Great Bamboo Floors At Discounted Rates 2Health News:Organic Livestock and Poultry Farming in Australia Industry Market Research Report Now Available from IBISWorld 2Health News:Organic Livestock and Poultry Farming in Australia Industry Market Research Report Now Available from IBISWorld 3Health News:Organic Livestock and Poultry Farming in Australia Industry Market Research Report Now Available from IBISWorld 4Health News:New Clues to How Colds Can Spur Asthma Attacks 2Health News:Infant's Early Diet Doesn't Change Celiac Disease Risk, Study Finds 2Health News:Infant's Early Diet Doesn't Change Celiac Disease Risk, Study Finds 3Health News:Medical discovery first step on path to new painkillers 2
... high-dose technology targets tumor tissue, experts say , MONDAY, ... doesn,t harm the sexual function of prostate cancer patients, ... Cancer Center in Philadelphia tracked 155 men with intermediate- ... (IMRT), a technique that more precisely targets the tumor. ...
... The implementation of the Physical Agents Directive 2004/40/EC ... diagnosis and treatment Europe wide. Last Fridays publicly ... brakes on a feared future for Magnetic Resonance ... dialogue prior to policy is paramount , ...
... emerging threats to global health and ... diseases, NEW YORK, Oct. 29 The ... achievements in public health. However, the,increased incidence and ... and the re-emergence of tuberculosis, present critical,health challenges ...
... major study published in the November,2007 edition of the ... who completed a study using the Brava System increased,their ... breast size. This key,finding was based on a medical ... M.D. and Alexandra Kaider, M. Sc. The study is ...
... reminder program, TORONTO, Oct. 29 /PRNewswire/ - ... Today! reminder program for its Linessa(R) and,Nuvaring(R) contraceptive ... that helps them remember their contraceptives and,Organon Canada ... and patients. Organon Canada initiated the Remind ...
... of the Achilles tendon can experience a reduction in ... dextrose solution, according to a recent study conducted by ... Chronic tendinosis is a common overuse injury which can ... tendons throughout the body, said Norman J. Maxwell, MD, ...
Cached Medicine News:Health News:Prostate Cancer Radiotherapy Won't Affect Sexual Function 2Health News:Controversial physical agents directive postponed 2Health News:Charlie Rose Science Series to Focus on the Challenge of Researching and Implementing Effective Treatments for Diseases of the Developing World 2Health News:Charlie Rose Science Series to Focus on the Challenge of Researching and Implementing Effective Treatments for Diseases of the Developing World 3Health News:Charlie Rose Science Series to Focus on the Challenge of Researching and Implementing Effective Treatments for Diseases of the Developing World 4Health News:Newly Published Study in Leading Medical Journal Further Confirms the Brava System's Non-Surgical Breast Enhancement Effectiveness 2Health News:Telecommunications Technology Boosts Revenue Generation by Billions and Builds Positive Brand Experience 2Health News:Telecommunications Technology Boosts Revenue Generation by Billions and Builds Positive Brand Experience 3Health News:Ultrasound-guided injections help ease chronic Achilles tendon pain 2
(Date:10/1/2014)... BOSTON and NOTTINGHAM, England ... CBRX ) today announced that its subsidiary, ... to Clinical Trials platform at the annual CPhI/ICSE Worldwide ... which aims to support companies with the rapid development ... The new enabling technologies screening platform, which incorporates the ...
(Date:10/1/2014)... ALTO, Calif. , Oct. 1, 2014  Varian ... that it will report results for the fourth quarter ... trading on Wednesday, October 22, 2014.  The news release ... interested parties at 2:00 p.m. PT.  The news release ... be available on the company website at: www.varian.com/investor ...
(Date:10/1/2014)... SAN JOSE, Calif. , Oct. 1, 2014  SI-BONE, ... the iFuse Implant System, ® a minimally invasive surgical ... sacroiliac (SI) joint, today announced the expansion of its European ... of Mr. Eric Schaber as General Manager, Germany.  ... , currently vice president of Europe , ...
Breaking Medicine Technology:Columbia Laboratories' UK Subsidiary To Launch New Development Platform At CPHI 2Columbia Laboratories' UK Subsidiary To Launch New Development Platform At CPHI 3Varian Medical Systems Schedules Fourth Quarter FY2014 News Release and Conference Call 2SI-BONE, Inc. Announces European Expansion with Appointment of Eric Schaber as General Manager, Germany and Formation of GmbH 2SI-BONE, Inc. Announces European Expansion with Appointment of Eric Schaber as General Manager, Germany and Formation of GmbH 3SI-BONE, Inc. Announces European Expansion with Appointment of Eric Schaber as General Manager, Germany and Formation of GmbH 4
... reference laboratory and a worldwide leader in ... an extensive test menu of highly complex ... anatomic pathology. Owned by the University of ... half of the nation's university teaching hospitals ...
... reference laboratory and a worldwide leader in ... an extensive test menu of highly complex ... anatomic pathology. Owned by the University of ... half of the nation's university teaching hospitals ...
... reference laboratory and a worldwide leader in ... an extensive test menu of highly complex ... anatomic pathology. Owned by the University of ... half of the nation's university teaching hospitals ...
... ARUP Laboratories is a national reference ... laboratory research and development. ARUP offers an ... unique medical tests in clinical and anatomic ... ARUP Laboratories' clients include more than half ...
Medicine Products: