Navigation Links
University of Tennessee anthropologists find American heads are getting larger
Date:5/30/2012

White Americans' heads are getting bigger. That's according to research by forensic anthropologists at the University of Tennessee, Knoxville.

Lee Jantz, coordinator of UT's Forensic Anthropology Center (FAC); Richard Jantz, professor emeritus and former director of the FAC; and Joanne Devlin, adjunct assistant professor, examined 1,500 skulls dating back to the mid-1800s through the mid-1980s. They noticed U.S. skulls have become larger, taller and narrower as seen from the front and faces have become significantly narrower and higher.

The researchers cannot pinpoint a reason as to why American head shapes are changing and whether it is primarily due to evolution or lifestyle changes.

"The varieties of changes that have swept American life make determining an exact cause an endlessly complicated proposition," said Lee Jantz. "It likely results from modified growth patterns because of better nutrition, lower infant and maternal mortality, less physical work, and a breakdown of former ethnic barriers to marriage. Which of these is paramount we do not know."

The researchers found that the average height from the base to the top of the skull in men has increased by eight millimeters (0.3 inches). The skull size has grown by 200 cubic centimeters, a space equivalent to a tennis ball. In women, the corresponding increases are seven millimeters and 180 cubic centimeters.

Skull height has increased 6.8 percent since the late 1800s, while body height has increased 5.6 percent and femur length has only increased about 2 percent. Also, skull-height has continued to change whereas the overall heightening has recently slowed or stopped.

The scientists also noted changes that illustrate our population is maturing sooner. This is reflected in the earlier closing of a separation in the bone structure of the skull called the spheno-occipital synchondrosis, which in the past was thought to fuse at about age twenty. Richard
'/>"/>

Contact: Whitney Heins
wheins@utk.edu
865-974-5460
University of Tennessee at Knoxville
Source:Eurekalert

Page: 1 2

Related biology news :

1. Rice University establishes National Corrosion Center
2. Case Western Reserve University researchers track Chernobyl fallout
3. Case Western Reserve University project ties soil conservation and river management together
4. Brown University and Women & Infants Hospital expand national childrens study to Bristol County
5. NIH selects Case Western Reserve University to participate in National Childrens Study
6. US Senate confirms Clemson University engineering Dean Esin Gulari to National Science Board
7. University professor stresses links between US Navy sonar and whale strandings
8. Scent on demand: Hebrew University scientists enhance the scent of flowers
9. University success at national engineering awards
10. University of Leicester professor adds new perspective to rainforest debate
11. Providing toilets, safe water is top route to reducing world poverty: UN University
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/29/2014)... compete with members of their own species. However, ... into their competitive ability. Some individuals are highly ... resources, while others seem to avoid competition, instead ... are left over for them. Moreover, the degree ... to fluctuate considerably over time. A theoretical study ...
(Date:10/28/2014)... in German . ... acquire sufficient food when times are lean? By studying ... d,Ivoire researchers of the Max Planck Institute for Evolutionary ... how great apes can acquire extra energy needed to ... their sleeping nests more en route to breakfast sites ...
(Date:10/28/2014)... be building a hybrid micro-grid which will integrate ... in the region, the hybrid micro-grid will test ... diesel, storage and power-to-gas technologies, and ensure these ... built under the new Renewable Energy Integration Demonstrator- ... located offshore at Semakau Landfill and is expected ...
Breaking Biology News(10 mins):Evolution of competitiveness 2Evolution of competitiveness 3The early chimp gets the fig 2The early chimp gets the fig 3NTU to build region's first renewable energy integration demonstration micro-grid 2NTU to build region's first renewable energy integration demonstration micro-grid 3
... the growing demand for organic food products has led to ... of Science, University of Copenhagen, a European research project will ... of a food product and deciding whether or not it ... as olive oil, coffee and wine are sold at a ...
... Among overweight and obese adults, a diet rich ... and other high-fiber foods, significantly reduces markers of inflammation ... by Fred Hutchinson Cancer Research Center. Such a "low-glycemic-load" ... also increases a hormone that helps regulate the metabolism ...
... Every year, a group of anti-whaling nonprofit organizations that ... spend, by conservative estimates, some $25 million on a ... And every year, commercial whaling not only continues, but ... number of whales harvested annually has doubled since the ...
Cached Biology News:Research prevents eco-fraud 2Research prevents eco-fraud 3A diet rich in slowly digested carbs reduces markers of inflammation in overweight and obese adults 2Can we save the whales by putting a price on them? 2Can we save the whales by putting a price on them? 3
(Date:10/26/2014)... October 26, 2014 The report "Protective ... Application - Global Trends & Forecast to 2019", defines ... and forecasting of volume consumed and value generated. The ... KT in 2014 to 6,701.3 KT by 2019, at ... Browse 91 market data tables and 22 figures spread ...
(Date:10/25/2014)... California (PRWEB) October 23, 2014 ... a specialty pharmaceutical company devoted to bringing new ... partnerships in 2015. , ViaDerma has developed an ... allows for rapid mass transfer of pharmaceutical active ... body to provide immediate localized therapy. The transdermal ...
(Date:10/25/2014)... According to new market research report "Data ... Enterprise, Telecom), by Design Types (Electrical, Mechanical), and ... 3, Tier 4) - Global Forecast to 2019", ... Center Construction Market into various segments with an ... report also identifies the factors driving this market, ...
(Date:10/25/2014)... The Workgroup for Electronic Data ... on the use of health IT to create ... of four new co-chairs to the organization’s Security ... ,     Peter Dumont, Senior Director – Privacy ... Deloitte Consulting LLP ,     Deidre Rodriguez, Director ...
Breaking Biology Technology:Protective Coatings Market Poised to Reach $18,431.8 Million by 2019 - Report by MarketsandMarkets 2Protective Coatings Market Poised to Reach $18,431.8 Million by 2019 - Report by MarketsandMarkets 3Protective Coatings Market Poised to Reach $18,431.8 Million by 2019 - Report by MarketsandMarkets 4ViaDerma, Inc. Announces Plans to Pursue Out-Licensing Partnerships in 2015 2ViaDerma, Inc. Announces Plans to Pursue Out-Licensing Partnerships in 2015 3Data Center Construction Market Worth $22.73 Billion by 2019 - New Report by MarketsandMarkets 2Data Center Construction Market Worth $22.73 Billion by 2019 - New Report by MarketsandMarkets 3Data Center Construction Market Worth $22.73 Billion by 2019 - New Report by MarketsandMarkets 4WEDI Appoints Four New Security and Privacy Workgroup Co-chairs 2
... works how people can tune in to a single ... solved this week in the journal Nature by ... Psychologists have known for decades about the so-called "cocktail ... in which it was coined. It is the remarkable human ...
... are single-cell plants that comprise nature,s smallest and ... thrive is water, light, and air. When bred ... to wastewater treatment to biofuels. Current microalgae breeding ... allowed by the laws of nature. Scientists at ...
... , Expanded clinical study ...   TMC435 and BMS-986094 (formerly ... in clinical trial , ... on the development of high-value treatments for infectious diseases, ...
Cached Biology Technology:How selective hearing works in the brain 2How selective hearing works in the brain 3Medivir Announces TMC435 in an Expanded Clinical Collaboration 2Medivir Announces TMC435 in an Expanded Clinical Collaboration 3Medivir Announces TMC435 in an Expanded Clinical Collaboration 4
Gamma delta T Lymphocytes Purified Anti-Porcine clone MAC320, Isotype Rat IgG 2a , kappa, 0.1 mg Consult technical datasheet for details....
...
SAPK/JNK Antibody...
Molecular Biology grade. Ideally suited for DNA and RNA separation and recovery. High gel strength. Gelling temp. 36C. Melting temp. 88C. EEO: 0.05-0.13 Resolution 0.2-40 kb; Rnase/Dnase: none detec...
Biology Products: