HOME >> BIOLOGY >> NEWS
Study identifies energy efficiency as reason for evolution of upright walking

A new study provides support for the hypothesis that walking on two legs, or bipedalism, evolved because it used less energy than quadrupedal knucklewalking.

David Raichlen, an assistant professor of anthropology at The University of Arizona, conducted the study with Michael Sockol from the University of California, Davis, who was the lead author of the paper, and Herman Pontzer from Washington University in St. Louis.

Raichlen and his colleagues will publish the article, Chimpanzee locomotor energetics and the origin of human bipedalism in the online early edition of the Proceedings of the National Academy of Sciences (PNAS) during the week of July 16. The print issue will be published on July 24.

Bipedalism marks a critical divergence between humans and other apes and is considered a defining characteristic of human ancestors. It has been hypothesized that the reduced energy cost of walking upright would have provided evolutionary advantages by decreasing the cost of foraging.

For decades now researchers have debated the role of energetics and the evolution of bipedalism, said Raichlen. The big problem in the study of bipedalism was that there was little data out there.

The researches collected metabolic, kinematic and kenetic data from five chimpanzees and four adult humans walking on a treadmill. The chimpanzees were trained to walk quadrupedally and bipedally on the treadmill.

Humans walking on two legs only used one-quarter of the energy that chimpanzees who knuckle-walked on four legs did. On average, the chimpanzees used the same amount of energy using two legs as they did when they used four legs. However, there was variability among chimpanzees in how much energy they used, and this difference corresponded to their different gaits and anatomy.

We were able to tie the energetic cost in chimps to their anatomy, said Raichlen. We were able to show exactly why certain individuals w
'"/>

Contact: Lori Harwood
harwoodl@email.arizona.edu
520-626-3846
University of Arizona
16-Jul-2007


Page: 1 2

Related biology news :

1. Study begins to reveal clues to the cause and progression of sepsis
2. Study finds gender differences in renal and other genes contributing to blood pressure
3. Study suggests estrogen deficiency can lead to obesity-induced high blood pressure after menopause
4. Study: Sticking to the sand might not be such good, clean fun for beachgoers
5. Study points to new way to predict death risk from torn aorta
6. Study identifies new gene therapy tools for inherited blindness
7. Study finds contaminated water reaching Floridas offshore keys
8. Study sheds light on why humans walk on two legs
9. Study explains how pathogens evolve to escape detection
10. Study finds hereditary link to premenstrual depression
11. Study shows cane sugar, corn sweeteners have similar effects on appetite

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/11/2017)... -- Research and Markets has announced the addition of ... offering. ... market to grow at a CAGR of 30.37% during the period ... has been prepared based on an in-depth market analysis with inputs ... growth prospects over the coming years. The report also includes a ...
(Date:4/11/2017)... NXT-ID, Inc. (NASDAQ:   NXTD ) ("NXT-ID" or ... independent Directors Mr. Robin D. Richards and Mr. ... the company,s corporate governance and expertise. ... Gino Pereira , Chief Executive Officer said," ... and benefiting from their considerable expertise as we move forward ...
(Date:4/5/2017)... SEATTLE , April 5, 2017  The Allen ... the Allen Cell Explorer: a one-of-a-kind portal and dynamic ... large-scale 3D imaging data, the first application of deep ... edited human stem cell lines and a growing suite ... the platform for these and future publicly available resources ...
Breaking Biology News(10 mins):
(Date:4/27/2017)... SPRING, Md. and RESEARCH TRIANGLE ... United Therapeutics Corporation (NASDAQ: UTHR ) today ... of up to $250 million of the company,s common ... remain open through December 31, 2017. Purchases may be ... in privately negotiated transactions from time to time as ...
(Date:4/27/2017)... ... April 27, 2017 , ... Arrowhead Publishers is pleased to ... coming to San Diego, CA on September 27-28, 2017. Leaders from the pharmaceutical, ... advances in the treatment of various types of pain. There are also extended ...
(Date:4/27/2017)... ... April 27, 2017 , ... The ... Communication Award goes to Jayson Lusk, a consummate communicator who promotes agricultural science ... advocate for science, as he explains how innovation and growth in agriculture are ...
(Date:4/26/2017)... ... April 26, 2017 , ... Led by ... I clinical trials comes to Tampa, San Francisco and Boston in 2017. ... FDA regulated organizations such as Pfizer Inc., Teva Pharmaceuticals, Advaxis, Inc., Ocular Therapeutix ...
Breaking Biology Technology:
Cached News: