Create Account | Sign In: Author or Forum

 
News  |  Journals  |  Conferences  |  Opinion  |  Articles  |  Forums  |  Twitter    
 
Category: Pediatrics | Research | Medical Students | News

Back to Health News

Humans’ Tree-Dwelling Ancestors May Have Also Walked Upright

Last Updated: March 23, 2010.

 

Bipedalism possible more than 3 million years ago, findings suggest

Share |

Comments: (0)

Tell-a-Friend

 

  Related
 
Bipedalism possible more than 3 million years ago, findings suggest.

TUESDAY, March 23 (HealthDay News) -- Fossil footprints made 3.6 million years ago are the earliest direct evidence that our tree-dwelling ancestors walked on two legs, U.S. researchers say.

The fossil footprints preserved in volcanic ash were discovered in Tanzania more than 30 years ago. Since then, experts have debated whether the tracks indicate a modern human-like bipedal stride.

In this new study, researchers built a sand trackway in a laboratory and filmed volunteers as they walked across the sand in a normal manner and in a crouched, chimpanzee-like gait. Three-dimensional models of the footprints were compared with the fossil footprints, which were found to be similar to modern human footprints.

"This more human-like form of walking is incredibly energetically efficient, suggesting that reduced energy costs were very important in the evolution of bipedalism prior to the origins of [modern humans]," study author David Raichlen, an assistant professor in the University of Arizona School of Anthropology, said in a university news release.

"What is fascinating about this study is that it suggests that, at a time when our ancestors had an anatomy well-suited to spending a significant amount of time in the trees, they had already developed a highly efficient, modern human-like mode of bipedalism," study co-author Adam Gordon, of the University of Albany, said in the release.

The study was published online March 22 in the journal PLoS One.

More information

Minnesota State University has more about human evolution.

SOURCE: University of Arizona, news release, March 19, 2010

Copyright © 2010 HealthDay. All rights reserved.


Previous: Health Tip: Finding a Birthing Class Next: Healthy Living Adds Years to Life

Reader comments on this article are listed below. Review our comments policy.


Submit your opinion:

Name:

Email:

Location:

URL:

Remember my personal information

Notify me of follow-up comments?

advertisement.gif (61x7 -- 0 bytes)
 

Are you a Doctor, Pharmacist, PA or a Nurse?

Join the Doctors Lounge online medical community

  • Editorial activities: Publish, peer review, edit online articles.

Doctors Lounge Membership Application

 
     

 advertisement.gif (61x7 -- 0 bytes)

 

 

Useful Sites
MediLexicon
  Tools & Services: Follow DoctorsLounge on Twitter Follow us on Twitter | RSS News | Newsletter | Contact us
Copyright © 2001-2014
Doctors Lounge.
All rights reserved.

Medical Reference:
Diseases | Symptoms
Drugs | Labs | Procedures
Software | Tutorials

Advertising
Links | Humor
Forum Archive
CME | Conferences

Privacy Statement
Terms & Conditions
Editorial Board
About us | Email

This website is certified by Health On the Net Foundation. Click to verify. This site complies with the HONcode standard for trustworthy health information:
verify here.