HOME >> BIOLOGY >> NEWS
Speedy elephants use a biomechanical trick to 'run' like Groucho

ve in a certain amount of time, it may still scurry with greater relative speed than a charging elephant.

"At the same Froude number, any animal, regardless of size, should be moving with the same mechanism," Hutchinson said. "It should be exerting itself in relatively the same way." A Froude number of 0.01 is slow for any animal; a Froude number of 20, fast. Most animals should switch from a walk to a run at about the same Froude number, at 0.5 or so, he said. Animals shift from a walk to a run because at faster speeds walking becomes less energetically efficient, or more mechanically stressful, than running, he said.

"The stunning thing about our elephants is they were going at a Froude number as fast as 3.4, which is over three times the dimensionless speed that an elephant should be switching from walking to running," Hutchinson said. "A horse would be well into a gallop by this point. But the elephants were still using a walking footfall pattern."

If you think of the body abstractly as just a stick swinging back and forth as it moves, he explained, its center of mass moves differently during walking compared to running. "Walking is a stiff, pendulum-like gait; the limb stays pretty straight and swings back and forth. Running is a bouncing gait in which the limb actually compresses and bounces back with a spring."

The researchers' kinematic measurements suggest that fast-moving elephants may switch from a pendulum-like gait to a bouncing gait. If they do, they fit the biomechanical definition for running.

But there's only one way to find out for sure. The animals would have to move across a force platform - a special device that registers the forces that elephants exert on the ground - to see if their center of mass swings like an inverted pendulum (as in walking) or bounces like a spring (running).

"That's a problem because the force platforms that are generally available would break if an elephant ran across them
'"/>

Contact: Dawn Levy
dawnlevy@stanford.edu
650-725-1944
Stanford University
2-Apr-2003


Page: 1 2 3 4 5 6

Related biology news :

1. Borneo elephants: A high priority for conservation
2. Dodging elephants, scorpions, mudslidesUF researcher tracks tigers
3. Cheap coffee is lousy for tigers, elephants, rhinos Science says
4. DNA evidence suggests 3 types of elephants roam Africa
5. For elephants, its not just their ears and trunk that make them unique on land
6. New program helps protect Asian elephants through crop-raiding prevention
7. Science study explores social memory in elephants
8. Counting elephants by monitoring sounds
9. Can an old gene learn new tricks?
10. Genome-wide screen reveals new tricks of old genes
11. Genetic trick adapted from viruses makes gene therapy vectors more versatile

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


(Date:9/29/2018)... ... 29, 2018 , ... ReimbursementIQ is offering two-hour executive briefings ... are expected to transform Medical Affairs, Market Access, and Marketing functions by revealing ... to individuals, employers, and other healthcare purchasers. , “Health plan buyers ...
(Date:9/28/2018)... ... September 28, 2018 , ... Purification , The fluorescent-dye labeled ... the QIAquick® PCR Purification Kit. Samples were gently mixed with 275 µL of provided ... for 1 minute at room temperature. Flow-through was discarded and 750 µL of provided ...
(Date:9/27/2018)... ... September 26, 2018 , ... ... (TME) and possibly contribute to therapeutic failures. An understanding of the immune regulatory ... immune response. In this webinar, which is sponsored by Cell Signaling Technology ...
Breaking Biology News(10 mins):
(Date:10/2/2018)... ... October 02, 2018 , ... The Alliance for Clinical ... initiated validation of standards and testing of procedures for voluntary accreditation of clinical ... ACRES VP for Quality Management Systems and Chief Quality Officer, is underway in ...
(Date:9/27/2018)... ... 2018 , ... Consumers adopting new health care technologies like ... to a new Zeldis Research and Schlesinger Group study, “The Consumerization of Health ... of fitness and health wearables, remote monitoring, patient portals and other convenience products ...
(Date:9/24/2018)... ... September 24, 2018 , ... ReGrow Helmet , the ... quality and most affordable option for hair regrowth in the comfort of one’s home. ... October 2, 2018. , The sophisticated design and advanced technology of the ReGrow ...
(Date:9/15/2018)... ... 2018 , ... Nationally recognized public accounting and consulting firm Cherry Bekaert ... the Firm’s Nashville practice, on her appointment to Launch Tennessee’s Board of ... Managing Partner of the Firm’s Nashville practice in December 2017 . In this role, ...
Breaking Biology Technology:
Cached News: