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:8/14/2018)... ... August 13, 2018 , ... NRD, LLC – NRD® is ... Ionizing Gun. , The ionizing gun features ergonomic design and rugged construction. ... filter and electropolished OSHA-compliant tip. This can be cleanroom packaged (P-2021-5502) or normally ...
(Date:8/14/2018)... ... August 14, 2018 , ... From ... movie “Wonder,” to a better understanding of congenital heart defects, 3-D printing is ... the latest special issue of Birth Defects Research (DOI: 10.1002/bdr2.1367). ...
(Date:8/7/2018)... ... 06, 2018 , ... Nurse practitioners and ... their healthcare careers in the past year, according to the second annual survey ... jobseekers with a wide variety of career- and employment-related resources including physician/candidate database, ...
Breaking Biology News(10 mins):
(Date:7/24/2018)... ... ... R3 Stem Cell is now offering regenerative therapies for COPD lung disease ... Certified providers, with outcomes significantly improving patient quality of life. , Traditional therapies for ... help repair and regenerate damaged lung tissues. Stem cell therapy for COPD ...
(Date:7/24/2018)... ... 24, 2018 , ... On August 6, 2018, BioMedGPS will ... Not just a pretty face, SmartTRAK 3.0’s latest improvements were inspired by its ... world’s first online and real-time data portal that specializes in providing competitive market ...
(Date:7/22/2018)... ... July 19, 2018 , ... Mitotech ... with Essex Bio-Investment for Phase 3 clinical program in Dry Eye Disease. Under ... SkQ1 with approximately $17m allocated towards the first Phase 3 study starting as ...
(Date:7/22/2018)... ... July 20, 2018 , ... ... automation and IT solutions with 150 employees on both the east and west ... Program. Superior Controls met the high criteria for application expertise, operational excellence ...
Breaking Biology Technology:
Cached News: