Navigation Links
Frogs' amazing leaps due to springy tendons
Date:11/16/2011

PROVIDENCE, R.I. [Brown University] Some species of frogs and many other animals are able to jump far beyond what appear to be their capabilities. The trained contestants in the frog-jumping competition in Calaveras County, Calif., come to mind, but even ordinary frogs can leap several times farther than their physiology would seem to allow.

"Muscles alone couldn't produce jumps that good," said Henry Astley, who studies the biomechanics of frog jumping at Brown University.

In a paper published in Biology Letters, Astley and Thomas Roberts, associate professor of biology, show that the key to frogs' leaping lies in their stretchy tendons: Before jumping, the leg muscle shortens, loading energy into the tendon, which then recoils like a spring to propel the frog up, up and away. Even though as much as a quarter of a frog's body mass is in its legs, it would be physically incapable of jumping as far without the tendon's services.

"In order to get truly exceptional jumping performance, you need some sort of elastic structure," said Astley, a fourth-year graduate student in Roberts's lab in the Department of Ecology and Evolutionary Biology.

Astley and Roberts examined jumps by the northern leopard frog (Rana pipiens), a pond frog common in the northeast United States. The pair implanted metal beads into the shin bone, ankle bone and leg muscle of four frogs and then recorded their leaps with 3-D X-ray video technology developed at Brown. The video, filmed at 500 frames per second and displaying the jump about 17 times slower than normal, tracks the changes in the leg muscle's length and joint movement before, during and after a jump.

As the frog readies itself to leap, its calf muscle shortens. After about 100 milliseconds, the calf muscle stops moving, and the energy has been fully loaded into the stretched tendon. At the moment the frog jumps, the tendon, which wraps around the ankle bone, releases its energ
'/>"/>

Contact: Richard Lewis
Richard_Lewis@brown.edu
401-863-3766
Brown University
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Tree frogs chill out to collect precious water
2. Fitness tests for frogs?
3. Inventions of evolution: What gives frogs a face
4. New sensor derived from frogs may help fight bacteria and save wildlife
5. Frogs evolution tracks rise of Himalayas and rearrangement of Southeast Asia
6. Research of cell movements in developing frogs reveals new twists in human genetic disease
7. Primitive frogs do a belly flop
8. Prehistoric frogs face extinction
9. Counting frogs: Why monitoring our amphibian populations is important
10. Frogs, foam and fuel: University of Cincinnati researchers convert solar energy to sugars
11. Pesticide atrazine can turn male frogs into females
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Frogs' amazing leaps due to springy tendons
(Date:10/16/2014)... 16, 2014) – Post-menopausal women experienced improvements in ... levels or genital bleeding, after 12 weeks of ... fermented soy germ-based nutritional supplement previously shown to ... new peer-reviewed pilot study reported in a poster ... scientific meeting. , "These data documented improved ...
(Date:10/15/2014)... University Mainz (JGU) as a full member, ensuring ... a significant nationwide standing in the field of ... Gutenberg University Mainz as a full member of ... and international competition for the best minds and ... proud that Mainz University has been recognized as ...
(Date:10/15/2014)... VILNIUS, Lithuania , Oct. 15, 2014 /PRNewswire/ ... identification technologies, today announced the availability of the ... . VeriLook Surveillance 3.0 provides real-time biometric face ... multiple high-resolution digital surveillance cameras. The new version ... detects and differentiates people from objects while they ...
Breaking Biology News(10 mins):S-equol supplements associated with improved measures of reproductive health in postmenopausal women 2Johannes Gutenberg University Mainz joins Germany's Gauss-Allianz as a full member 2Johannes Gutenberg University Mainz joins Germany's Gauss-Allianz as a full member 3VeriLook Surveillance 3.0 SDK Identifies Faces and Moving Objects, Differentiates Pedestrians from Other Moving Objects in Video Surveillance Systems 2VeriLook Surveillance 3.0 SDK Identifies Faces and Moving Objects, Differentiates Pedestrians from Other Moving Objects in Video Surveillance Systems 3
... human cousins, orangutans enjoy food and don,t mind working a ... even less picky. Two teams of students at Rice ... to efficiently, durably, safely and inexpensively meet the feeding needs ... "For the orangutans, we wanted to make it like a ...
... 1619, the pioneering astronomer Johannes Kepler published Harmonices Mundi ... planets and asserted that the laws of nature governing ... in music. In so doing, Kepler provided important support ... by Copernicus. In the latest issue of ...
... a game show, or just on the job, what causes ... study by researchers at the California Institute of Technology (Caltech) ... people can become so afraid of losing their potentially lucrative ... somewhat unexpected conclusion. After all, you would think that the ...
Cached Biology News:Feeding without the frenzy 2The music of the (hemi)spheres sheds new light on schizophrenia 2Why do people choke when the stakes are high? 2Why do people choke when the stakes are high? 3Why do people choke when the stakes are high? 4
(Date:10/20/2014)... Earle Martin , Chief Executive ... Ellen Teplitzky, an experienced attorney specializing in business ... has joined the firm as Director of Legal ... NDA Partners provides legal services, including research, ... top law firms and their clients in cases ...
(Date:10/19/2014)... 19, 2014 The Latin American hardware ... in Latin America with analysis and forecast of revenue. ... and is expected to reach $2,366.8 million by 2018, ... , Browse through the TOC of the Latin American ... the in-depth analysis provided. It also provides a glimpse ...
(Date:10/19/2014)... 19, 2014 NextCODE Health, which enables clinicians and ... real time, today announced the launch of its new genomic ... at the American Society of Human Genetics (ASHG) annual meeting ... sign up and apply for free beta access, visit ... benefits can be viewed here . The ...
(Date:10/19/2014)... (PRWEB) October 19, 2014 The Asian ... in Asian with analysis and forecast of revenue. The ... grow to around $463.9 million by 2018, at a ... Browse through the TOC of the Asian Automatic patient ... analysis provided. This also provides a glimpse of the ...
Breaking Biology Technology:NDA Partners Appoints Ellen Teplitzky, JD as Director of its Legal Services Practice 2The Latin American hardware encryption display market is expected to reach $2,366.8 million by 2018 - New Report by MicroMarket Monitor 2The Latin American hardware encryption display market is expected to reach $2,366.8 million by 2018 - New Report by MicroMarket Monitor 3The NextCODE Exchange: The first global, real-time system for sharing full-resolution genomic data 2The NextCODE Exchange: The first global, real-time system for sharing full-resolution genomic data 3The Asian Automatic patient billing market is estimated to grow to around $463.9 million by 2018 - New Report by MicroMarket Monitor 2The Asian Automatic patient billing market is estimated to grow to around $463.9 million by 2018 - New Report by MicroMarket Monitor 3
... If the pace of healthcare information technology adoption doesn't ... unsustainable situation regarding healthcare costs, according to John Wade, ... Healthcare Conference 2007 . , ,Within healthcare IT, a ... barriers rather than the possibilities, there is a growing ...
... . - The state's mental health statues will have ... according to Madison area health technologists. , ,Patient data ... Healthcare Conference 2007 , including one that posed the ... between different health systems would open a Pandora's ...
... a new chief information officer and vice provost for ... has been narrowed to three Midwestern finalists, according to ... Kraemer, deputy CIO and associate director of the UW-Madison ... for information services and CIO at UW-Green Bay ...
Cached Biology Technology:DHC 2007: Without fuller IT adoption, health costs might drain America's wealth 2DHC 2007: Without fuller IT adoption, health costs might drain America's wealth 3DHC 2007: Barriers to electronic data exchange include the law 2DHC 2007: Barriers to electronic data exchange include the law 3DHC 2007: Barriers to electronic data exchange include the law 4