Navigation Links
Why humans choose running over walking
Date:1/5/2012

Other than Olympic race walkers, people generally find it more comfortable to run than walk when they start moving at around 2 meters per second about 4.5 miles per hour.

North Carolina State University biomedical engineers Dr. Gregory Sawicki and Dr. Dominic Farris have discovered why: At 2 meters per second, running makes better use of an important calf muscle than walking, and therefore is a much more efficient use of the muscle's and the body's energy.

Published online this week in Proceedings of the National Academy of Sciences, the results stem from a first-of-its-kind study combining ultrasound imaging, high-speed motion-capture techniques and a force-measuring treadmill to examine a key calf muscle and how it behaves when people walk and run.

The study used ultrasound imaging in a unique way: A small ultrasound probe fastened to the back of the leg showed in real time the adjustments made by the muscle as study subjects walked and ran at various speeds.

The high-speed images revealed that the medial gastrocnemius muscle, a major calf muscle that attaches to the Achilles tendon, can be likened to a "clutch" that engages early in the stride, holding one end of the tendon while the body's energy is transferred to stretch it. Later, the Achilles the long, elastic tendon that runs down the back of the lower leg springs into action by releasing the stored energy in a rapid recoil to help move you.

The study showed that the muscle "speeds up," or changes its length more and more rapidly as people walk faster and faster, but in doing so provides less and less power. Working harder and providing less power means less overall muscle efficiency.

When people break into a run at about 2 meters per second, however, the study showed that the muscle "slows down," or changes its length more slowly, providing more power while working less rigorously, thereby increa
'/>"/>

Contact: Mick Kulikowski
mick_kulikowski@ncsu.edu
919-515-8387
North Carolina State University
Source:Eurekalert

Page: 1 2

Related biology news :

1. Mineral oil contamination in humans: A health problem?
2. Escherichia coli bacteria transferring between humans and mountain gorillas
3. Pigs and dogs can bridge gap between mice and humans in developing new therapies
4. Snails and humans use same genes to tell right from left
5. As super-predators, humans reshape their prey at super-natural speeds
6. Researchers genetically link Lou Gehrigs disease in humans to dog disease
7. Ecologists report quantifiable measures of natures services to humans
8. Early humans had jaws of steel
9. Ancestral genome of present-day African great apes & humans had burst of DNA sequence duplication
10. Genetic differences between yeasts greater than those between humans and chimpanzees
11. Social support during breast-feeding helps humans have more children
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/18/2014)... for evaluation of suspected genetic conditions, whole-exome sequencing ... including detection of a number of rare genetic ... to a study appearing in JAMA . ... the American Society of Human Genetics annual meeting. ... regions of thousands of genes simultaneously using next-generation ...
(Date:10/17/2014)... available in German . ... few drugs. When treating overdoses, doctors are often limited to ... if there is a combination of drugs involved. So what ... swallows his grandmother,s pills? ETH professor Jean-Christophe Leroux from the ... an answer to this question. "The task was to develop ...
(Date:10/16/2014)... can be cultivated efficiently, they are anything but ... by monoculture cultivation is becoming increasingly evident. Despite ... form and are regarded as the sole possibility ... quite wrongfully, finds Bernhard Schmid, an ecology professor ... novel form of agriculture and forestry. After all, ...
Breaking Biology News(10 mins):Whole-exome sequencing shows potential as diagnostic tool 2Emergency aid for overdoses 2Emergency aid for overdoses 3Plant communities produce greater yield than monocultures 2Plant communities produce greater yield than monocultures 3
... of amphibians drastically decreases in forest areas that are ... researcher, however, has found that some animals may not ... may be moving away (possibly to return later) or ... both the timber industry and the survival of amphibians. ...
... changes to a gene that do not alter ... bipolar disorder. This is the first epigenome-wide investigation ... be a significant step on the journey to ... senior scientist in the Krembil Family Epigenetic Laboratory ...
... March 10 BIO-key International,Inc. (OTC Bulletin Board: BKYI) today ... results on Monday, March 17, 2008,after the market close. In ... will be broadcast live over the Internet,on Tuesday, March 18, ... BIO-key International, Inc. Fourth Quarter and Full Year 2007 ...
Cached Biology News:Amphibians respond behaviorally to impact of clear cutting 2Epigenetic changes discovered in major psychosis 2BIO-key(R) Announces Fourth Quarter and Full Year 2007 Earnings Release and Conference Call Schedule 2
(Date:10/20/2014)... , A major pan-European survey into the ... care has revealed changing trends in many important GI ... of healthcare services across the continent. The results of ... (UEG), have been announced today and led to calls ... of GI disorders across Europe ...
(Date:10/20/2014)... 2014 Earle Martin , ... today that Ellen Teplitzky, an experienced attorney specializing ... pharmaceutical industry, has joined the firm as Director ... services practice. NDA Partners provides legal services, ... testimony, to top law firms and their clients ...
(Date:10/19/2014)... Oct. 19, 2014 NextCODE Health, which enables clinicians ... in real time, today announced the launch of its new ... , at the American Society of Human Genetics (ASHG) annual ... more, sign up and apply for free beta access, visit ... and benefits can be viewed here . ...
(Date:10/19/2014)... 19, 2014 The report "Chocolate, Cocoa ... Trade, Prices, Geography Trend and Forecast (2011 - 2016)," ... and geography and studies the major market drivers, restraints, ... Europe, and Asia. , The global chocolate market is ... billion in 2016 at an estimated CAGR of 2.7% ...
Breaking Biology Technology:Major Survey Reveals Changing Trends and Inequalities in Healthcare Provision for Gastrointestinal Disorders Across Europe 2Major Survey Reveals Changing Trends and Inequalities in Healthcare Provision for Gastrointestinal Disorders Across Europe 3Major Survey Reveals Changing Trends and Inequalities in Healthcare Provision for Gastrointestinal Disorders Across Europe 4Major Survey Reveals Changing Trends and Inequalities in Healthcare Provision for Gastrointestinal Disorders Across Europe 5NDA Partners Appoints Ellen Teplitzky, JD as Director of its Legal Services Practice 2The 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 3Chocolate Market Projected To Reach $98.3 Billion by 2016 - New Report by MarketsandMarkets 2Chocolate Market Projected To Reach $98.3 Billion by 2016 - New Report by MarketsandMarkets 3Chocolate Market Projected To Reach $98.3 Billion by 2016 - New Report by MarketsandMarkets 4
... Jie Lian, assistant professor in the Department of Mechanical, ... won a prestigious Faculty Early Career Development Award (CAREER) ... use the five-year, $500,000 award to further his research ... energy systems. The CAREER Award is given to faculty ...
... April 3, 2012  inVentiv Health, Inc., offering best-in-class ... industry, announced that it has completed the acquisition ... of functional outsourcing solutions to pharmaceutical, biotech and ... million in cash. The transaction closed on March ...
... April 3, 2012 Health Diagnostic Laboratory, Inc. (HDL, ... hiring of Scott Blackwell. Recently named Vice President of ... and values of an advanced laboratory that is growing ... http://photos.prnewswire.com/prnh/20120403/PH81634 )  "Scott comes to ...
Cached Biology Technology:Rensselaer professor Jie Lian receives NSF CAREER Award 2inVentiv Health Completes Acquisition of Kforce Clinical Research 2inVentiv Health Completes Acquisition of Kforce Clinical Research 3inVentiv Health Completes Acquisition of Kforce Clinical Research 4Health Diagnostic Laboratory Names Scott Blackwell Vice President of Corporate Culture 2
... designed for sequencing inserts cloned into M13/pUC-based ... T3 RNA polymerase promoters, or lambda gt10 ... a concentration of 0.1 µg/µl in water. ... sequencing reactions using SequiTherm™ EXCEL™ II DNA ...
... Expression is a powerful application for ... a novel interface, Expression makes complex ... simple. Expression uses the very latest ... in the way sequences are analysed. ...
... Compatible with AutoGen AutoGenesys, BioRobotics BioPick, BioGrid, ... colony picking systems This CLS number is ... match Cornings product number. If showing no ... Sigma-Aldrich number (D9314) or contact customer service ...
... number is a new product number, ... number. If showing no availability yet, ... number (C6671) or contact customer service ... Surface area 148 cm 2 ...
Biology Products: