Navigation Links
1-finger exercise reveals unexpected limits to dexterity
Date:7/7/2009

"Push your finger as hard as you can against the surface. Now as hard as you can but move it slowly - follow the ticking clock. Now faster. Now faster."

These were the commands for volunteers in a simple experiment that casts doubt on old ideas about mechanisms to control hand muscles. Complete understanding of the result may help explain why manual dexterity is so vulnerable to aging and disease, and even help design more versatile robotic graspers.

A research team led by Francisco Valero-Cuevas of the University of Southern California reports the paradoxical result in the Journal of Neuroscience.

"We expected to find," says the report, "that maximal voluntary downward force would scale with movement speed. Surprisingly, maximal force was independent of movement speed."

The observation challenges theories that date back nearly seventy years about how the properties of muscles influence their everyday function, and how "redundant" our bodies are.

According to Valero-Cuevas, who holds a joint appointment in the USC Viterbi School of Engineering's department of biomedical engineering and the USC Division of Biokinesiology and Physical Therapy, in many tasks muscle force is affected by physiological "force-velocity" properties that weaken muscles as they move faster.

"That is why your bicycle has gears, and why as a child you could not speed up much on level ground," he explains.

Valero-Cuevas and his collaborators set up a simple experiment to characterize how finger velocity made a difference in the force produced during the common manipulation task similar to rubbing a surface, using a computer track pad or iphone. Adult volunteers wearing a closefitting Teflon cover on their forefingers applied fingertip pressure on a slippery Teflon surface linked to a force-measuring sensor.

First, the volunteers simply pressed as hard as they could without moving. Then, still pressing as hard as
'/>"/>

Contact: Eric Mankin
mankin@usc.edu
213-821-1887
University of Southern California
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Obesity and lack of exercise could enhance the risk of pancreatic cancer
2. Exercise improves thinking, reduces diabetes risk in overweight children
3. Canadian Society of Exercise Physiology Annual Scientific Conference
4. Newly-identified exercise gene could help with depression
5. Built-in exercise monitor predicts fitness
6. Eat less or exercise more? Either way leads to more youthful hearts
7. Community-intervention study links successful town makeover focused on boosting calcium and exercise
8. Where college students live can impact their weight, eating and exercise habits
9. Exercise during pregnancy leads to a healthier heart in moms- and babies-to-be
10. Mass. General study shows how exercise changes structure and function of heart
11. Brief, intense exercise benefits the heart
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
1-finger exercise reveals unexpected limits to dexterity
(Date:4/2/2015)... , April 2, 2015 At its ... Salt Lake City , the American College of ... five new directors to its Board.  Members of the ... ACMG and for forming and advancing its policies and ... genetics profession. "It,s an eventful time in ...
(Date:4/1/2015)... 2015  NXT-ID, Inc. (NASDAQ: NXTD ) ("NXT-ID" ... the growing mobile commerce market, announces the second shipment ... underway to early access pre-order customers. ... retail outlets including Walmart, Target, AT&T, Dunkin, Donuts, Stop ... accepted at all outlets and very easy to use. ...
(Date:3/31/2015)... March 31, 2015   Guidepoint , a leading ... the Post-Surgical Pain Management TRACKER, part of the ... trends in the medical device and therapeutics markets. The ... including treatment volumes, market share, and adoption rates across ... with joint surgery. The Post-Surgical Pain Management ...
Breaking Biology News(10 mins):American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 2American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 3American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 4American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 5American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 6American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 7American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 8NXT-ID Reports Second Shipment of Wocket Smart Wallets Underway to Early Access Pre-order Customers and Provides User Feedback 2NXT-ID Reports Second Shipment of Wocket Smart Wallets Underway to Early Access Pre-order Customers and Provides User Feedback 3NXT-ID Reports Second Shipment of Wocket Smart Wallets Underway to Early Access Pre-order Customers and Provides User Feedback 4Guidepoint Launches Post-Surgical Pain Management TRACKER 2Guidepoint Launches Post-Surgical Pain Management TRACKER 3
... development, it can regenerate itself to such an extent ... of the heart cells remain healthy. Dr. Jrg-Detlef Drenckhahn ... Berlin-Buch made this discovery together with colleagues from Australia. ... the healthy cells of the heart divide more frequently ...
... on other planets and in extreme environments on Earth ... initiative under a five-year grant from NASA,s Astrobiology Institute ... Christopher H. House, associate professor of geosciences, will lead ... characterize life, look for biological signatures in relevant ecosystems ...
... stick to surfaces and walk up walls has inspired many ... a gecko,s foot. The secret behind the gecko,s ability to ... micro-/nano-scale on the underside of the gecko,s foot. Because there ... tightly to the surface the gecko is walking on by ...
Cached Biology News:Repair in the developing heart 2Penn State receives new NASA astrobiology grant 2Penn State receives new NASA astrobiology grant 3
(Date:4/24/2015)... 24, 2015  Navitas Life Sciences is delighted to announce ... Clinical and Regulatory Services. Shalabh is a proven leader in ... CEO of Kinapse, as well as a Strategy consultant at ... - http://photos.prnewswire.com/prnh/20150423/201261LOGO ... "I am delighted to welcome Shalabh into this critical role ...
(Date:4/23/2015)... 2015 Athena San Diego, an organization ... women in San Diego’s technology and life science sectors, ... Awards at their Gala on April 30, 2015 from ... at http://athenasd.org/events/ , The Pinnacle Awards recognize ... Diego vision of fostering networking, risk taking and diversity ...
(Date:4/23/2015)... Washington, D.C. (PRWEB) April 23, 2015 ... Washington, D.C. region on April 4-17 as part ... visit marks the fourth group of biotechnology startups ... University of Nizhny Novgorod (UNN) and the University ... to deepen ties between their respective universities in ...
(Date:4/23/2015)... 2015  Cryoport, Inc. (OTCBB: CYRX) ("Company"), the ... the life sciences industry, today announced that the ... within the animal husbandry market by signing a ... the shipment of equine semen for artificial insemination ... Animal husbandry is a multi-billion dollar ...
Breaking Biology Technology:Shalabh Kumar Joins Navitas Life Sciences to Lead their Clinical and Regulatory Services Teams 2Athena Pinnacle Awards to Honor Executives, Corporations and Educators Working to Promote Women Leaders 2U.S.-Russian Innovation Corridor Program Connects Visiting Russian Startups to U.S. Experts 2U.S.-Russian Innovation Corridor Program Connects Visiting Russian Startups to U.S. Experts 3U.S.-Russian Innovation Corridor Program Connects Visiting Russian Startups to U.S. Experts 4Cryoport to Support the Equine Animal Husbandry Market Through Agreement with Yancey Farms 2Cryoport to Support the Equine Animal Husbandry Market Through Agreement with Yancey Farms 3
... Call Scheduled for October 31, 2008 at 11:00 am ... plc,(Nasdaq: TRIB ), a leading developer and manufacturer ... will report,financial results for the third quarter of fiscal ... scheduled a conference call for that same,day, Friday, October ...
... Oct. 23 WaferGen Biosystems,Inc. (OTC Bulletin Board: ... cell biology and stem cell research systems,today announced ... will deliver a corporate presentation at the Seventh,Annual ... October 28-31, 2008,at the Palace Hotel in San ...
... SuperGen, Inc.,(Nasdaq: SUPG ), a ... of novel cancer therapies, today presented data ... additional posters, at the 20th,EORTC-NCI-AACR Symposium on ... MP-470, an orally bio-available multi-targeted,tyrosine kinase inhibitor, ...
Cached Biology Technology:Trinity Biotech plc to Announce Third Quarter 2008 Financial Results on October 31, 2008 2WaferGen to Present at the Seventh Annual BIO Investor Forum 2SuperGen's MP-470 Demonstrates Clinical Tumor Regression When Combined with Standard of Care Chemotherapy 2SuperGen's MP-470 Demonstrates Clinical Tumor Regression When Combined with Standard of Care Chemotherapy 3SuperGen's MP-470 Demonstrates Clinical Tumor Regression When Combined with Standard of Care Chemotherapy 4
...
... APAgene kits are designed to rapidly ... using our patented APA Technology. ... at an extraordinarily competitive price. All ... kit. The Locator Kit can be ...
Protein YIPF6 (YIP1 family member 6). [Source:Uniprot/SWISSPROT;Acc:Q96EC8] Antigen: Recombinant Protein Epitope Signature Tag (PrEST)....
... to deparaffinize and perform Heat Induced Antigen ... sections mounted on glass microscope slides. Deparffinization ... the high temperature used in HIER (over ... paraffin by detergent. Formaldehyde fixation impairs or ...
Biology Products: