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:3/24/2015)... DUBLIN , Mar. 24, 2015 Research and Markets ... "Face and Voice Biometrics - Global Strategic Business Report" report ... for Face and Voice Biometrics in US$ Thousands by the following ... analytics for the US, Canada , ... , Middle East & ...
(Date:3/23/2015)... 23, 2015   HOYOS Labs , a leading ... announced that the Company will demonstrate multiple biometrics-based technologies ... consumers at Connect:ID on March 23 through 25, 2015, ... will highlight the IEEE Biometric Open Protocol Standard; free ... enterprise access control system. BOPS was invented by HOYOS ...
(Date:3/20/2015)... Research and Markets ( http://www.researchandmarkets.com/research/rswjb4/hand_geometry ) has ... Strategic Business Report" report to their offering. ... US$ Thousands. The report provides separate comprehensive analytics for the ... , Europe , Asia-Pacific ... World. Annual estimates and forecasts are provided for ...
Breaking Biology News(10 mins):Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 2Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 3Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 4Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 5Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 6HOYOS Labs to Showcase Host of Biometrics Technologies at Connect:ID in Washington, D.C. 2HOYOS Labs to Showcase Host of Biometrics Technologies at Connect:ID in Washington, D.C. 3Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 2Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 3Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 4
... important fungus, causing potentially life-threatening infections in patients with ... of respiratory allergy, and it is implicated in asthma ... lack the ability to reproduce sexually, but new discoveries ... fungus has a number of characteristics of sex. The ...
... Genome Research Institute (NHGRI), one of the National Institutes ... Research Network will target 13 more organisms as part ... will expand biological knowledge and improve human health. , ... which is a federally chartered committee that advises NHGRI ...
... Insects are known to lack an antibody-mediated immune ... that, instead, they produce protective proteins in response ... and antibacterial effectors produced at a first infection ... These results raise important issues in insect research ...
Cached Biology News:Secret sex life of killer fungus? 2NHGRI Selects 13 More Organisms for Genome Sequencing 2NHGRI Selects 13 More Organisms for Genome Sequencing 3NHGRI Selects 13 More Organisms for Genome Sequencing 4NHGRI Selects 13 More Organisms for Genome Sequencing 5The very defensive caterpillar 2
(Date:3/25/2015)... Mass. and REYKJAVIK, Iceland , ... capabilities for using the genome to create better medicine, today ... the largest studies of whole-genome data yet undertaken. ... Nature Genetics – are built around the most ... a team of deCODE scientists led by Kari Stefansson ...
(Date:3/25/2015)... Researchers at Ancon Medical Inc. have ... enable broader and less invasive screening for cancer, ... breath screen. The Minnesota-based medical device maker will ... Administration (FDA) approval process and is targeting a ... Tagging device. , Ancon Medicals nanoparticle breakthrough comes ...
(Date:3/25/2015)... March 25, 2015 FDNA®, the ... 4 of Face2Gene, allowing geneticists around the ... as well as mobile devices. Face2Gene® facilitates detection of ... to present comprehensive and up-to-date genetic references. The date ... Meeting, ACMG 2015, in Salt Lake City, ...
(Date:3/25/2015)... The global Smart Weapons Market can ... technology, platform, and geography. The various technologies ... infra-red, microwave, global positioning systems, and other ... systems, and inertial navigation systems. , Browse ... spread through 172 Pages and in-depth TOC ...
Breaking Biology Technology:Landmark deCODE Studies Demonstrate the Power of Truly Big Genomics for Improving Medicine Worldwide 2Ancon Medical Researchers Make Nanotechnology Breakthrough for Disease Screening Technology 2Ancon Medical Researchers Make Nanotechnology Breakthrough for Disease Screening Technology 3FDNA Releases a Multi-Platform Version of Face2Gene, a Genetic Search and Reference Solution at ACMG 2015 2Smart Weapons Market is Estimate to reach $6.1 Billion by 2020 Worth $6.1 Billion by 2020 - New Report by MarketsandMarkets 2Smart Weapons Market is Estimate to reach $6.1 Billion by 2020 Worth $6.1 Billion by 2020 - New Report by MarketsandMarkets 3
... June 22 /PRNewswire-Asia/ -- WuXi PharmaTech (Cayman) Inc.,(NYSE: ... development outsourcing company with operations in China and the,United States, ... of WuXi AppTec U.S. , (Logo: ... Prior to joining WuXi, Mr. Hsu worked at Medtronic for ...
... SHANGHAI, June 21 /PRNewswire-Asia/ -- WuXi PharmaTech ... biotechnology, and medical device research and,development outsourcing company with ... Wei-Min Chang has been appointed Vice President of,Operations and ... in the Jinshan chemical industry zone of Shanghai. Mr. ...
... announced on June 16, 2009, that the Company and ... filed a voluntary petition for reorganization under chapter 11 ... States Bankruptcy Court for the District of Delaware in ... continue to manage and operate their business as debtors ...
Cached Biology Technology:WuXi PharmaTech Appoints Felix Hsu as Senior Vice President of U.S. Operations 2WuXi PharmaTech Appoints Wei-Min Chang as Vice President of Operations and General Manager of SynTheAll Manufacturing Facility, Eric Gu as Vice President of Business Development for Manufacturing Services 2Isolagen, Inc. Announces Receipt of Interim Order from Bankruptcy Court Approving DIP Motion 2Isolagen, Inc. Announces Receipt of Interim Order from Bankruptcy Court Approving DIP Motion 3
ANTI ALPHA FSH:B...
... is collected from fasted mixed breed, mixed sex ... Anticoagulants: N-02: Citrate N-04: ... N-08: Potassium Oxalate N-10: EDTA ... ACD N-07: CPD N-09: ...
MOUSE ANTI BOVINE TROPONIN I...
NORMAL DONOR DONKEY SERUM...
Biology Products: