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:8/21/2014)... they are the ultimate source of all organic matter ... on algae, too, to suck up climate-warming carbon dioxide ... of the ocean. Now, by using a combination of ... that viruses infecting those algae are driving the life-and-death ... stays essentially the same, and this has important implications ...
(Date:8/21/2014)... In a finding that has implications for life in ... in the solar system, LSU Associate Professor of Biological ... National Science Foundation, or NSF, this week published a ... lake that lies 800 meters (2600 feet) beneath the ... microbial ecosystems.", Given that more than 400 subglacial lakes ...
(Date:8/21/2014)... connectors, designed by an international standards process, will be ... to an invited review published in the OnlineFirst version ... ), the official journal of the American Society for ... greatly reduce the occurrence of misconnection that can be ... which are used to join medical devices, components, and ...
Breaking Biology News(10 mins):Viruses take down massive algal blooms, with big implications for climate 2800 meters beneath Antarctic ice sheet, subglacial lake holds viable microbial ecosystems 2800 meters beneath Antarctic ice sheet, subglacial lake holds viable microbial ecosystems 3800 meters beneath Antarctic ice sheet, subglacial lake holds viable microbial ecosystems 4New feeding tube connectors will improve patient safety 2
... NARRAGANSETT, R.I. August 30, 2010 ... at the University of Rhode Island Graduate School ... Science Foundation (NSF) RAPID Response grant through the ... $199,909 NSF grant, Improving Communication of Oil Spill ...
... Undergrads often take communication courses unrelated to their major ... teamed up with the Library and English Departments to ... and understand literature searchers and incorporate them into papers ... and Gail R. Nonnecke, Iowa State University faculty from ...
... diseases are hereditary. But despite significant progress in genome ... The discovery of the underlying genetic defect is, however, ... of innovative approaches to their treatment. Scientists at the ... of Medical Genetics at the Charit Universittsmedizin - Berlin ...
Cached Biology News:Metcalf Institute wins NSF grant to help journalism and communication of oil spill research 2Teaching communication and information literacy skills 2All genes in 1 go 2
(Date:8/22/2014)... Aug. 22, 2014 Research and Markets ... Molecular Biology Enzymes, Kits, & Reagents (Cloning, Epigenetics, PCR, ... report to their offering. The global ... in 2013, and is expected to grow at a ... Molecular biology enzymes, kits, & reagents find applications in ...
(Date:8/22/2014)... 2014 Nerium International, the go-to, ... the spotlight again. Nerium will showcase its signature ... Body Contouring Cream to Hollywood’s elite at the ... the 66th Primetime Emmy® Awards. , Developed from ... clinical trials show that NeriumAD night cream dramatically ...
(Date:8/22/2014)... “Our nation's healthcare system is ... disgrace. Furthermore, every governmental and professional entity that ... state of unorganized dysfunction shares in that enormous ... serve as a device to use in an ... that have accumulated through the years leading to ...
(Date:8/21/2014)... 2014 DNA vaccine pioneer Immunomic ... development of JRC-LAMP-vax, an innovative and safe potential treatment ... studies began this month in Hawaii, moving the world ... The Japanese red cedar releases pollen that causes devastating ... Cedar pollen wreaks similar havoc in Colorado, New Mexico ...
Breaking Biology Technology:Global Molecular Biology Enzymes, Kits, & Reagents (Cloning, Epigenetics, PCR, Restriction Digestion, Sequencing) Market - Forecast to 2018 2Global Molecular Biology Enzymes, Kits, & Reagents (Cloning, Epigenetics, PCR, Restriction Digestion, Sequencing) Market - Forecast to 2018 3Nerium International Joins Television’s Biggest Stars at Backstage Creations Giving Suite at the 66th Primetime Emmy Awards 2Nerium International Joins Television’s Biggest Stars at Backstage Creations Giving Suite at the 66th Primetime Emmy Awards 35 Great Mistakes in Healthcare and How to Fix Them by Dr. Ira Williams 2Relief for Allergy Sufferers Finally in Sight: Immunomic Therapeutics Closes in on Treatment for Hay Fever in Japan, U.S. 2Relief for Allergy Sufferers Finally in Sight: Immunomic Therapeutics Closes in on Treatment for Hay Fever in Japan, U.S. 3Relief for Allergy Sufferers Finally in Sight: Immunomic Therapeutics Closes in on Treatment for Hay Fever in Japan, U.S. 4
... , , , ... SHP, Nasdaq: SHPGY ), the global specialty biopharmaceutical ... care of adults with Attention-Deficit/Hyperactivity Disorder (ADHD), a psychiatric behavioral ... country.* The first initiative, "RoADHD Trip," a multi-city self ...
... Aug. 17 /PRNewswire-FirstCall/ - Vasogen Inc. (NASDAQ: VSGN ... letter from the Listing Qualifications Department of The NASDAQ ... with Listing Rule 5550(a)(2). , We plan to request ... Panel") to review the NASDAQ,s determination of the continued ...
... Zentaris Inc. (NASDAQ: AEZS ; TSX: AEZ) ... therapy and oncology, today reported Phase 3 results for ... trial Z-041 in benign prostatic hyperplasia (BPH), with its ... on March 6, 2009, sanofi-aventis U.S. LLC entered into ...
Cached Biology Technology:Shire Initiates Two Adult ADHD Outreach Programs 2Shire Initiates Two Adult ADHD Outreach Programs 3Shire Initiates Two Adult ADHD Outreach Programs 4Vasogen Receives NASDAQ Notification Related to Minimum Bid Price 2AEterna Zentaris Announces Results from Two Phase 3 Studies with Cetrorelix in Benign Prostatic Hyperplasia 2AEterna Zentaris Announces Results from Two Phase 3 Studies with Cetrorelix in Benign Prostatic Hyperplasia 3AEterna Zentaris Announces Results from Two Phase 3 Studies with Cetrorelix in Benign Prostatic Hyperplasia 4AEterna Zentaris Announces Results from Two Phase 3 Studies with Cetrorelix in Benign Prostatic Hyperplasia 5AEterna Zentaris Announces Results from Two Phase 3 Studies with Cetrorelix in Benign Prostatic Hyperplasia 6AEterna Zentaris Announces Results from Two Phase 3 Studies with Cetrorelix in Benign Prostatic Hyperplasia 7
... The SlowFade Light Antifade Kit is ... photobleaching seen with fluorescent dyes. This formulation ... fluorescein AMCA and Cascade Blue fluorophores that ... (S-2828). This kit is available with the ...
Human Xg Affinity Purified Polyclonal Ab Keywords: Xg glycoprotein, hereditary hemorrhagic telangiectasia Protein Family: ...
in vitro Translation, Accessory Products...
...
Biology Products: