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:4/17/2014)... Our eyes not ... with a continuous stream of information about our own movements. ... a car the world glides by us and leaves ... our brain calculates self-motion from this "optic flow". This way, ... during our own movements. Together with biologists from the University ...
(Date:4/17/2014)... hydrogen sulfide in order to properly multiply and form ... Center for Craniofacial Molecular Biology at the Herman Ostrow ... principal investigator on the project, said the presence of ... of calcium ions. The essential ions activate a chain ... creation of new bone tissue, and keeps the breakdown ...
(Date:4/17/2014)... Rajendra Singh Thursday as a "Champion of Change" ... deployment in the residential, commercial and industrial sectors. ... Electrical and Computer Engineering and director of Clemson,s ... hero leading the charge across the country to ... and driving policy changes at the local level ...
Breaking Biology News(10 mins):How vision makes sure that little fish do not get carried away 2How vision makes sure that little fish do not get carried away 3How vision makes sure that little fish do not get carried away 4White House honors Clemson professor as 'Champion of Change' for solar deployment 2
... not the most hospitable place on Earth, but at least ... The bacteria -- Chryseobacterium and Paenisporosarcina ... the laboratory that was designed to simulate as closely as ... of Arctic and Antarctic glaciers, said Corien Bakermans, assistant professor ...
... in which a key cell of the immune system prepares ... processes that take place within these cells and could lead ... cancer. The research focused on the neutrophil, the most ... the immune system, its job is to seek out and ...
... canines were on a mission to sniff out trouble ... of an Office of Naval Research (ONR)-hosted "Top Dog ... by helping them move through the battle space," said ... Program, part of ONR,s Expeditionary Warfare and Combating Terrorism ...
Cached Biology News:Hardy bacteria help make case for life in the extreme 2UCSF team uncovers how immune cells move against invaders 2Marine's best friend shows explosive-detecting capabilities 2
(Date:1/15/2014)... England , January 15, 2014 A ... win races on the Formula 1 track could help to ... McLaren Applied Technologies (MAT), Stowhealth (a GP surgery based in ... by healthcare provider Simplyhealth. Telemetry technology, which is ...
(Date:1/15/2014)... NY (PRWEB) January 15, 2014 The Microcompetition ... a major disease. One of these latent viruses is the ... rheumatoid arthritis (RA). Rheumatoid arthritis (RA) is a chronic inflammatory ... theory, a study found that RA patients have high concentrations ...
(Date:1/15/2014)... CA (PRWEB) January 15, 2014 ... research solutions, today announced that Lupin Limited, one of ... Freeslate’s CM Protégé PharmD System for high ... Mumbai, India, is focused on a wide range of ...
(Date:1/14/2014)... Date: Friday, April 11, 2014 , Time: ... 1360 Almshouse Road, Warrington, Pa. , Details: The ... to finding a cure for hepatitis B and improving the ... annual Crystal Ball on Friday, April 11 at Warrington Country ...
Breaking Biology Technology:Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 2Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 3Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 4Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 2Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 3Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 3Hepatitis B Foundation to Host Annual Crystal Ball Gala 2
... tickles your feet or the red Bordeaux smacking on your ... special chemical markers. These markers, called isotopes, can tell scientists ... they traveled, and what happened to them along the way. ... Stanford chemists have developed a new method to make isotopic ...
... PROMOTIONAL SYSTEMS, INC. (Pink Sheets: VGPR) today announced it has ... to assist the Company in building a biomass production facility ... its intention to build a biomass plant in Georgia to ... State,s Bioenergy Corridor. Georgia ranks third in the nation ...
... Inc. (Nasdaq: NVAX ) announced today its ... vaccine technology to ROVI Pharmaceuticals (Madrid: ROVI) of Spain. ... a comprehensive influenza vaccine solution for the Spanish government ... by the Spanish Ministry of Health and other government ...
Cached Biology Technology:Stanford researchers find a quicker, cheaper way to sort isotopes 2Stanford researchers find a quicker, cheaper way to sort isotopes 3Vega Picks Tennessee Firm to Assist with Construction of Biomass Plant in Georgia 2Spanish Government Selects Novavax's VLP Technology for Comprehensive Flu Vaccine Solution in Spain 2Spanish Government Selects Novavax's VLP Technology for Comprehensive Flu Vaccine Solution in Spain 3Spanish Government Selects Novavax's VLP Technology for Comprehensive Flu Vaccine Solution in Spain 4Spanish Government Selects Novavax's VLP Technology for Comprehensive Flu Vaccine Solution in Spain 5
CircuLex Anti-Human S100P Polyclonal Antibody Research Focus: proliferation Storage: -20C Shipping Temperature: 4C...
...
Raised to arginine vasopressin coupled to bovine thyroglobulin with carbodiimide ....
Anti-LC3 Polyclonal Antibody Research Focus: cell surface antigens Storage: -20C Shipping Temperature: +4C...
Biology Products: