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:12/3/2014)... , Dec. 2, 2014 As part of ... Inception Technologies is pleased to announce the release of ... customers to collect the workforce data that they need. ... have been left by existing readers. Many such devices ... connectivity and modern technology. Older models force users to ...
(Date:11/21/2014)... Wash. , Nov. 20, 2014 C-Labs ... for the Internet of Things (IoT), today announced the ... of chief operating officer. Previously a strategic advisor to ... finance, and operations. Mr. Traynor is based out of ... . He reports to Chris Muench , Chief ...
(Date:11/18/2014)... The Parenteral Drug Association (PDA) today confirmed that seven officials ... least seven more will participate in the upcoming 2014 PDA ... Washington D.C. , Dec. 2-4. ... the regulatory agencies in the United States ... to help advance the use of metrics in the regulatory ...
Breaking Biology News(10 mins):Inception Technologies to Release New Biometric Reader 2C-Labs Names Former Microsoft and Bsquare Executive as Chief Operating Officer 2FDA's Janet Woodcock, EMA's Emer Cooke Headline PDA Quality Metrics Conference 2
... an estimated 665,000 deaths, mostly among African children. Now, ... for the world,s most useful antimalarial drug, artemisinin, giving ... cost of the live-saving drug in the future. , ... been slow due to high production costs of artemisinin. ...
... a hormone released by the lining of the stomach that ... obesity -- in fact, a vaccine that lowers ghrelin levels ... treatment for obesity. However, many people eat as a ... its effectiveness as a treatment for obesity may be reduced. ...
... pose considerable health threats to humans, and the heavy metal ... are exposed to it through plant-derived foods such as grains ... can reduce the amount of Cd found in the food ... in the Cell Press journal Trends in Plant Science ...
Cached Biology News:IU chemist develops new synthesis of most useful, yet expensive, antimalarial drug 2Low ghrelin -- reducing appetite at the cost of increased stress? 2Studies shed light on how to reduce the amount of toxins in plant-derived foods 2
(Date:12/17/2014)... BASKING RIDGE, N.J. (PRWEB) December 17, 2014 ... Ipsen (Euronext: IPN; ADR: IPSEY), ... 120 mg (referred to as Somatuline®) was approved ... for the treatment of gastroenteropancreatic neuroendocrine tumors (GEP-NETs) ... differentiated, locally advanced or metastatic disease to improve ...
(Date:12/17/2014)... 2014 Audacity, a leading California-based health ... of the Huntsworth Health Group, is proud to announce ... In her role, Gonzales will serve as Senior Vice ... honored to welcome a talent of Jamie’s caliber to ... Fraikin. “She is a proven healthcare innovation leader and ...
(Date:12/17/2014)...   Synageva BioPharma Corp. (NASDAQ: ... rare disorders, announced today its presentation at the upcoming ... San Francisco, CA. Sanj ... present on Monday, January 12, 2015, at 9:00 a.m. ... live and may be accessed from the "Webcasts & ...
(Date:12/15/2014)... Limited (NASDAQ GS: SEED) (" Origin ", or the " ... China , today announced that the Company will ... 2014, before the market opens on Thursday, January 8, 2015. ... 8, 2015, at 8:00 a.m. ET / 9:00 p.m. ... participate in the call, please dial +1-888-346-8982 in ...
Breaking Biology Technology:Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 2Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 3Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 4Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 5Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 6Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 7Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 8Audacity Welcomes Healthcare Communications Expert Jamie Gonzales as Senior Vice President of Client Services 2Origin Agritech Limited to Announce Fiscal 2014 Annual Financial Results on January 8th, 2015 2Origin Agritech Limited to Announce Fiscal 2014 Annual Financial Results on January 8th, 2015 3
... 22 /PRNewswire/ - Do winery tasting rooms really help ... Vineland Research and Innovation Centre almost half of winery ... months of their visit. , "This research proves that ... the brand resulting in future sales," said Dr. Isabelle ...
... /PRNewswire-FirstCall/ - AEterna Zentaris Inc. (TSX: AEZ; Nasdaq: ... focused on endocrine therapy and oncology, today presented ... orally-active tubulin and topoisomerase II inhibitor compound, AEZS-112, ... which may potentially provide a new therapeutic approach ...
... 500 Corporations, Universities, and Young Companies will Present at ... Mass., April 22 NSTI and CTSI today announced ... & development, funding, and commercialization partners will be showcased ... 4-6, 2009 at the George R. Brown Convention Center ...
Cached Biology Technology:Setting the Benchmark for Winery Tasting Room Research: An Emerging Region Gets a Global Perspective 2AEterna Zentaris Presents Phase 1 Results for AEZS-112 in Patients with Advanced Cancer and Lymphoma at AACR Annual Meeting in Denver 2AEterna Zentaris Presents Phase 1 Results for AEZS-112 in Patients with Advanced Cancer and Lymphoma at AACR Annual Meeting in Denver 3TechConnect Summit Brings the Global Technology Community to Houston, May 4-6, 2009 2TechConnect Summit Brings the Global Technology Community to Houston, May 4-6, 2009 3TechConnect Summit Brings the Global Technology Community to Houston, May 4-6, 2009 4
... Rabbit polyclonal to ThPok ( Abpromise for ... Synthetic peptide conjugated to KLH derived from within ... (Note: the amino acid sequence is proprietary) ... .) Entrez Gene ID: ...
Goat polyclonal to Ephrin B2 ( Abpromise for all tested applications). entrezGeneID: 1948 SwissProtID: P52799...
Pronase Reagent...
Mouse monoclonal [7E10] to C Peptide ( Abpromise for all tested applications). entrezGeneID: 3630 SwissProtID: P01308...
Biology Products: