Navigation Links
Grouping muscles to make controlling limbs easier
Date:4/20/2009

With more than 30 muscles in your arm, controlling movement -- whether it's grasping a glass or throwing a baseball -- is a complex task that potentially takes into account thousands of variables.

But researchers at Northwestern University have shown that it could be possible to control a limb by stimulating groups of muscles rather than individual muscles -- a finding that could make it easier to restore muscle movements in people who have become paralyzed.

The researchers used a model of the muscles in a frog's hind leg to perform a computational analysis that, when run as a simulation, shows that researchers can control the limb using muscle groups just about as well as if they controlled individual muscles. The findings were published last week by the Proceedings of the National Academy of Sciences.

"By controlling muscle groups instead of individual muscles, we're reducing the variables, but we're not losing efficiency," said Matthew Tresch, assistant professor of biomedical engineering at the McCormick School of Engineering and Applied Science and of physical medicine and rehabilitation at the Feinberg School of Medicine. Tresch and colleagues from the Rehabilitation Institute of Chicago conducted the research.

The idea that the body's nervous system controls a limb using muscle groups, or "synergies," has been a controversial hypothesis in the research community for the last decade. If this were the case, it would reduce the number of variables that the nervous system needs to control.

"We still don't know if that's how the central nervous system works, but what has been missing from the rhetoric is the question of whether this is a viable way to produce behavior," said Tresch. "That's what our experiment tried to do."

Using both analytical approaches and techniques from control theory, the researchers chose the muscle combinations that let the frog's hind leg do what it wants to do most effectively. The simulation showed that by choosing the most effective balance of muscle synergies, the researchers could control movement without degrading performance.

"Having all these muscle variables complicates control of behavior, but it also makes certain behavior easier," said Tresch. "The complexity might be there to make certain kinds of movements more efficient than others."

By having this framework, researchers might be able to predict how muscle activation changes when a person loses a muscle or becomes paralyzed.

"Whether or not the nervous system uses this, it does seem like an approach that can simplify control for a complicated mechanical system, like a limb," said Tresch. "For people with spinal cord injuries, you can put electrodes into their muscles and stimulate them. We can use this synergies approach to make controlling a limb simpler."

Next Tresch will perform similar research using a rat model, and he is currently working with other professors at Northwestern to bring the research to patients.

"The end goal is to restore movement in people who are paralyzed," he said.


'/>"/>

Contact: Megan Fellman
fellman@northwestern.edu
847-491-3115
Northwestern University
Source:Eurekalert

Related biology news :

1. Genome of saltwater creature could aid understanding of gene grouping
2. As good as it gets: Octogenarian muscles dont get stronger with exercise
3. Motor nerve targeting to limb muscles is controlled by ephrin proteins
4. Post-exercise caffeine helps muscles refuel
5. Stem-cell transplantation improves muscles in MD animal model, UT Southwestern researchers report
6. How molecular muscles help cells divide
7. Probing and controlling molecular rattling may mean better preservatives
8. Controlling cucumber beetles organically
9. Brain enzyme may play key role in controlling appetite and weight gain
10. bioMETRX, Inc. Signs Deal To Acquire Controlling Interest in Biometric Solutions, LLC
11. Hidden infections crucial to understanding, controlling disease outbreaks
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/12/2016)... 12, 2016 WearablesResearch.com , a brand ... overview results from the Q1 wave of its quarterly ... was consumers, receptivity to a program where they would ... health insurance company. "We were surprised to ... Michael LaColla , CEO of Troubadour Research, "primarily ...
(Date:4/28/2016)... and BANGALORE, India , April 28, 2016 ... a product subsidiary of Infosys (NYSE: INFY ), ... a global partnership that will provide end customers ... mobile banking and payment services.      (Logo: ... innovation area for financial services, but it also plays a ...
(Date:4/26/2016)... April 27, 2016 Research ... Multi-modal Biometrics Market 2016-2020"  report to their offering.  ... The analysts forecast the global multimodal ... 15.49% during the period 2016-2020.  Multimodal ... sectors such as the healthcare, BFSI, transportation, automotive, ...
Breaking Biology News(10 mins):
(Date:5/24/2016)... ... May 24, 2016 , ... Last week, Callan Capital, an integrated wealth management ... The Future of San Diego Life Science event at the Estancia La Jolla Resort ... the event with speakers Dr. Rich Heyman, former CEO of Aragon and Seragon, and ...
(Date:5/23/2016)... Zimmer Biomet Holdings, Inc. (NYSE and SIX: ZBH), ... Board of Directors has approved the payment of a quarterly ... The cash dividend of $0.24 per share ... stockholders of record as of the close of business on ... approval of the Board of Directors and may be adjusted ...
(Date:5/23/2016)... ... May 23, 2016 , ... Foresight Institute , ... the winners for the 2015 Foresight Institute Feynman Prizes. , These prestigious ... categories, one for experiment and the other for theory in nanotechnology. Prof. Markus ...
(Date:5/20/2016)... ... May 20, 2016 , ... Korean researchers say Manumycin A ... offer a new way to treat the disease. Surviving Mesothelioma has just posted an ... Scientists from several Korean institutions based their mesothelioma study on the fact the Manumycin ...
Breaking Biology Technology: