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Wearable Muscle Tension Sensors Know More Than What You Feel

July 2nd, 2008 Medgadget Editors Neurology

A collaboration of European engineers is working on minuscule muscle tension sensors that can be woven into fabric to provide real-time data taken from a person’s state of electrical excitation of the muscles.
From the statement issued by Fraunhofer-Institut für Zuverlässigkeit und Mikrointegration:

[The vest] consists of sensors woven into the fabric that register the electrical excitation of the muscle fibers, and thin conducting metallic fibers that pass the signals to an electronic analysis system. People’s muscle tension changes with their stress level – the greater the stress, the more likely the muscles are to produce a synchronous twitching effect. Though this is barely perceptible, the electrodes register the change. The idea of the sensor vest originated with biomedical scientists at the Catholic University of Leuven, Belgium, who needed an inconspicuous measuring tool for stress studies. Until then, they had affixed electrodes directly to their test subjects’ chests. But this itself induced stress, with the result that the tests delivered very little useful information. The new vest is designed to ensure a more relaxed test environment. The project members are exploring further potential applications such as a special vest for computer games. By selectively tensing the torso muscles, players could use the vest to control figures on the monitor and for instance burst their heroes’ chains and fetters. The vest could also contribute to safety at the workplace – perhaps ensuring that workers do not lift loads that are too heavy for them. And sports coaches could tell from the electronic vest whether athletes have reached their performance limits or still possess energy reserves.
”The most important requirement for everyday use is a robust electronic system,” says Torsten Linz of the Fraunhofer Institute for Reliability and Microintegration IZM in Berlin, the partner responsible for the “packaging”. The entire electronic system has to be resistant to water and perspiration. The electric conductors must not fray even after repeated laundry cycles, and the sensors must be no larger than buttons to ensure that the garment is comfortable. The IZM researchers have meanwhile developed stable metallic fibers, watertight connections and durable sensor buttons. Their task over the next few months will be to integrate the analysis electronics. The project partners have already demonstrated during field hockey training that the vest really works; it enabled players to choose the ideal moment for striking the ball and to hit it much further than usual.

We could envision such a technology being used for monitoring of chronic neuromuscular disorders, such as myasthenia gravis.
Press release: A vest to measure stress …
Flashback: Driving a Wheelchair with Your Shirt (Thanks for the tip Bill)

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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