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Lactate test made easy
Date:5/6/2009

Performance athletes need to know their blood lactate level. It indicates how much lactic acid has collected in their blood as a result of physical exertion and enables conclusions to be drawn about their fitness. Professional athletes therefore regularly have to attend performance diagnosis sessions. As they pedal a cycle ergometer at various levels of exertion, a doctor takes blood samples from an earlobe. A special device then measures the concentration of lactate in the blood.

Such scenarios will soon be a thing of the past. Using a miniaturized measuring system, performance and leisure athletes will in future be able to monitor their lactate readings themselves including during training. Normally the analytical devices are quite big and cost several thousand euros. "We have found a way of miniaturizing the measurement system so that it can be accommodated in an ear clip. The results could be radioed by the ear clip to a training wristwatch or a cellphone," says Thomas van den Boom, group manager at the Fraunhofer Institute for Microelectronic Circuits and Systems IMS in Duisburg. An electrochemical method is used to measure the lactate value. In a chemical reaction, an enzyme triggers a redox flow from the lactate which can be measured using electrodes. The measurement system, which could be installed for example in an ear clip, consists of two microchips: the innovative nanopotentiostat fits on a chip measuring just two by three millimeters and costs less than one euro. "The second chip incorporates microelectrodes which we have developed for this purpose and which we can couple with the nanopotentiostat," explains van den Boom. One of the microelectrodes is coated with a thin layer of gel containing the enzyme. There are altogether three microelectrodes on the chip, which are activated by the nanopotentiostat. Two serve the purpose of electrochemical measurement while the third keeps the electrochemical potential constant end thus ensures a s
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Contact: Thomas van den Boom
thomas.van.den.boom@ims.fraunhofer.de
49-203-378-3207
Fraunhofer-Gesellschaft
Source:Eurekalert  

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