An analysis of your saliva can tell you your level of fatigue.
The levels of protein and the activity of the enzyme alfa-amilase in the saliva we can see how much tired we are.
Originally these tests were made for the sports world to control the level of fatigue of the athletes, but now they are being adopted by the brazilian police thanks to the help of the “Universidade Federal de Uberlândia” researchers at Brasil, to control the level of fatigue of the drivers.
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You can see your level of fatigue thru an analysis of your saliva with a simple kit.
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