New Biosensor Warns When Athletes are About to “Hit the Wall,” American Chemical Society Reveals

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A new biosensor, applied to the human skin like a temporary tattoo, can alert marathoners, competitive bikers and other “extreme” athletes that they’re about to “bonk,” or “hit the wall,” scientists are reporting. The study, in ACS’ journal Analytical Chemistry, describes the first human tests of the sensor, which also could help soldiers and others who engage in intense exercise -- and their trainers -- monitor stamina and fitness.

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