medical

Cheap, Rugged, Sweat-Sensing Skin Patch Hints at Bloodless Testing

Sweat could be the next thing wearable devices sense to track your health, researchers say. A new microfluidic skin patch capable of collecting and analyzing sweat has survived tests that included a grueling 104-kilometer bike race. And the next-generation wearable device has attracted the attention of companies such as cosmetics giant L’Oreal and a major sports beverage maker—not to mention the U.S. military. It could even pave the way for a painfree, bloodless method of prescreening people for diabetes in the future, according to its inventors.

The flexible sweat sensor collects sweat in a tiny tubing system as it’s worn against the skin. Different sections of the sensor slowly change color as they react to different levels of certain chemicals found within sweat. Any smartphone with the right app can take a picture of the sweat sensor to automatically interpret the color changes and biochemistry of the sweat as certain health signs. To tests the device’s ruggedness, volunteers even wore the sweat sensor during a long-distance, outdoor bicycling race.