This little device could one day replace heart rate monitors.

The researchers behind it claim that it s the first flexible wearable device able to measure both electrical heart signals and biochemical markers while you work out.

Developed by a team from the University of California San Diego, the device is able to record an electrocardiogram of your heart s activity and levels of lactate, a chemical that correlates with physical exertion, at the same time.

The circuitry is printed on to a thin and flexible polyester sheet, with a small on-board chip used to beam the data to a nearby device using Bluetooth.

The team explains in Nature Communications that the biggest difficulty with creating such a device is ensuring that the signals being acquired don t interfere with each other.

Now, the team is going to investigate if the same device can be used to measure other vital signs.

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