Over the past year, wearable devices have become more commonplace thanks to the introduction of the but that’s not the final word in heart monitoring — measurements can become more accurate and continuous with sensors mounted elsewhere on your body. Now researchers at the University of Texas at Austin have a light, thin, and stretchable “electronic tattoo” that can be worn over your heart, simultaneously creating ECG and seismocardiograph (SCG) readings.

While lead researcher Nanshu Lu has been working on so-called e-tattoos for years, her team’s major new innovation has enabled a typically rigid SCG sensor to become super thin and stretchable, contouring to the wearer’s chest. The e-tattoos aren’t thick patches, instead using a conductive plastic material named polyvinylidene fluoride to achieve mere 28-micrometer thinness — that’s

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