Tattoos to Measure Stamina

By integrating complex electrochemical sensors with simple, fairground tattoos, nanoengineers have created a highly sensitive, wearable biosensor that monitors electrolyte and metabolite levels in sweat to assess the metabolic health of a patient, and in particular, their stamina. The temporary electrochemical tattoo relies on a carbon fiber backbone so that it bends with the skin during normal activity without loss of functionality and a conductive polymer that is sensitive to pH-levels in sweat.