Wearable Patch Monitors Exercise Efficiency

A stick-on patch able to analyze sweat to determine exercise efficiency can also warn users if they are putting themselves in danger. The patch is equipped with four reservoirs coated with a reagent that will change color when exposed to a particular chemical. The data is then analyzed by a companion app, which uses the smartphone’s camera to take a photo of the patch and translate the colors into concentrations.

https://news.northwestern.edu/stories/2016/11/researchers-develop-soft-microfluidic-lab-on-the-skin-for-sweat-analysis/

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