An on-skin platform for wireless monitoring of flow rate, cumulative loss and temperature of sweat in real time

Kyeongha Kwon, Jong Uk Kim, Yujun Deng, Siddharth R. Krishnan, Jungil Choi, Hokyung Jang, Kun Hyuck Lee, Chun Ju Su, Injae Yoo, Yixin Wu, Lindsay Lipschultz, Jae Hwan Kim, Ted S. Chung, Derek Wu, Yoonseok Park, Tae il Kim, Roozbeh Ghaffari, Stephen Lee, Yonggang Huang, John A. Rogers*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Monitoring the flow rate, cumulative loss and temperature of sweat can provide valuable physiological insights for the diagnosis of thermoregulatory disorders and illnesses related to heat stress. However, obtaining accurate, continuous estimates of these parameters with high temporal resolution remains challenging. Here, we report a platform that can wirelessly measure sweat rate, sweat loss and skin temperature in real time. The approach combines a short, straight fluid passage to capture sweat as it emerges from the skin with a flow sensor that is based on a thermal actuator and precision thermistors, and that is physically isolated from, but thermally coupled to, the sweat. The platform transfers data autonomously using a Bluetooth Low Energy system on a chip. Our approach can also be integrated with advanced microfluidic systems and colorimetric chemical reagents for the measurement of pH and the concentration of chloride, creatinine and glucose in sweat.

Original languageEnglish (US)
JournalNature Electronics
DOIs
StateAccepted/In press - 2021

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Electrical and Electronic Engineering

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