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Title
Japanese: 
English:Validation of Wearable Device Consisting of a Smart Shirt with Built-In Bioelectrodes and a Wireless Transmitter for Heart Rate Monitoring in Light to Moderate Physical Work 
Author
Japanese: Yuki Hashimoto, Rieko Sato, Kazuhiko Takagahara, Takako Ishihara, Kento Watanabe, Hiroyoshi Togo.  
English: Yuki Hashimoto, Rieko Sato, Kazuhiko Takagahara, Takako Ishihara, Kento Watanabe, Hiroyoshi Togo.  
Language English 
Journal/Book name
Japanese: 
English:Sensors 
Volume, Number, Page Vol. 22    No. 23   
Published date Nov. 28, 2022 
Publisher
Japanese: 
English:MDPI 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://www.mdpi.com/1424-8220/22/23/9241
 
DOI https://doi.org/10.3390/s22239241
Abstract Temperature elevation due to global warming increases the risks of dehydration, which can induce heat-related illness. Proper rehydration with appropriate amounts of water and electrolytes is essential to aid body fluid homeostasis. Wearable sweat sensors which can monitor both the sweat rate and sweat electrolyte concentration may be an effective tool for determining appropriate rehydration. Here, we developed a novel potentially wearable sensor that can monitor both the local sweat rate and sweat electrolyte concentration continuously. The new device includes a system with a short microfluidic pathway that guides the sweat appearing on the skin to a small space in the device to form a quantifiable droplet. The sweat rate is assessed from the time for the droplet to appear and droplet volume, while an integrated electric sensor detects the sodium chloride concentration in each sweat droplet. We demonstrated that this new device could record both the flow rates of artificial sweat and its sodium chloride concentration in ranges of human sweating with an accuracy within ±10%. This is equivalent to the accuracy of commercially available sweat rate meters and sweat ion sensors. The present study provides a new perspective for the design of wearable sensors that can continuously monitor sweat rates and sweat electrolyte concentrations for potential application to a healthcare device.

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