A microfluidic sensor for human hydration level monitoring

Hoe, Yen Yi Germaine; Johari, Badrul Hisam; Ju, Meongkeun; Kim, Sangho; Kripesh, V.; Kang, Tae Goo

doi:10.1109/dsr.2011.6026879

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…The market for gas sensors is predicted to exceed USD 3 billion by 2027 [ 138 ]. There are innumerable applications for gas sensors ranging from environmental monitoring, wearable products, smart packaging of perishable food products, RFID tags and healthcare monitoring [ 110 , 139 , 140 , 141 , 142 , 143 , 144 ]. The motivation for making them flexible is to potentially increase the application areas of these sensors.…”

Section: Discussionmentioning

confidence: 99%

A Review of Inkjet Printed Graphene and Carbon Nanotubes Based Gas Sensors

Pandhi

Chandnani

Subbaraman

et al. 2020

Sensors

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Graphene and carbon nanotube (CNT)-based gas/vapor sensors have gained much traction for numerous applications over the last decade due to their excellent sensing performance at ambient conditions. Inkjet printing various forms of graphene (reduced graphene oxide or modified graphene) and CNT (single-wall nanotubes (SWNTs) or multiwall nanotubes (MWNTs)) nanomaterials allows fabrication onto flexible substrates which enable gas sensing applications in flexible electronics. This review focuses on their recent developments and provides an overview of the state-of-the-art in inkjet printing of graphene and CNT based sensors targeting gases, such as NO2, Cl2, CO2, NH3, and organic vapors. Moreover, this review presents the current enhancements and challenges of printing CNT and graphene-based gas/vapor sensors, the role of defects, and advanced printing techniques using these nanomaterials, while highlighting challenges in reliability and reproducibility. The future potential and outlook of this rapidly growing research are analyzed as well.

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Section: Discussionmentioning

confidence: 99%

A Review of Inkjet Printed Graphene and Carbon Nanotubes Based Gas Sensors

Pandhi

Chandnani

Subbaraman

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…Multiple types of wearable sensors have been used to estimate hydration status within research settings. For example, dehydration has been accurately estimated using sensors that analyze different biomarkers of sweat secretion or properties of the skin (e.g., temperature and impedance) that are correlated with hydration status [16][17][18]. Measuring changes in bodyweight is one of the most common means of assessing hydration status, primarily due to its simplicity and low cost [10,15,19].…”

Section: Introductionmentioning

confidence: 99%

Noninvasive Estimation of Hydration Status in Athletes Using Wearable Sensors and a Data-Driven Approach Based on Orthostatic Changes

Kamran

Frischknecht

et al. 2021

Sensors

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Dehydration beyond 2% bodyweight loss should be monitored to reduce the risk of heat-related injuries during exercise. However, assessments of hydration in athletic settings can be limited in their accuracy and accessibility. In this study, we sought to develop a data-driven noninvasive approach to measure hydration status, leveraging wearable sensors and normal orthostatic movements. Twenty participants (10 males, 25.0 ± 6.6 years; 10 females, 27.8 ± 4.3 years) completed two exercise sessions in a heated environment: one session was completed without fluid replacement. Before and after exercise, participants performed 12 postural movements that varied in length (up to 2 min). Logistic regression models were trained to estimate dehydration status given their heart rate responses to these postural movements. The area under the receiver operating characteristic curve (AUROC) was used to parameterize the model’s discriminative ability. Models achieved an AUROC of 0.79 (IQR: 0.75, 0.91) when discriminating 2% bodyweight loss. The AUROC for the longer supine-to-stand postural movements and shorter toe-touches were similar (0.89, IQR: 0.89, 1.00). Shorter orthostatic tests achieved similar accuracy to clinical tests. The findings suggest that data from wearable sensors can be used to accurately estimate mild dehydration in athletes. In practice, this method may provide an additional measurement for early intervention of severe dehydration.

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Ubiquitous Approach to Body Hydration Testing

Chin

Tisan

2015

2015 International Conference on Intelligent Environments

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A microfluidic sensor for human hydration level monitoring

Cited by 6 publications

References 5 publications

A Review of Inkjet Printed Graphene and Carbon Nanotubes Based Gas Sensors

A Review of Inkjet Printed Graphene and Carbon Nanotubes Based Gas Sensors

Noninvasive Estimation of Hydration Status in Athletes Using Wearable Sensors and a Data-Driven Approach Based on Orthostatic Changes

Ubiquitous Approach to Body Hydration Testing

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