Printed Wearable Sweat Rate Sensor for Continuous <i>in-situ</i> Perspiration Measurement
Islam et al.
The finding, in our words
A printed, flexible sweat-rate sensor patch fabricated by 3D printing and microfluidics weighed only 380 mg and measured sweat rate capacitively with 0.01 μL/min sensitivity. On-body validation against commercial sensors showed accurate continuous monitoring, enabling decentralised assessment of hydration and heat tolerance for occupational safety and precision health.
A paraphrase to the Library’s standard, never the abstract. The source is one link away and is always the authority.
Wearable biochemical monitoring requires a complete measurement chain that integrates quality-controlled biofluid sampling, sensor fusion and metadata capture to convert raw sensor outputs into clinically valid digital biomarkers.
The wearable microfluidic sensor measured sweat cortisol across a range of 0.1 fM to 100 μM with a 0.043 fM detection limit. In human volunteers it tracked diurnal rhythms and stress-induced elevations from cold-pressor and exercise tests, showing agreement with ELISA, and combined with electromyography it profiled exercise fatigue by linking muscle activity to endocrine response.
Chen et al., Biosensors & bioelectronics (paywalled) · source ↗
This review assesses wearable sensors for the continuous biochemical monitoring of body fluids such as sweat, saliva and interstitial fluid, confirming their potential for decentralised healthcare through pilot trials. It emphasises that successful clinical translation depends on large-scale validation and the integration of ethical and sociocultural considerations.
This review establishes that microsampling across blood, saliva, urine and stool matrices offers validated workflows and regulatory recognition for human biomonitoring comparable to conventional methods. It finds that these decentralised approaches enhance participant acceptability and enable screening in remote or low-resource settings.
This narrative review finds that saliva is best suited to repeated neuroendocrine and metabolic measurements during exercise, sweat is most mature for electrolyte and sweat-rate monitoring with wearable compatibility, and exhaled breath offers access to volatile metabolism but remains instrumentally demanding. Each matrix requires matching to a defined clinical or exercise question with matrix-specific validation before translational use.